• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

Homemade Circuit Projects

Get free circuit help 24/7

  • 1000+ Circuits
  • Privacy Policy
  • About Us
  • Contact
  • Disclaimer
  • Videos – Circuit Test Results
You are here: Home / Inverter Circuits / Automatic Inverter Output Voltage Correction Circuit

Automatic Inverter Output Voltage Correction Circuit

Last Updated on February 3, 2021 by Swagatam 79 Comments

The common problem with many low cost inverters is their incapability of adjusting the output voltage with respect to the load conditions. With such inverters the output voltage tends to increase with lower loads and falls with increasing loads.

The circuit ideas explained here can be added to any ordinary inverter for compensating and regulating their varying output voltage conditions in response to varying loads.

Design#1: Automatic RMS Correction using PWM

The first circuit below can be considered perhaps an ideal approach of implementing a load independent auto output correction using PWM from a IC 555.

automatic inverter output RMS correction circuit

The circuit shown above can be effectively used as an automatic load triggered RMS converter and could be applied in any ordinary inverter for the intended purpose.

The IC 741 works like a voltage follower and acts like a buffer between the inverter output feedback voltage and the PWM controller circuit.

The resistors connected with pin#3of the IC 741 is configured like a voltage divider, which appropriately scales down the high AC output from the mains into a proportionately lower potential varying between 6 and 12V depending upon the output status of the inverter.

The two IC 555 circuit are configured to work like modulated PWM controller. The modulated input is applied at pin#5 of the IC2, which compares the signal with the triangle waves at its pin#6.

This results in the generation of the PWM output at its pin#3 which varies its duty cycle in response to the modulating signal at the pin#5 of the IC.

A rising potential at this pin#5 results in the generation wide PWMs or PWMs with higher duty cycles, and vice versa.

This implies that when the opamp 741 responds with a rising potential due to a rising output from the inverter causes the output of IC2 555 to widen its PWM pulses, while when the inverter output drops, the PWM proportionately narrows at pin#3 of IC2.

Configuring the PWM with Mosfets.

When the above auto correcting PWMs is integrated with the mosfet gates of any inverter will enable the inverter to control its RMS value automatically in response to the load conditions.

If the load exceeds the PWM the inverter output wil tend to go low, causing the PWMs to widen which will in turn cause the mosfet to turn ON harder and drive the transformer with more current, thereby compensating the excess current draw from the load

Design#2: Using opamp and Transistor

The next idea discusses an opamp version which can added with ordinary inverters for achieving an automatic output voltage regulation in response to varying loads or battery voltage.

The idea is simple, as soon as the output voltage crosses a predetermined danger threshold, a corresponding circuit is triggered which in turn switches OFF the inverter power devices in a consistent manner thereby resulting a controlled output voltage within that particular threshold.

The drawback behind using a transistor could be the involved hysteresis issue which could make the switching fairly over a wider cross section resulting in a not so accurate voltage regulation.

Opamps on the other hand can be immensely accurate as these would switch the output regulation within a very narrow margin keeping the correction level tight and accurate.

The simple inverter automatic load voltage correction circuit presented below could be effectively used for the proposed application and for regulating the output of an inverter within any desired limit.

The proposed inverter voltage correction circuit can be understood with the help of the following points:

A single opamp performs the function of a comparator and a voltage level detector.

Circuit Operation

The high voltage AC from the transformer output is stepped down using a potential divider network to about 14V.

This voltage becomes the operating voltage as well as the sensing voltage for the circuit.

The stepped down voltage using a potential divider corresponds proportionately in response to the varying voltage at the output.

Pin3 of the opamp is set to an equivalent DC voltage corresponding to the limit which needs to be controlled.

This is done by feeding the desired maximum limit voltage to the circuit and then adjusting 10k preset until the output just goes high and triggers the NPN transistor.

Once the above setting is done the circuit becomes ready to be integrated with the inverter for the intended corrections.

