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You are here: Home / 4017 IC Circuits / 4 Simple Clap Switch Circuits [Tested]

4 Simple Clap Switch Circuits [Tested]

Last Updated on February 23, 2020 by Swagatam 191 Comments

The clap switch circuits explained here will toggle a connected load ON and OFF in response to alternate clap sounds? Here we discuss 4 unique and simple designs which can be selected as per user preference.

The article talks about what the title suggests – a clap switch. A small electronic circuit when built and integrated to any electrical appliance can be made to switch ON/OFF through mere hand clapping.

The proposed design when integrated to any of your electrical appliance can be used to switch it ON and OFF simply through alternate clapping of your hand. The device becomes more interesting and useful because it does not require any external mechanism or device to carry out the specified operations.

NOTE: An IC 555 circuit can never produce an alternate ON/OFF switching for the load. Instead they will work like monostables and switch ON the load only for sometime and then switch it OFF. So please stay away from cheap misleading circuits online.

Main Application Areas

The main application of the clap switch circuits described below is for controlling home appliances like light bulbs and fans.

Suppose you want to connect a ceiling fan with this circuit so that you can switch it ON or OFF with alternate clap sound, you can easily do it, by wiring the fan 220 V AC input through the relay of the circuit.

Similarly, if you wish to switch a tube light or any 220 V or 120 V AC lamp, just wire it in series with the relay of the clap switch.

The following image shows how to connect fan with the relay

Clap switch for switching fan ON OFF

The fan regulator can be connected anywhere in series with the wiring.

Any light bulb can be connected with the clap switch relay as given in the folowing figure

Clap switch with bulb light ON OFF

How Sound Vibrations Trigger the Circuit

As you must have noticed the clapping of hands creates a loud sound and is sharp enough to move quite a distance. The generated sound is in fact strong ripples or vibrations created due to the sudden compression of air in between our striking palms.

A mic is connected to the amplifier stage; the sound vibrations made by clapping hits the mic and get converted into tiny electrical vibrations. These electrical pulses are amplified to suitable levels by the transistors and are fed to the flip/flop.

The flip flop is a bistable relay circuit which switches ON/OFF the attached relay alternately in response to each clap sound.

The circuit presented here is basically made up of two stages, the first stage is a two transistor hi-gain amplifier and the second stage consists of an efficient flip/flop.

The flip/flop stage alternately switches the output relay driver in response to every subsequent clapping. The load connected to the relay thus also gets activated and deactivated correspondingly.

The circuit may be further understood with the following explanation.

1) Clap Switch Circuit Using IC 741.

clap switch circuit using IC 741 opamp

The above clap operated relay circuit was provided to me by one of the keen readers of this blog Mr. Dathan.

The circuit is very to understand:

The opamp here is configured as a comparator, meaning it is positioned to differentiate the slightest of voltage differences across its two inputs.

When the clap sound hits the mic, a momentary drop of voltage is experienced at pin#2 of the IC, this situation raises the voltage at pin#3 of the IC for that instant.

As we know, with pin#3 at higher potential than pin#2 makes the output of the IC high, the condition puts the output of the IC go high momentarily.

This high response triggers the IC 4017 pin#14, and forces its output to either move from pin#2 to pin#3 or vice versa depending upon the initial situation of the outputs.

The above action switches the load accordingly either to ON or OFF position.

The above 12 V clap triggered switch circuit using IC 741 was successfully tried and tested by Mr. Ajay Dussa. The following prototype images for the same were sent by Mr. Ajay.

clap switch tested prototype on breadboard
tested clap switch design on veroboard

The PCB design (track layout) for the above can be seen below, as designed by Mr. Ajay:

clap activated switch circuit PCB track side layout

2) Clap Switch Using Transistors or BJTs

In the above explanations we learned a simple clap activated switch circuit which incorporated an IC for implementing the desired ON/OFF toggling actions. The present design uses a different principle and utilizes only transistors for the above triggering actions.

simple transistorized clap switch circuit

Clap Switch Video Demonstration

Parts List

  • R1 = 5k6
  • R2 = 47k
  • R3 = 3M3
  • R4 = 33K
  • R5 = 330 OHMS
  • R6 = 2K2
  • R7 = 10K
  • R8 = 1K
  • R9, R10 = 10K
  • C1, C4 = 0.22uF
  • C2 = 1uF/25V
  • C3 = 10uF/25V
  • T1, T2, T4 = BC547
  • T3 = BC557
  • All IC diodes = 1N4148
  • Relay diode = 1N4007
  • IC = 4017
  • Relay = 12v / 400 ohms

How it Works

The figure above shows a straight forward two stage sound activated switch.

The first stage comprising T1, T2, and  T3 forms a hi-gain common emitter amplifier configuration.

A mic is connected at the base of T1 via blocking capacitor C1.

Strong sound vibration hitting the mic is instantly picked and converted into tiny electrical pulses.

These are in fact small AC pulses easily make there way through C1 into the base of T1.

This creates a kind of push-pull effect and T1 also conducts in the corresponding way.

However the response of T1 is relatively weak and requires further amplification.

Transistors T2/T3 are introduced exactly for this and help to improve the voltage peaks created by T1 to appreciable levels (almost equal to the supply voltage.)

The above voltage pulse is now ready to be use for toggling the relay ON/OFF and is fed to the relevant stage.

IC 4017 as we all know produces sequential shifting of its output pin-outs (logic high) in response to every positive pulse at its clock input pin 14.

The amplified clap sound voltage pulse is applied to pin 14 of the above IC, this flips the output of the IC to either a logic high or a logic low depending upon the initial status of the relevant pin-out.

This triggered output is appropriately collected at the diode junctions abd used to toggle a relay through a relay driver transistor T4.

The relay contacts ultimately goes to a load or an appliance which is correspondingly switched ON and OFF with every subsequent claps.

Using BJTs and Power Supply

Looking at the circuit diagram we see that the entire circuit has been configured around ordinary general purpose transistors.

The functioning of the circuit may be understood with the following points:

Transformer X1 along with the D1 and the capacitor C4 forms the basic power supply circuit for providing the required power to the circuit.

The first stage which includes R1, C1, R2, R3, R4 and Q1 form the input sensor circuit.

The next corresponding stages consisting of Q2 and C3 form the flip flop stage and makes sure that the signals from the input sensor stage is appropriately converted into alternate toggling of the output.

The output stage consists of a single transistor Q4. It is basically configured as a relay driver stage for translating the alternate ON/OFF actions from the previous stage into physical toggling of the connected load across the relay terminals.

The design is very old, I built it in my school days by assembling a kit. The circuit diagram using transistors is shown in below:

clap switch circuit using transistors with flip flop

Parts List

  • R1 - 15K
  • R2,R5,R12- 2m2
  • R10, R3 -270K
  • R4 - 3K3
  • R6 - 27K
  • R7,R11 - IK5
  • R8,R9 - 10K
  • R13 - 2K2
  • C3, C1 - 10KPF Disc
  • C2,3 - 47KPF Disc.:
  • C4 - 1000uF/16V;
  • Q1,2,3,4 - BC547B
  • D1 - 1N4007
  • D2,3,4,5 -1N4148 _
  • Xl - 12V/300mA Transformer .
  • MIC - Condenscr Mic
  • RLY — 12V Single Charge over relay

Another version of the above can be seen in the following diagram:

3) Double Clap-Clap Switch Circuit

All the clap-on switch circuits explained above have the ability to operate only with single alternate clap sounds. This feature makes the circuit vulnerable to external sounds which might occur occasionally triggering the connected load with the circuit.

A double clap operated circuit thus becomes more suitable and resistant to spurious triggering due to the fact that it would toggle only in response to two subsequent clap sounds instead of one.

The explained circuit is simple yet effective and does not employ microntrollers for the implementation unlike other circuits on the net.

The circuit has been tested by me, but it is a fairly complex design it's important to first understand the stages convincingly, and then build it to avoid failures.

Circuit Operation

The proposed clap-clap circuit or double clap circuit functioning may be understood with the following points:

The lower stage is basically a simple sound activated switch circuit which would activate with any loud sound.

The IC 741 is rigged like a comparator with its pin#2 referenced at some optimal fixed potential determined by  the setting of the given preset VR1.

Pin#3 of the IC becomes the sensing input of the IC and is connected with a sensitive mic.

The adjoining IC 4017 is a bistable stage which activates the connected relay driver stage and the load alternately in response to every positive high pulse at its pin#14.

When  a loud sound such as a "clap" hits the mic, it momentarily grounds pin#2 of the IC741 resulting in a momentary high pulse at its pin#6.

If we connected this output to pin#14 of IC4017 would have resulted in an instant toggling of the load with every single sound input which we don't want here to happen, therefore the response at pin#6 of  IC741 is broken and diverted to an IC 555 monostable stage.

How IC 555 is Configured

The IC 555 circuit is rigged in such a way that when its pin#2 is grounded, its output pin#3 becomes momentarily high for some period of time depending upon the values of the 10uF capacitor.

When a sound hits the mic, the high pulse from IC741 output triggers the BC547 attached to pin2 of IC555 which momentarily grounds pin#2 of IC555, which in turn put its pin#3 high.

However the instantaneous high at pin#3 of IC555 takes a while to reach the connected BC547 due to the presence of the 33uF capacitor.

By the time the 33uF charges and switches ON the transistor, the potential at the collector of the transistor is already gone due the absence of the clap sound which happens only momentarily.

However with the application of the immediate subsequent clap provides the required potential at the collector of the transistor which is now allowed to the reach pin#14 of the IC 4017.

Once this happens the relay driver triggers or deactivates depending upon its initial condition.

The toggling of the load thus takes place only in response to a pair of clap of sounds making the circuit reasonably foolpoof.

double clap clap activated switch circuit



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About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

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  1. Search Related Posts for Commenting

  2. Lawal Mohammed says

    Please Sir could you guide me to use it as a final year project work?I needed a clapswitch to be made with a password such that only the owner have access to use it.

    Reply
    • Swagatam says

      Lawal, how would you use the password with the clap switch?

      Reply
      • Lawal Mohammed says

        Please Sir, I assume by combining a four
        output clapswitch with a four key password switch, with the clapswitch changing its outputs with upon a single clap and each changing output activates the password switch. The password switch are numbered in a written form .So by varying the number of claps to activates each of the different
        four keys of the password switch, for example 2,4,1 and 3 orderly but successive number of claps needed to activate the four keys of the password switch to activate the clapswitch

        Reply
        • Swagatam says

          It is possible but will require 4no IC 4017, and 4 small SCRs, and other parts.

          Reply
  3. Malphas says

    Hi,
    I’m trying to make a bass drum flash (a 230v 30wLED that lights up only when i hit the drum and then turns off) is it possible to do this with a piezo transducer and a solid state relay? As follows:
    —— -12vDC —>|———–|| | S.S.R.|
    —— +12vDC—>|———–|<——————-• L
    Am i missing anything?
    I am awaiting your answer.
    Thank you for your time!

    Reply
    • Swagatam says

      Hi, it is possible, but the solid state relay is not required, instead a transistor driver will be enough:
      stick activated drum LED light

      Reply
  4. Ndukwe Prince says

    hi, sir i designed the second circuit which requires transistors… i assembled all component on my Vero board, i’m using a 9v battery with a 12v relay. my problem is once my circuit comes on, my LED come on too and if i make a clap it doesnt go off, pls sir i need a response to why its not responding and i’m connecting directly to my 240v light blud.
    i would be glad if you reply me
    thanks

    Reply
    • Swagatam says

      Hi, as you can see in the video the circuit works perfectly and there’s hardly anything complex in the second design.
      You can remove C2 and check the response again….C2 is for delaying the switching OFF action of the relay and the load.

      Reply
      • Ndukwe Prince says

        thank you sir, but i have one more question. is it necessary for the led on circuit board to turn off when you clap?