As can be see the collector of the NPN needs to be connected with the gates of the mosfets of the inverter which are responsible for powering the inverter transformer.

This integration ensures that whenever the output voltage tends to cross the set limit, the NPN triggers grounding the gates of the mosfets and thereby restricting any further rise in the voltage, the ON/OFF triggering continues infinitely as long as the output voltage hovers around the danger zone.

It must be noted that the NPN integration would be compatible only with N-channel mosfets, if the inverter carries P-channel mosfets, the circuit configuration would need a complete reversal of the transistor and the input pinouts of the opamp.

Also the circuit ground should be made common with the battery negative of the inverter.

Design#3: Introduction

This circuit was requested to me by one of my friends Mr.Sam, whose constant reminders prompted me to design this very useful concept for inverter applications.

The load independent/output corrected or output compensated inverter circuit explained here is quite on a concept level only and has not been practically tested by me, however the idea looks feasible because of its simple design.

Circuit Operation

If we look at the figure we see that the entire design is basically a simple PWM generator circuit built around the IC 555.

We know that in this standard 555 PWM design, the PWM pulses can be optimized by changing the ratio of R1/R2.

This fact has been appropriately exploited here for the load voltage correction application of an inverter.
An opto-coupler made by sealing an LED/LDR arrangement has been used, where the LDR of the opto- becomes one of the resistors in the PWM "arm" of the circuit.

The LED of the opto coupler is illuminated through the voltage from the inverter output or the load connections.

The mains voltage is suitably dropped using C3 and the associated components for feeding the opto LED.

After integrating the circuit to an inverter, when the system is powered (with suitable load connected), the RMS value may be measured at the output and the preset P1 may be adjusted to make the output voltage just suitable enough for the load.

How to Set Up

This setting is probably all that would be needed.

Now suppose if the load is increased, the voltage will tend to fall at the output which in turn will make the opto LED intensity decrease.

The decrease in the intensity of the LED will prompt the IC to optimize its PWM pulses such that the RMS of the output voltage rises, making the voltage level also rise up to the required mark, this initiation will also affect the intensity of the LED which will now go bright and thus finally reach an automatically optimized level which will correctly balance the system load voltage conditions at the output.

Here the mark ratio is primarily intended for controlling the required parameter, therefore the opto should be placed appropriately either to the left or the right arm of the shown PWM control section of the IC.

The circuit can be tried with the inverter design shown in this 500 watt inverter circuit

Parts List

  • R1 = 330K
  • R2 = 100K
  • R3, R4 = 100 Ohms
  • D1, D2 = 1N4148,
  • D3, D4 = 1N4007,
  • P1 = 22K
  • C1, C2 = 0.01uF
  • C3 = 0.33uF/400V
  • OptoCoupler = Homemade, by sealing an LED/LDR face to face inside a light proof container.

CAUTION: THE PROPOSED DESIGN IS NOT ISOLATED FROM INVERTER MAINS VOLTAGE, EXERCISE EXTREME CAUTION DURING THE TESTING AND SETTING UP PROCEDURES.




Previous: Make this Thermo-Touch Operated Switch Circuit
Next: Make this EMF Pump Circuit and Go Ghost Hunting

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!

You'll also like:

  • 1.  Solar Water Heater Circuit with Battery Charger
  • 2.  IC 556 Pure Sine Wave Inverter Circuit
  • 3.  Grid-tie Inverter (GTI) Circuit Using SCR
  • 4.  Synchronized 4kva Stackable Inverter
  • 5.  12V LED Backpack Power Supply Circuit
  • 6.  Sine Wave Inverter using Bubba Oscillator Circuit

Please Subscribe (Only if you are Genuinely Interested in our Newsletters)


 

Reader Interactions

Comments

    Your Comments are too Valuable! But please see that they are related to the above article, and are not off-topic! Cancel reply