        Reply
        • Swagatam says

          The LED must turn ON momentarily when you clap…please see the response of the red LED in the video

          Reply
          • Ndukwe Prince says

            Mine is comes ON, when i attach my 9volt battery. And if i clap i won’t go OFF.
            Is there an adjustment i need to make

            Reply
  5. Samuel says

    Although impressive thumbs up, but it seems that 4017 can be removed from this circuit without losing the 2 clap on – 2clap off function. Don t u think so ?

    Reply
    • Swagatam says

      Thank you! without 4017 the output will not lock ON/OFF, it will be momentarily ON and then switch OFF

      Reply
  6. Trishpota says

    Dear swagatam
    Double clap switch is working from circuit’s near.What can i use about improving distance for mic?(I adjust trimpot) Is mic amplifier just enough?

    Reply
    • Swagatam says

      Glad you could make it successfully. You can try the transistor circuit and replace the 741 circuit with it. Use the T3 collector to feed the transistors of the IC 555 monostable. Ignore the relay at T3 collector

      Reply
      • Trishpota says

        It works but very sensitive i want adjust sensitive what should i do?(using pot?where?) i tried extended charging time(using 47uf it gains to me 2m 30sec ,4.7uf gains 15sec)

        Reply
        • Swagatam says

          You can try adjusting (increasing) the series resistor which is connected between the MIC and the positive supply

          Reply
  7. Danquah says

    Have you tested the double clap switch….my is not working…

    Reply
    • Swagatam says

      It will work, if you do it patiently and stagewise. You will have to separate the upper and lower stages, and test them separately, also you will have to connect a few LEDs across some specified points which will provide you with a clear indication regarding the sequential operations, and help you to optimize the timing for the two claps….possibly I may update the modified diagram soon

      Reply
  8. Sherwin Baptista says

    Hello sir,
    To be more precise,
    1. On idle, the circuit when powered, must keep the load shut until we clap.
    2. Upon a single clap, the clap switch circuit should respond but should hold the relay ‘ON’ and the load should operate without interruption.
    3. Now, by clapping again, the load must not go off rather we will manually shut the load off using a switch against the load.

    This circuit is a bit different in operation, i have stressed on “by clapping again, the load must not go off” please keep this in mind.
    I hope you understood now requesting you to help me.

    Thanks

    Reply
    • Swagatam says

      Hello Sherwin, guess why I told you to add the 1K resistor for C2? It is to latch the relay on the first clap, and I also suggested that to reset the circuit you must short the emitter/collector of T1.

      So it is exactly as per your requirement.

      Reply
  9. Sherwin Baptista says

    Good morning Sir Swagatam,
    One small request, could you please link me to the page of a particular clap switch circuit where,
    1. upon a single clap the clap switch circuit responds and the load operates.
    2. to switch off the load, we will manually control an on/off switch.

    I hope you understood, i want a one way clap switch circuit which only will trigger the load (ON) one upon a single clap action and to switch off the load we will physically control the switch to (OFF).

    Please do help me with the appropriate circuit,
    Thanks,

    Reply
    • Swagatam says

      Hi Sherwin, you can try the first circuit from this article:

      https://www.homemade-circuits.com/simplest-sound-activated-relay-switch/

      just replace C2 with a 1K resistor.

      Reply
      • Swagatam says

        ..to reset short the collector/emitter of T1 manually

        Reply
  10. Arnold Engineer says

    Hi sir. I made the 1st circuit using IC 741 but i doest work. I only connect two pin of VR1 1k. Is it correct? I cant fine the problem. Plss help me. I can send you my circuit photo if you want. Plss reply ser

    Reply
    • Swagatam says

      Hi Arnold, it is a straightforward design and will work. You can use two pins of the pot, but the center lead of the pot is compulsory among the two leads.

      I would recommend a preset and not a pot because adjusting a pot can’t be accurate.

      You just have to adjust the preset such that the voltage at pin3 of the op amp is slightly lower than the voltage at pin2. You can also a add a red LED in series with R4 to check the output response from the op amp to clap sounds

      Reply
  11. Elias - Brazil says

    I would like to thank you for clap circuit 1). I am a hobbyst and tested it. As I had lm301 used instead 741. Please inform if lm 301 can be used without any other changes in components.
    Rgds

    Reply
    • Swagatam says

      Thank you, yes it can be used, in fact any op amp or comparator IC will work here!

      Reply
  12. Francis says

    Hi Sir my name is Francis
    Having combined the first circuit With 1 microfarad capacitor to pin 4 and ground, 10K resistor in series to pin 6 and 14, 10K resistor in series to pin 4 and 15 and 0.22 microfarad 50V capacitor to pin 15 and positive.
    How much current does the circuit use?

    Reply
    • Swagatam says

      Hi Francis, the circuit may consume 10 to 15mA when idle, and upto 50mA while the relay is operational.

      Reply
      • Francis says

        1.Sir how can i further increase the sensitivity of the mic and can i use two micro phones or ill need to add or remove a component

        2.Sir all the components plus the new new resistors and the capacitors plus the relay.maximum current is 50mA. Can a use a 9v1A power supply or any other please advise!

        Thank You

        Reply
        • Swagatam says

          You can tweak R1 value to adjust the sensitivity of the circuit.

          You can connect two MICs in parallel.

          you can use 9V 1 A supply, just make sure the relay is also rated to work with 9V

          Reply
          • Francis says

            1. Sir if I’ll use two microphones do i need to change the value of the variable resistor?
            2. Sir I tested the first circuit with the given components but the LED (ON) connected to the transistor would light first instead of the other LED (OFF). If I add a 1uF/25V, 0.22uF/50V and two 10K resistors just as you’ve explained to someone else above this problem will be solved? Please advise…
            Thank you

            Reply
            • Swagatam says

              Francis, for two mics also the circuit will remain the same.

              Which two LEDs are you referring to, I can see only one LED in the first diagram?? Where did you connect them?

  13. Hobbyman says

    I tried everything but it doesnt seem to work
    i think the transistor circuit works perfectly
    coz the LED goes off after 2 seconds
    but the relay doesnt seem to work
    what could be the problem? which part of the 4017 circuit is important for the relay? i mean which parts do i need to check first?