    Your email address will not be published. Required fields are marked *

  1. Search Related Posts for Commenting

  2. Ifeanyichukwu says

    Hi Mr swag I need help can any of the above design regulate an inverter output of about 300-400V I to220v will look forward to your quick reply thanks

    Reply
    • Swagatam says

      Hi Ifeanyichukwu, yes they can adjusted to any value, as per any desired specifications

      Reply
      • Ifeanyichukwu says

        I tried the circuit out and it worked out fine thanks a lot .
        But , I also want to a flyback diode accross a 1000w inverter mosfet which diode would be best recommended

        Reply
        • Swagatam says

          You are welcome! the diode can be rated in accordance with the maximum load current the MOSFeT is supposed to handle.

          Reply
          • Ifeanyichukwu says

            Sorry for asking many questions the first design with a 555 timer how should the optimised pwms be connected to the gates of the mosfets and for the flyback diode I need a 40A type can you recommend one for me thanks I would be looking forward to your quick reply

            Reply
            • Swagatam says

              connect the anode side of a 1N4148 diode with each MOSFET gate, and join the cathodes to connect with the PWM out from the IC2 555

  3. Mathieu says

    Hello can i send you a schematic by mail?
    thank you

    Reply
    • Swagatam says

      OK!

      Reply
  4. mathieu says

    Hi Swag does the pwm rms design2 plugged on center tap of the transformer change the frequency of the inverter?
    frequency pwm (44H)
    frequency inverter (50hz)
    thank you!

    Reply
    • Swagatam says

      Hi Mathieu, how do you plug the PWM to center tap? Please clarify?

      Reply
      • Swagatam says

        Hi Mathieu, I saw the diagram but I don’t think it will work since you have used all N channel mosfet without bootstrapping. The center tap mosfet should be p channel.

        Reply
  5. mathieu says

    Hi Swag what is the voltage margin from 220VAC to 250vac on Design#2 with the 741? (the circuit has a variation from 1v to 11V50!) how can i convert the high voltage 230VAC with the 12v input?
    thank you

    Reply
    • Swagatam says

      Hi Mathieu, It can solved by cross multiplication. 220/250 = x / y
      where x corresponds to the PWM which produces 230V, and y corresponds to the PWM which will produce 250v

      Reply
  6. Mathieu says

    ok thank you
    best regards

    Reply
  7. Mathieu says

    Hello Swag ive just tested with the scope and i have a 100% dutycyle! the only problem is that i have the frequency who vary and the pwm shouldnt vary in frequency! do you have an idea? maybe changing the values of the capacitors on IC1?
    thanks

    Reply
    • Swagatam says

      Hello Mathieu, 100% duty cycle means a straight DC equal to the Vcc level. In the second design frequency will not change the PWM, it is the voltage level at pin5 that changes the PWM. Frequency should never vary because it is fixed by R1, C1 which are constant.

      Reply
  8. Mathieu says

    Hi Swag on Design#2 is it normal to have a frequency who varies from 60hz to 860hz? i mean for duty cycle does it works correctly for the pwm on pin 10 of the ic sg3525?
    thank you!

    Reply
    • Swagatam says

      Hi Mathieu, frequency is determined by R1/C1 which are fixed, therefore the frequency must be also constant, only PWM value must change if the pin5 voltage changes.
      The width of the PWM on pin10 decides for how long the output remain shut off, so it works for controlling the output proportionately. You can try the same on pin9.

      Reply
  9. Mathieu says

    Hi Swag on your (Design#2: Automatic RMS Correction using PWM) i have 60HZ to 860hz duty cycle! youve told me for the sg3525 pwm pin :(Hi Mathieu, connect it with pin10 of the IC)
    i have connected it but the frequency is unstable! 125 to 320 hz! can you give me an idea? thank you!
    have a nice day

    Reply
    • Swagatam says

      Hi Mathieu, duty cycle is measured in %. Do you mean frequency of minimum/maximum pWms, anyway the frequency on meter will show unstable due varying pwm frequency.

      please check using an oscilloscope across the output of the transformer, you will find a stable 50 Hz frequency…please don’t check with a meter.