    Reply
    • Swagatam says

      I hope you have built the 4017 exactly as shown, with the 1N4148 diodes?

      OK, now connect an LEd in series with the base of the relay transistor. This will quickly tell you whether the signal from the IC 4017 is correctly reaching the relay transistor or not. If the LED switches ON OFF but the relay doesn’t will mean the transistor is faulty. If the LED does not respond, short circuit the emitter/base of the relay transistor and check again, if now the LED responds then again it will prove the transistor is faulty.

      I can’t anticipate any other fault right now, except if the IC 4017 itself is faulty,

      Reply
  14. electron says

    Hi there
    I could not find a bc547 in the market
    i know its very common..its strange it wasnt available
    anyway what is the best sub for it? i have plastic 2n2222 , bc546, bc 548 and bc 549
    among these which one do u suggest?

    Reply
    • Swagatam says

      He electron, You can use BC546 which looks most appropriate among the mentioned devices.

      Reply
      • Nikolas says

        Hello sir
        How you doin?
        I have a question
        How much mA does the second circuit need to work?

        Reply
        • Swagatam says

          Hello Nikolas, it will consume around 5 mA when the relay is not active, and around 50mA when active (or depending on relay specs.)

          Reply
    • manushifin says

      in reply to “Both will work, you can use any one of them”

      yes but which one would u suggest?a 2.2k pot or a 4.7k pot?

      Reply
      • Swagatam says

        There will be no noticeable difference in the response, so I don’t have any specific suggestion, you can use the one which is available with you.

        Reply
    • Hobbyman says

      I just built this circuit
      I used a 12v adapter as the supply
      When I whistle the leds turns on and it goes off once I stop whistling
      Also the 12v relay does not seem to turn on and off
      I know there’s something wrong
      I just don’t know what
      Can you help me plz?

      Reply
      • Swagatam says

        It won’t respond correctly to whistle sound, it is designed to respond to low frequency loud sounds, like a clap sound.

        You can try momentarily bypassing the emitter/collector of T3, and check if the relay responds or not. If it doesn’t respond then your 4017 circuit may be having problems, which you’ll need you troubleshoot by examining the connections

        Reply
        • Hobbyman says

          What if I’m the relay responded when I connect the e and c of t3?

          Reply
        • Hobbyman says

          Wait please ignore my last message
          I didn’t get what you mean by bypassing the emitter or the collector of T3
          U mean connecting base to emitter? Or collector to emitter

          Reply
          • Swagatam says

            it’s emitter and collector, not base….in other words Connect pin14 of IC 4017 with positive line momentarily, tapping it alternately should click the ON/OFF

            Reply
  15. Hobbyman says

    the second circuit as you said has more sensitivity. but i cant see a pot on it
    i wish there was a pot so that we could adjust the sensitivity

    Reply
    • Swagatam says

      you can use a pot for R6 or controlling sensitivity.

      Reply
      • Hobbyman says

        THANKS A BUNCH
        A 2.2k pot?

        Reply
        • Swagatam says

          It will do, connect the center terminal with the base of the transistor.

          Reply
          • manushifin says

            should I use a 2.2 pot or a 4.7? which one works better sir?

            Reply
            • Swagatam says

              Both will work, you can use any one of them

      • Hobbyman says

        is the positive of c2 connected to r4 or it is a jump?

        Reply
        • Swagatam says

          It is a jump, connected only to T2/R5…you can remove C2 because it will create a delay OFF on the load

          Reply
          • Hobbyman says

            C2 the 1uf cap? So if I remove the 1uf cap the relay will go off once I clap?

            Reply
            • Swagatam says

              yes, if you remove C2, relay will quickly respond to your claps, if C2 is included, you will have to pause for 2 seconds between each clap.

  16. Stephi says

    Hi.I want to make the first circuit
    To get more safety Im planning to use a fuse for my 9v 300mA power supply.what fuse amperage do I need? 0.5a fuse or 0.3 or…? can I even use 1.6A fuse? will it cut the AC if the power supply is shortened?

    Reply
    • Swagatam says

      Hi, a fuse is actually not required, and the chance of your power supply getting shorted is almost zero. Still if you are interested you can put one on the AC side of the power supply, the rating will depend on the load or appliance that you connect with the relay contacts. If it’s a 0.5 amp lamp then the fuse could be rated at 1 amp and so on.

      Reply
  17. unknown says

    hi sir…i really like your website
    i always come here for %100 working circuits
    i have a question about the circuit above
    the first circuit
    what is a good replacement for the 741 ic
    i have TL081, TL061,TL071
    Ive heard that the TL071 opamp is a low noise amp which i think does affect the circuit’s sensitivity right? but i dont know for sure if it can be replaced with 741 with no problem
    the reason im looking for a replacement is i could not find a 741 ic at store

    Reply
    • Swagatam says

      Thanks oppa, I,m glad you liked my site!

      You can actually use any op amp for this application. The low noise characteristic is not relevant to this application, since it is used only as a basic comparator, so basically you can use any op amp here, all will work

      Reply
  18. leesquin says

    single clap circuit work flawlessly. I can adjust the sensitivity by ajdusting the pot or the aupply voltage.

    Reply
    • Swag says

      that’s great, I am glad it’s working!!

      Reply
      • Hobbyman says

        hello sir
        i am very interested in this project
        i want to make this circuit for my bedroom light…can u plz tell me which circuit has more range and sensitivity?
        and about the second circuit…can i supply it with 9 volt power supply and replace the 12v relay with a 9v one?
        the 4th circuit looks nice.. does it work properly? no offence…in my country these components are expensive

        Reply
        • Swagatam says

          Thanks Hobbyman,

          The second circuit seems to have the longest range and high sensitivity. Yes it can be used with a 9V power supply and relay.

          The 4rth circuit is yet to be tested but I am sure it will work once everything is adjusted perfectly.

          Reply
          • Hobbyman says

            Ok sir thank you
            So in the second circuit, I can use 9v supply and 9v relay or 9v supply and 6v relay?
            I’ll be back soon with a pcb so that it users who would prefer a pcb can use it
            And I saw u said something about adding a 0.22 cap across pin 3 and 6 in order to get extra sensitivity, should I add it to my pcb?

            Reply
            • Swagatam says

              Hobbyman, I referred to this circuit not the first one:

              https://www.homemade-circuits.com/wp-content/uploads/2018/08/clap-switch.jpg

              This circuit is more sensitive.

              For 9V supply you must use a 9V relay, not a 6V relay

  19. vishnu says

    hai Iam vishnu, sir I bulid a clap circuit using Bc547transistors without any Ic their are 3 transistor of Bc 547 and1transistor BAc368 without relay my circuit is completely worked first after some type it is not detect sound instead when we touch mic the LED wil ON&OFF .

    Reply
    • Swag says

      Vishnu, if you have built it on a breadboard then possibly there could be a loose contact somewhere, otherwise one of your transistors could have gone bad…BC547 are rated at minimum 60V so those may be fine but BC368 is rated at 20V only so may be you could test this transistor….and if you are using a relay make sure to use a freewheeling diode across the relay coil

      Reply
  20. Yanniverse says

    I tried doing this project in breadboard but it doesn’t respond to my clap or any sound i made. the LED only lit, that’s it. what can be the possible problem in this one? I hope i could get a quick response, it is for our electronics project. Thank you and good day!

    Reply
    • Swag says

      first of all recheck all the connections, because breadboard are always prone to mistakes and loose connections.

      if possible remake it on a veroboard by practical soldering.

      If you are referring to the last circuit, remember the preset has to be adjusted carefully to get the results, otherwise the circuit won’t respond.

      for testing the IC 741 response, remove the LED/resistor from the IC 4017 pin#3 and connect it across pin#6/ground of the IC 741.
      Now after careful adjustment of the preset you should be able to see this LED becoming momentarily ON on each clap sounds.

      Reply
  21. aiwin anil says

    YES IT WORKED,after a long time.Thank u for your instant reply.It is only because of your fast reply i could make it successfully.Now i have to make another project-amplifier circuit.Please suggest any website for this project which uses an ic,condenser mic and a 8ohm speaker(or any small speaker).

    Reply
    • Swagatam says

      I am glad to know it worked…congrats on that!

      for MIC amplifier you can try the last diagram as given in the following article

      https://homemade-circuits.com/2012/08/ic-lm-386-datasheet-explained-in-simple.html

      Reply
  22. aiwin anil says

    I made it but when i connect the power supply,8050transistor near the diodes is getting heated and the circuit is not working.Please tell me where is the problem in my circuit.I have used the first circuit.

    Reply
    • Swagatam says

      In the first circuit it's BC547 near the relay, anyway even if 8050 is used it should not become hot…unless the relay coil is shorted, or you have done something seriously wrong with the connections.

      make sure you have connected the transistor pinouts correctly.

      Reply
  23. daktei says

    Can i power the second circuit with a 12v supply?

    Reply
    • Swagatam says

      yes you can

      Reply
    • aiwin anil says

      If i connect the relay to an appliance and clap will the applianceremain turned on untill i clap again.
      Thanks in regards.

      Reply
    • Swagatam says

      yes, the appliance will remain switched in the same position until the next clap is made….

      Reply
    • aiwin anil says

      For the first circuit or second or will both the circuits work in the same way as you have replied above.
      Thanks in advance.

      Reply
    • Swagatam says

      yes that's right, because both have flip flop stage…

      Reply
  24. Prashant Medhekar says

    sir, as u said to connect 10k at pin 4 n 15 of ic 4017 and capacitor to pin 15 and +vcc .
    the circuit work correctly as led at pin no 3 of ic 4017 glow before clap and after clap the led connected to transistor glow, but this happen only one time, after that circuit stop working none of led glow, now what should i do?

    Reply
    • Swagatam says

      Prashant, you can try putting a resistor 10K in series between pin#6 of IC 741 and pin#14 of IC4017, and connect a 1uF/25V capacitor across pin#14 and ground.

      also for better reliability configure the output of the 4017 exactly as done in the first diagram.

      Reply
  25. Prashant Medhekar says

    can can u tell me the exact value of pot for perfect result?

    Reply
  26. Terminator says

    Sir can you tell me that we can use this circuit to automatically open the door??

    Reply
  27. Terminator says

    Sir can you tell me that can we use this circuit to automatically open and close the door??? Please reply as soon as possible.
    If yes then how?? What changes should be made in the circuit??? I have to submit a project proposal and my project is "automatic door opening using clap switch" and the circuit should work from the minimum distance of 8 feet.
    Please help me…!!!!
    The door is not of the full size. There is a mechanical model of wood of almost 1 feet tall.

    Reply
  28. Prashant Medhekar says

    sir, when i apply 9v to the circuit which led sholud glow by default i.e.before clap, the one which is connected to pin no3 of ic 4017 or the led connected to transistor

    Reply
    • Swagatam says

      pin#3 LED should light up… but sometimes it might not because the logic high might disappear across one of the other outputs of the IC 4017….so to prevent this please connect a 10K resistor between pin#15 and pin#4…and also connect a 0.22uF capacitor from pin#15 to the positive rail.

      Reply
  29. manjunath says

    sir any minor changes can made to second circuit that lead to more sensitive and responce small sound genarated by clap. now I was still struggling to adjust 1k preset as you said above. thanks

    Reply
    • Swagatam says

      you can try connecting a small value capacitor across pin6 ans pin3….this should improve the sensitivity of the circuit manyfolds

      still the 1K perset adjustment will be crucial.

      Reply
    • manjunath says

      sir small value capacitor means which capacitor can i use and does it has polarity

      Reply
    • Swagatam says

      preferably it should be non-polar…you can try a 0.22uF, or a 0.33uF etc

      Reply
    • manjunath says

      sir i bought 0.22uf capacitor but it has polarity then which side to connect #pin 3 and #pin 6 ( #pin 3 positive and #pin 6 negetive . may i correct)
      and was this 0.22uf capacitor to connect IC 741
      thanks

      Reply
    • Swagatam says

      Manjunath, you can connect positive to pin6 and negative to pin3, but a non-polar would have worked better…I thought you would bring a ceramic disc type capacitor.