      Reply
  10. AK says

    Thanks Swagatham, for popularizing the Power Electronics through off the shelf components accessible at retail ele’ shops and simple enough for do-able by a hobbyist.
    When enthusiasts construct circuits interfacing to transformer, it is necessary that the lowest frequency generated is matching the min. frequency for transformer. Else transformer can fail. The timer IC 555 has tendency for such frequency drift. Hence always better to use present resistance to tune the frequency.
    Secondly, when connecting the grid tied inverter to mains, synchronizing is important. Also, conducted and radiated noise are to be below regulatory limits.

    Reply
    • Swagatam says

      Thank you AK!

      Reply
  11. mathieu says

    Hi Swag i have put a varistor on pin 5 of ic2 to obtaine 0v on that pin and it varies from 2,3hz and abrubtly monted to 860hz! who is the frequency of ic1(860hz)!if i apply a voltage from the follower there is no change on the frequency!
    i dont understand, why apply a voltage from the 741 (1,2V to 11,60V) on pin 5who has a Vcc voltage? how can that works?
    thank you!

    Reply
    • Swagatam says

      Hi Matheiu, I am not sure why a varistor may be required at pin5, it is not required. You can put a 1K resistor instead. Varying voltage at pin5 will create proportionately varying pwm at pin3, which in turn will control the inverter output…..I have explained the rest in the article itself.

      Reply
  12. mathieu says

    Hi Swag on pin 5 of IC2 i have +5Vcc! it cause a problem with the voltage follower! can you explaine me the default
    thanks!

    Reply
    • Swagatam says

      Hi Mathieu, it should be at 1/3rd of the supply level. However, adding a 1K across pin5 and ground will cause the output pwm to attain minimum width by default, which can be proportionately increased by applying a proportionately rising DC at pin5.

      Reply
  13. mathieu says

    Hi Swag i have problems with the monostable configuration! i have send the schematic on your mail! ive tried differents resistors and caps! i have the signal from ic1 astable but ic2 there is nothing! the 555 is functional!

    Reply
    • Swagatam says

      Hi Mathieu, the circuit using IC1, IC2 in the above article is a tetsed design. When pin5 is modulated with a varying DC the output from IC2 creates proportionate amount of PWM. Remember the monostable output will respond when pin2 is pulsed with a GROUND signal….you can test that manually

      Reply
  14. mathieu says

    Hi Swag i have another question! if the frequency on design2 with a frequency meter is ok (7hz 105hz) but on the scope the result of the pwm is blur! where can be the breakdown from?
    thanks

    Reply
    • Swagatam says

      Hi Mathieu, scope blurred output can be due to 3 reasons 1) Your scope is defective, 2) you have not set it correctly, 3) the frequency is beyond the range of the scope. There cannot be any other reason for a blurred output in a scope other than these.

      A frequency meter can be wrong but a scope can never be wrong.

      Please use a digital oscilloscope, no matter how cheap or small it may be, it will show you the correct results.

      Reply
  15. mathieu says

    Hi Swag, ive tested design2 with frequency meter results: 7hz to 105hz,the following is ok! but with the scope it is a disaster! the pwm is barely viewable!
    thank you helping me!

    Reply
    • Swagatam says

      No Problem Mathieu, wish you all the best!

      Reply
  16. mathieu says

    Hello Swag i have finished the two 555 pwm ive tried one in astable with a 741 voltage follower result: 1KHZ to 500hz, with the scope i have 50 to 100 duty cycle!
    with the second pwm i have the astable and monostable but the frequency works from 887hz to 450HZ! why does the frequency changes roughly from 887HZ TO 450HZ?
    does the circuit is linear from 0hz to 1khz? (1% to 98% duty cylce)?
    thank you!

    Reply
    • Swagatam says

      Mathieu, the frequency is fixed by the IC1 astable circuit, so the frequency should not change. The astable decides the number of blocks on the PWM cycles, while the monostable decides the width of the blocks….please use an oscilloscope to confirm that the number of blocks are always constant regardless of the PWM adjustments.

      Reply
  17. Evans mworeh says

    Hello sir swagatam, between the two of the auto voltage corrector circuits,which one is best? I understand u have provided us with two one using opamp741and ne555 and opamp 741 and transistor.

    Reply
    • Swagatam says

      The last one is the easiest and the recommended one!

      Reply
      • Evans mworeh says

        Thank you sir,I have now understood. But one issue for me, when adjusting the 10k preset until the npn transistor triggers,does it mean for instance if I I connect max voltage limit of 220v and start to adjust,will the output rise above this? Coz u say we should adjust till voltage goes high and npn triggers.

        Reply
        • Swagatam says

          The output will be equal to the pin7 voltage of the IC, which is 12V.

          Reply
          • Evans mworeh says

            Got it sir swagatam.

            Reply
  18. mathieu says

    Hi Swag, can i send you by email my schematic?

    Reply
    • Swagatam says

      yes you can send it!

      Reply
  19. Akeem says

    Hi. I have a signal been generated out of Arduino pwm pins. It works well as an oscillator for an inverter. But I don’t know how to apply feedback to it. My output keep decreasing when been loaded. How can I implement feedback to the programme? Thanks.

    Reply
    • Swagatam says

      That will require a different program code for the Arduino, which may not e possible for me to create. Alternatively you can add a external control circuit as explained in the last concept above.

      Reply
  20. mathieu says

    HI Swag is it possible to replace on design 1 the optocoupler by a lm741?
    if i can post you the schematic, are you ok for check on it?
    thank you for your patience!

    Reply
    • Swagatam says

      Hi Mathieu, yes it may be possible by feeding the inverter voltage sample to diode network and pin7 of the IC from IC 741 voltage follower circuit

      Reply
  21. Mathieu says

    Hi Swag IC2 on pin 5 is a capacitor for parasite used in astable mode why have you put the voltage fallower (741) to pin 5 of ic2? and a zener cut off on it? pin 5 is normally connected to ground, everything is ok while the irregular frequency when connected to IC2! (IC1 OK 130HZ,741 OK!)
    thank you!

    Reply
    • Swagatam says

      Hi Mathieu, if you ground pin5, IC2 will shut down so it cannot be connected to ground. The capacitor is for preventing any stray pick up by IC 2 pin5. Higher voltage on pin5 will produce wider PWM at pin3 of IC2, and vice cersa.
      The zener diode ensures that the maximum voltage at pin5 can never be over the supply range at pin4/8 of the IC

      Reply
  22. mathieu says

    Hi Swag for the pwm the frequency varies between 130HZ to 70HZ but looks unstable with my frequency meter! is it ok?

    Reply
    • Swagatam says

      Hi Mathieu, please check the frequency at pin#3 of IC1….

      Reply
  23. mathieu says

    Hello Swag ic1 is a reference frequency in monostable mode of ic2 but the 555 is unstable!can it cause problems for the final stage of the pwm?
    thank you

    Reply
    • Swagatam says

      Hello mathieu, IC1 is an astable, IC2 is a monostable. IC1 is configured to provide 95% ON time and 5% OFF time. The design is perfectly stable.

      Reply
  24. Mathieu says

    Hello Swag can i use it for 100Khz output ?