      Reply
    • manjunath says

      sir sorry to say that, i connected non-polar 0.22uf to the ic741 . but it was still not working perfectly even though i adujust 1k . which stage may be faulty as per your knowladge thank you very much sir

      Reply
    • Swagatam says

      can't say exactly, your MIC could be faulty or assembled with wrong polarity or the IC may be faulty or with wrong connections…
      when you clap the MIC grounds the pin2 of the IC momentarily which causes the pin3 and pin6 to go high, this the basic working principle of the circuit, you can confirm whether this is happening or not.

      Reply
  30. manjunath says

    SIR I MADE THE SECOND CIRCUIT BUT SEEMS IT WAS NOT SENSING ACCURETLY. AS YOU SAID IT WAS NOT SENSING ABOUT 10 FEET DISTENCE .I SHOULD TOO NEAR TO THE MIC ,THAT ALSO NOT SENSING PROPERLY.
    WAS THE FIRST CIRCUIT WAS MORE ACCURATE THAN THE SECOND PLEASE HELP ME
    THANKS

    Reply
    • Swagatam says

      Manjunath, you will need to adjust the 1K preset precisely for getting a proper response from the cirucit.

      Initially, make sure the output of the IC just merely turns "low" (0V), by adjusting the 1K preset.

      Thia will set-up the circuit optimally and claps from a little distance will also become responsive

      this circuit is better than the first one.

      Reply
  31. manjunath says

    Sir in second diagram where to connect VR1 as it contains 3 pins (the printed side facing us right side pin is negative, center pin is out, and right side is positive.) as per your diagram two pins are connected. Please help regarding this thank you.

    Reply
    • Swagatam says

      Manjunath, VR1 here should be a preset not a pot, and by the way presets and pots do not have polarity, so the orientation is not critical.

      you can use the center pin and any one of the outer pins, and leave the other pin free (unused)

      Reply
  32. Prashant Medhekar says

    hey what different thing can we use instead of led??
    and use of relay is complusory??

    Reply
    • Swagatam says

      LED is used for indicating the clap response, it cannot e replaced by anyuthing else.

      the relay is for switching a load ON/OFF in response to the claps…

      Reply
  33. Shirish Srivastava says

    Hi swagatam ,I made a clap switch it's different from what you have posted here but works the same way. I want to Decrease it's sensitivity to make it a bit practical.

    I was wondering if I could add a pot in series with the mic,will it help ?

    Reply
    • Swagatam says

      Hi Shirish, yes you can put a pot or a preset in series with "R1" and adjust it appropriately for the required level of sensitivity.

      Reply
  34. Unknown says

    I did and did not work the first circuit.
    Can you give me an idea of what is not.

    Reply
    • Swagatam says

      you can try the second opamp circuit or the one which is shown in the following article:

      https://homemade-circuits.com/2012/04/simple-clap-switch-circuit-using-only.html

      Reply
  35. Anirudh Bhat says

    Dear sir,
    I tried out the clap switch which turns on for two claps as suggested by you. But it is not working. Could you please tell me what's the problem?

    Reply
    • Swagatam says

      Dear Anirudh, I'll try to update the article with a new easier one soon, you can try that once it's posted

      Reply
  36. rolando jumaoas says

    why the collector in transistor is in the ground in the pcb layout?

    Reply
    • Swagatam says

      It is a "component side view" layout

      Reply
  37. Anirudh Bhat says

    Sir, could you please tell me how to design a clap switch which turns on for 2 claps and turns off for one clap?

    Reply
    • Swagatam says

      Anirudh, I have the circuit posted in the following article:

      https://homemade-circuits.com/2013/04/clap-clap-switch-circuit-double-clap.html

      but it will switch off also with two claps

      Reply
    • Anirudh Bhat says

      Thanks a lot for your time and help sir.
      If it's not a problem could you please tell me how to turn it off for a single clap?
      Thank you again sir.

      Reply
    • Swagatam says

      Anirudhs, the linked circuit is designed to work with two claps (ON/OFF), to make it operate with a single clap switch-OFF will require a complete change in the configuration and will make the design much complex….so it is not advisable to do so, moreover a single clap will make the design vulnerable to ambient noise.

      Reply
  38. lorenz pango says

    Hello, I would like to use this circuit as a school project (toy car) using a 9v battery. How do I exactly do that and also, I already bought all the parts and a 9V motor and a 9V battery

    Reply
    • Swagatam says

      Hi, you can try the IC 741 circuit, however it'll need to be tweaked appropriately for getting the most optimal results

      Reply
  39. Affaizal Faiz says

    Hey, iam from indonesian, i want to ask question, look over the PCB according to the first pat sensor circuit or the second ? ( clap simple switch that was given to me by one of the readers of this blog Mr. Dathan sharp . )

    Reply
    • Swagatam says

      the PCB design is for the second circuit…

      Reply
  40. harishvar akaash says

    Hello Mr.Swagatam ……I have a minor problem…i made mr.ajay's circuit….but the problem is the sensitivity of the mic….the sensitivity of the mic is very low…it doesn't even responds from 0.5 feet…plzz tell how could i increase the range of mic to the extreme level….. i will be thankful for your quick reply…

    Reply
    • Swagatam says

      hello harishwar, try a 10k preset in place of the shown 1K, and adjust it carefully to achieve the required sensitivity….hopefully this should solve the issue, other wise we may have to seek other options.

      Reply
  41. harishvar akaash says

    hello Mr. Swagatam Majumdar……

    plzz sort out my problem as soon as possible…..
    i made mr.ajay's circuit …it works perfectly but the main problem is the sensitivity of the mic….plzz tell how can i increase the range of mic to the extreme level…. i need the mic to work at least at the range of 5m….if its not possible…what is the maximum range of the mic….waht modifications should i do in the circuit…. plzz reply

    Reply
  42. Kristian Tot says

    you mean i should make the first schematic?

    Reply
    • Swagatam says

      no, not the whole circuit, replicate only the diode section which are connected to pins 2,7,1,6,11 of the IC4017, make sure that now pin15 is connected to ground.