    Reply
    • Swagatam says

      Yes you can use it with any frequency of your choice…

      Reply
  25. mathieu says

    Hello Swag, can you tell me about the frequencies of ic1 ic2 and the 741 to have an idea! i have used your 555 monostable calculation but in milliseconds!
    thank you

    Reply
    • Swagatam says

      Hello Mathieu, IC1 frequency can be 200Hz for a 50 Hz inverter application. IC2 is a PWM converter, it takes the frequency from IC1

      Reply
  26. mathieu says

    hello Swag onDesign#2 pin 3 of the 741 do i apply a 12V input or a 6V? or do i need to check the good voltage by varing the potentiometer?
    thank you

    Reply
    • Swagatam says

      Hello Matheiu, use a DC for the inverter which produces 250V output……. now connect this 250V with the input of IC 741 divider, and adjust the pin3 preset such that the output of the inverter comes down to 230V

      Reply
  27. mathieu says

    Hi Swag on Design#2 what is the input ac voltage? 220V,110V? can it work in khz frequency? can i put a 230vac on input?
    thnak you!

    Reply
    • Swagatam says

      Hi Mathieu, it can be 110V or 220V it does not matter. The voltage divider resistors can be set according to the input supply level.

      Any frequency can be used.

      Reply
  28. mathieu says

    Hello Swag like the question above on Design#2 you havent tested yet this circuit! what % duty cycle can give this circuit? estimation!
    thank you!

    Reply
    • Swagatam says

      Hello matheiu, duty cycle will depend on the voltage level at pin#5. At 0V, the PWM will be almost zero, and at fully supply voltage the PWM will be almost 95% of the supply level.

      The IC1, IC2 stage is a fully tested deign

      Reply
  29. mathieu says

    Hello Swag for Design#2:
    pin 3 of the second 555 where will it be insert on a sg3525?
    thank you!

    Reply
    • Swagatam says

      Hi Mathieu,

      connect it with pin10 of the IC

      Reply
  30. Emmanuel Etim says

    Hi swagatam may the good lord continue to blessed you for the good work that you are doing by teaching the world the practical part of a electronic circuit.
    Please what if i should used a rectifier circuit in the transfor terminal before fed into the circuit, wouldn’t it work

    Reply
    • Swagatam says

      Thanks Emmanuel,

      yes you can add a bridge rectifier in the last circuit without any changes. It will also provide an isolation between the secondary and primary stages

      Reply
  31. moses kaluya says

    Hi swag i build inverter circuit using ic sg3525 successfully but only problem there is big delay when city power go off the inverter oscillator take time to switch on and this cause my computers to go off. How should solve this problem please swag!!!

    Reply
    • Swag says

      Hi Moses,

      Please post this question under the same article which you are referring to, so that I can see the schematic and understand the issue you are facing at the moment…

      Reply
  32. Aminu Yahaya Ibrahim says

    Good day Sir.
    Sir could you help me with a timing alarm circuit.
    I want the project to work as follow:
    1st, to ring an alarm at 35minuts intarval for atleat 3 times.
    2nd, to ring an alarm at 35minuts intarval for atleast 2 time.
    3rd, to ring an alarm at 35minuts interval for atleast 2times.
    Again, I want another one to work at 30 minuts interval with the above discriptions, that is 1st, 2nd and 3rd.

    Thanks for the help Sir.

    Reply
    • Swagatam says

      Aminu, you can try the following concept and adjust the stages accordingly as per your need

      https://homemade-circuits.com/2013/06/automatic-programmable-school-bell.html

      limit the number of timer stages as per your need…..

      Reply
  33. Aminu Yahaya Ibrahim says

    Thanks for the help Sir.
    But I dont mean C3 of IC4093 of the shared link. I mean C3 of the above IC555.

    Reply
    • Swagatam says

      you can use 0.47uF also for C3.

      Reply
  34. Aminu Yahaya Ibrahim says

    Sir, I built this circuit. But I did not used IC4047, as suggested, I used IC4093 as in this inverter:
    http://www.homemade-circuits.com/2012/02/how-to-build-400watt-high-power.html?m=1.

    And is it necessary to use C3 i.e 0.33uf 400v?
    Can I used any of 0.39uf 400v or 0.47uf 400v or any other one?
    Thanks Sir.

    Reply
    • Swagatam says

      Aminu, C3, and R7 are responsible for generating the basic 50Hz frequency, you can replace C3 with any other capacitor but then you will have to also change R7 value proportionately so that the 50Hz frequency is not disturbed.

      Reply
  35. Aminu Yahaya Ibrahim says

    Sir, I have bought the components of this circuit to give it try with the suggested circuit of IC4047 and I will update you on it very soon.

    Thanks for your effort to help us Sir.

    Reply
    • Swagatam says

      Aminu, I hope you have understood the working of the circuit and will be able to optimize the results correctly…otherwise it could be difficult to get the intended output.

      Wish you all the best

      Reply
  36. Wade Benjamin says

    Hi Swagatam, have you tested this circuit?

    Reply
    • Swagatam says

      Hi Wade, I have not yet tested it.

      Reply
  37. ainsworth lynch says

    I can just buy any optocoupler and place in this circuit right

    Reply
    • Swagatam says

      no, it's a homemade LED/LDR opto, not the regular ones that are available in the market

      Reply


  38. COMMENT BOX IS MOVED AT THE TOP


Primary Sidebar

Electronic Projects Categories

  • 3-Phase Power (15)
  • 324 IC Circuits (19)
  • 4017 IC Circuits (51)
  • 4060 IC Circuits (25)
  • 555 IC Circuits (92)
  • 741 IC Circuits (18)
  • Amplifiers (49)
  • Arduino Engineering Projects (82)
  • Audio Projects (84)
  • Battery Chargers (75)
  • Car and Motorcycle (87)
  • Datasheets (45)
  • Decorative Lighting (Diwali, Christmas) (31)
  • DIY LED Projects (81)
  • Electronic Components (97)
  • Electronic Devices and Circuit Theory (35)
  • Electronics Tutorial (99)
  • Fish Aquarium (5)
  • Free Energy (34)
  • Games (2)
  • GSM Projects (9)
  • Health Related (17)
  • Heater Controllers (23)
  • Home Electrical Circuits (98)
  • Incubator Related (6)
  • Industrial Electronics (26)
  • Infrared (IR) (39)
  • Inverter Circuits (94)
  • Laser Projects (10)
  • LM317/LM338 (21)
  • LM3915 IC (24)
  • Meters and Testers (54)
  • Mini Projects (153)
  • Motor Controller (64)
  • MPPT (7)
  • Oscillator Circuits (12)
  • PIR (Passive Infrared) (8)
  • Power Electronics (33)
  • Power Supply Circuits (66)
  • Radio Circuits (9)
  • Remote Control (46)
  • Security and Alarm (56)
  • Sensors and Detectors (116)
  • SG3525 IC (5)
  • Simple Circuits (72)
  • SMPS (30)
  • Solar Controllers (60)
  • Timer and Delay Relay (51)
  • TL494 IC (5)
  • Transformerless Power Supply (8)
  • Transmitter Circuits (38)
  • Ultrasonic Projects (12)
  • Water Level Controller (45)

Follow Homemade Circuits

Facebook
Twitter
YouTube
Instagram
My Facebook-Page
Quora

Feeds

Post RSS
Comment RSS

Circuit Calculators

  • AWG to Millimeter Converter
  • Battery Back up Time Calculator
  • Capacitance Reactance Calculator
  • IC 555 Astable Calculator
  • IC 555 Monostable Calculator
  • Inductance Calculator
  • LC Resonance Calculator
  • LM317, LM338, LM396 Calculator
  • Ohm’s Law Calculator
  • Phase Angle Phase Shift Calculator
  • Power Factor (PF) Calculator
  • Reactance Calculator
  • Small Signal Transistor(BJT) and Diode Quick Datasheet
  • Transistor Astable Calculator
  • Transistor base Resistor Calculator
  • Voltage Divider Calculator
  • Wire Current Calculator
  • Zener Diode Calculator

© 2021 · Swagatam Innovations