      Reply
    • Kristian Tot says

      Just finised that but now not even the rel led doesen't turn on

      Reply
    • Swagatam says

      connect one LED in series with R4 also and check its response, if this LEd lights up very brightly will ensure a proper functioning of the 741 section….then you can only replace the 4017 IC and recheck.

      Reply
  43. Kristian Tot says

    nope it doesen't work. i mean the relay doesent turn on. However i measure the voltage between the colector and the postivie voltage supply and it;s about 3V volt's.

    Reply
    • Swagatam says

      it means your IC 4017 is not responding, may be it's faulty, put diodes at the output of the 4017 as shown in the first diagram and do the connections accordingly for the relay and the transistor also…..try it before discarding the IC.

      Reply
  44. Kristian Tot says

    I have made the circuit but my led's just blink when i clap. Could that be the foult of the CD4017 chip?

    Reply
    • Swagatam says

      yes it could be, before concluding do a modification, connect a 10uF capacitor parallel with R4 and check again.

      Reply
    • Kristian Tot says

      I don't have a 10uF capacitor and the stores are all closed for the next few days, will a 22uF work?

      Reply
    • Swagatam says

      22uF will also work, you can use it.

      Reply
    • Kristian Tot says

      Iave placed the capacitor and it it's working better but not like it's suposed to. Sometimes it just starts to blink and it doesen't stop and when i place the relay it just turns off. I have relapced the cd4017 chip with another and insead of a pot i used a 1kohm resistor which i now replaced with a 470ohm resistor and now it's just worse.

      Reply
    • Swagatam says

      the pot is required so that the sensitivity and optimal working from the IC741 can be adjusted and ensured, if you remove it you would be unable to do the above settings

      the 4017 seems to be not functioning correctly…you may need to check it separately.

      break the link between pin6 of 741 IC and pin14 of 4017 but do not remove R4 and the parallel capacitor from pin14.

      Now manually touch pin14 to positive with a piece of wire, the relay should respond with an alternate ON/OFF sequence..this would confirm a good 4017 otherwise some other fault could be suspected.

      Reply
  45. Kristian Tot says

    Could you post the pcb layout in the real size?

    Reply
    • Swagatam says

      provide the shown PCB design to the PCB maker, he'll do the rest.

      Reply
  46. Kristian Tot says

    What is the 1K POT used for?

    Reply
    • Swagatam says

      for adjusting the sensitivity

      Reply
  47. Kristian Tot says

    Does the mic have polarity? And the relay is 12V ?

    Reply
    • Swagatam says

      yes MIC has a polarity, check its pins, the one which is isolated from the body ground track is the positive and will go to the IC input pin2, relay voltage must be equal to the supply voltage

      Reply
  48. Kristian Tot says

    What's the exact name of the IC714? I can't find it in any store in mu country by the name 714 or IC714.

    Reply
    • Swagatam says

      It's IC 741 not 714

      Just ask for "IC 741" or "opamp IC 741"

      Reply
    • Kristian Tot says

      thanks

      Reply
  49. saikumar sutrave says

    will it work for high loads like 60(or)80watts bulb

    Reply
    • Swagatam says

      yes it will…

      Reply
  50. Mahesh K Thakur says

    hello sir,
    I make second circuit as shown by the circuit diagram, only Red LED glow. I didn't understand the reason.
    Is there any specification of mic.
    Plz help me im very thankful to u

    Reply
    • Swagatam says

      Hello Mahesh,
      connect another led in series with R4, now adjust the preset carefully until it just shuts off…now clap in front of the MIC, the circuit should respond as proposed, and this LEd will momentarily flash and again shut off.

      Reply
  51. Sankar Avp says

    pick up the pot from ckt

    Reply
  52. pavithra devi says

    i dnt knw hw to connect the relay in the circuit can u pls help me

    Reply
  53. Harish Rao says

    hello sir i want 2 make a clap switch for my requirement but how can i use it for a dc supply.what changes to be made for the above circuit to use it in dc supply. i will thank full to u if u suggest me

    Reply
    • Swagatam says

      hello Harish, what is the DC load that you intend to connect?

      Reply
    • Harish Rao says

      its 9-12volts sir

      Reply
    • Swagatam says

      Harish, you can use a standard 12V, or 9V AC/DC adapter for powering the circuit, even a mobile charger will work if a 5V relay is used, no changes would be required.

      Reply
  54. Rishabh masoun says

    dear sir,
    i m a student. my teacher has gave me this model
    will u please give a easy stepwise note that how can i make this………
    plzzzz sir……

    Reply
  55. Steve Carter says

    I have assembled the board for an extra credit project for an engineering physics class however it is not working. When I connect power to the circuit I'm getting a random array of lights either one or two and clapping has no effect on the system, any ideas what could have caused this? I have checked and rechecked and the diagram has a few mislabeled items such as two R5's and no R3. Please help me thank you very much.

    Reply
    • Swagatam says

      The circuit could need some fine tuning and tweaking before it produces the intended results.

      You can try the following few thing's:
      decrease R1 to 2.2k or to any smaller value
      remove C3 from its shown position and place it in parallel to the collector resistor of the BC557,
      use BC547 for T1.

      I'll correct the mislabeled pats quickly…

      By the way there are no lights in the circuit??

      Reply
  56. ifeanyi anthony nwaobasi says

    Please, I have no access to IC741. Can I connect the amplification stage of diagram 1 to the 4017 flip flop configuration of diagram 2……. Merry xmas

    Reply
    • Swagatam says

      yes you can do it.

      Reply
  57. astitva lal says

    do we have to use the same parts for the second one?

    Reply
  58. AMAN SINGHAL says

    below circuit published by u does not work when i clap nothing happens i have checked my all connections twice only the red LED glows

    Reply
  59. priy says

    what is the output of the relay in the second circuit?

    Reply
    • Swagatam says

      via N/O

      Reply
  60. Seok Sothea says

    Sir.! I want to make a circuit about voice interrupt music..this circuit consists of two input, audio input and mic, and one output to amplifier. First, the input from any audio player. While playing, if their is any sound into microphone, audio will become mute. After the sound from microphone is stop, the audio will be increasing its volume rapidly to its initial volume for some seconds. So, can you guide me some sir?

    Reply
    • Swagatam says

      Hi Seok,

      I'll try to design it soon and inform you , also let me know where and how you are going to use this circuit?

      Reply
  61. aspinit says

    Hi, I am doing this for a project in my electronics class at school I have breadboarded the circuit exactly as above but nothing happens when I clap. I replaced the microphone with a switch to test also but that didn't work either. Can you please help me find the problem?

    Reply
    • Swagatam says

      which circuit did you make? Try the second one, it will surely work according to me.

      Reply
    • aspinit says

      Sorry, the first one worked fine it was my fault I was using a polarised capacitor for C2 :S

      Reply
    • Swagatam says

      OK, thanks!

      Reply
  62. Seok Sothea says

    I try to replace with 1uf to 10uf, but it is still the same.

    Reply
  63. Seok Sothea says

    Sir! I wonder one point sir..does this circuit active only with clap sound? And about other sound like speech sound? What happen when there are alot sound in that place?

    Reply
    • Swagatam says

      any loud sound will activate this device….it's more of a toy than a genuine switching device.

      Reply
  64. Swagatam says

    You can try the second circuit, it has more chances of succeeding, although both are untested.

    Reply
  65. Abhi says

    In the above article "Make a Simple Electronic Clap Switch Circuit", only one 230V supply line will pass through the circuit, right? And the other will directly go to the load?
    If yes, where do I exactly connect the two wires in the circuit, the first one coming from the supply line and the second one going to the load ( I can't understand that from the diagram)
    As I am an amateur, any help will be greatly appreciated.

    Reply
    • Swagatam says

      It's correct, one of the AC mains line will go to pole of the relay, while one of the load wires will go to the N/O contacts of the relay, you may refer to the following article for knowing more about relays:

      https://homemade-circuits.com/2012/01/how-to-understand-and-use-relay-in.html

      Reply
    • Abhi says

      Thanks! and I have one more doubt- according to the diagram given at the end of the article on this page- https://homemade-circuits.com/2012/01/how-to-understand-and-use-relay-in.html
      I have to connect the coil terminals in the DC circuit (which we are making), and one of the AC mains to the middle pin i.e. movable contact and the load line to the N/O terminal, right?

      Reply
    • Swagatam says

      Yes that's correct.

      Reply
  66. JACO DE VILLIERS says

    hi my name is jaco.
    i have a electronic project where im required to build a clap switch using the following componets:
    33 k ohm 1/4 W 5%
    1 M ohm 1/4 W 5%
    5 K 6 ohm 1/4 W 5%
    270 ohm 1/4 W 5%
    47 k ohm 1/4 W 5%
    BC 547
    100 uF 16 volt redail
    10 uF 16 volt redail
    1 uF 16 volt redail
    1N4148 diode
    5mm LED (red or green)
    electret microphone
    6 V DC PSU
    could yo please explain how to connect the circuit. this is my first time.
    thanks.
    Jaco

    Reply
    • Swagatam says

      Jaco,

      you can refer to the following circuits, it closely matches your application:

      https://homemade-circuits.com/2012/04/simple-clap-switch-circuit-using-only.html

      Reply
  67. kkaranjia says

    Dear Swagatam i will be sending you a circuit diagram in mail. kindly verify and tell weather it can work properly or not??

    Reply
    • Swagatam says

      OK, you can send it

      Reply
  68. kkaranjia says

    Dear Swagatam

    I know of this circuit and i want to the rf portion form this circuits and incorporate it with HT640 and HT648l so can i do that and if possible then what changes have to be made in the circuit???

    Reply
    • Swagatam says

      Dear kkaranjia,

      If you are intending to use the circuit which is given in the above mentioned datasheet then you will have to incorporate the RF modules shown in the first image of this article. HT640/648 cannot be used as they are en/decoders, not RF chips.

      https://homemade-circuits.com/2013/07/simple-100-meter-rf-module-remote.html

      Reply
  69. kkaranjia says

    Dear Swagatam I am in need of RF receiver transmitter circuit compatible with HT640 and HT648L. I want to make the circuit on my own so dont want the readymade available in market

    Reply
    • Swagatam says

      Dear kkaranjia,

      you may refer to the following article, the basic principle will be the same as explained here, just the pinout configuration will be different for your ICs:

      https://homemade-circuits.com/2013/07/simple-100-meter-rf-module-remote.html

      Reply
    • kkaranjia says

      Dear Swagatam

      I already know about this readymade RX-433 and TX-433 but i want to make circuits on my own so don't want to use this readymade ones. can we use the receiver transmitter circuit that is used with TX-2b and RX-2b???

      Reply
    • Swagatam says

      Dear kkaranjia,

      Yes, it can be used but what will you insert in the RF stages.

      Reply
    • kkaranjia says

      I didnt get your point. I want to make circuit 8 chanel transmission so i am using ht640 and ht648l for this purpose. its just for remotely controlling 4 motors. i am planing to use two L293d at the output bits of ht648l

      Reply
    • Swagatam says

      I responded to your previous comment where you mentioned TX2b and Rx2b chips. These chips require RF stages for operating an RC model

      Reply
    • kkaranjia says

      Dear Swagatam you asked that what will i insert in RF stage so didnt get this question of yours and i have circuit regarding this rf stage can u help me evaluate it, if yes then i can sent you the images on your email id.

      Reply
    • Swagatam says

      Dear kkaranjia,

      I was referring to the following circuits:

      datasheet.eeworld.com.cn/pdf/SILAN/153017_RX-2B.pdf

      anyway you can send it to my email ID.

      Reply
  70. suthaharan luxan says

    sir i am new one to this…will it work sir ?
    did u check it sir ?

    Reply
  71. kkaranjia says

    Dear Swagatam,

    Can You help me with RF receiver transmitter circuit which is compatible HT640 and HT648L. And I don't want the readymade circuit which is available, I want to make my own so please provide circuit if possible.

    Reply


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