Difference Between Alternating Current(AC) and Direct Current(DC)

Apr 29, 2012

The word AC and DC are pretty common with electronics and we all come across it while developing or dealing electronic circuit designs.

Simplest Piezo Driver Circuit Explained

In the previous post we discussed a piezo transducer element and learned how to use it with electronic circuits. In this article we will see how a piezo tranducer can be driven or operated using a simple circuit.

Understanding and Using a Piezo Transducer

A piezo transducer is a device primarily used for converting an applied frequency to audible sound. It may be compared to a loud speaker, the only difference being the handling capacity and the operating principles.

Make This Piezo Driver, LED Warning Indicator Circuit

Apr 28, 2012


The circuit explained here can be used as a warning indicator device in conjunction with some sensor for generating an audible as well as a visual indication.

Make This Mains Transformerless LED Controller Circuit


Normally LED control circuits are based on buck boost or flyback principles, where the circuit is configured to produce a constant DC for illuminating an LED series.

Cell Phone Call Alert Security System Circuit

Apr 26, 2012

This circuit will give call back alerts in the form of blank calls on your cell phone whenever it senses a break in or intrusion inside the particular restricted area where it has been installed for the intended security monitoring.

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Water Level Indicator Circuit


There are many posts in this blog which essentially explain water level controller circuits, with the specific intentions of switching the involved motor pump when the tank fills up.
However there are folks who just require an indication of the different levels of water in the tank rather than have an automatic shut off facility.

Make This Powerful 200+200 watts Car Stereo Amplifier Circuit

No complex wiring, no costly MOSFETS and no cumbersome heatsinks, yet a powerful 200+200 watt amplifier circuit, which can be built within hours using just a couple ICs, right in your home.

Make This Mini Hi-Fi Ipod Amplifier Circuit Using IC 741

Apr 25, 2012


A very simple and small audio amplifier circuit has been presented here which can be constructed by all new electronic hobbyists for amplifying small signal frequencies and for other similar experiments.

Astable Multivibrator Circuit Using NAND Gates

Apr 23, 2012

 An astable multivibrator is referred to an electronic configuration which is able to generate continuous alternate high and low pulses from a couple of outputs, operating in tandem.

How to Make a Long Duration Timer Circuit

A timer in electronics is essentially a device which is used for producing time delay intervals for switching a connected load. The time delay is set externally by the user as per the requirement.

Add this Short Circuit Protection to Your Power Supply

Apr 22, 2012

A power supply unit is an indispensable unit for every electronic enthusiast and engineers working in the relevant field. Though today all of us use hi-tech power supply units having built-in protection, there are folks who still rely on ordinary types of power supply units with no protection facility.

Make this Amplifier Short/Overload Protection Circuit

While working with high power amplifier designs, two things become crucial, the protection of the amplifier and the protection of the speakers from an accidental over current influx.

Make This Simple Motion Detector/Sensor Alarm Circuit

Motion detector or sensor alarm is a device which detects the presence of a motion or movement within a certain fixed range and raises an alarm on doing so.

How to Check a MOSFET Using a Digital Multimeter

Apr 21, 2012

MOSFETs are outstanding devices when it comes to amplifying or switching of various kinds of loads. Though transistors are also largely applied for the above purposes, both the counterparts are hugely different with their characteristics.

Cheap Semi Automatic, Tank Water Over Flow Controller Circuit

The circuit presented here monitors the level of the water rising inside a tank and automatically switches OFF the pump motor as soon as the water level reaches the brim of the tank.

Simple LED Bulb Circuit

LEDs are being Incorporated in vast magnitudes today for everything that may involve lights and illuminations. White LEDs have especially become very popular due to their mini size, dramatic illuminating capabilities and high efficiency with power consumptions.

Semi Automatic Water Level Controller/Timer Circuit

Apr 20, 2012

The explained circuit of a water level controller circuit is based on a timer circuit whose time delay is first adjusted to match the filling time of the tank, as the the tank fills, the timer delay also simultaneously lapses and its output switches OFF the water pump.

2 Tone Ringtone Generator Circuit

The IC LS1240A from SGS Thompson is specifically designed for generating a 2 tone ringtone generator circuit. Thus the IC specifically becomes suitable for landline telephones for producing the ringtones when a call is received.

Understanding Transistor 2N3904

The transistor 2N3904 comes under the category of small signal, low power, general purpose transistor, mainly applicable for switching and for signal amplification.

Automotive Electronic Fuse Circuit

A fuse is a device used in electrical wiring for preventing accidental fire hazards due to to a short circuit or overloads. In ordinary mechanical type of fuses, a special fusible wire is used which melts when there's short circuit at some point in the wiring.

How to Make an Automatic Refrigerator Temperature Controller Circuit

The circuit idea was requested to me by one of the keen readers of this blog Mr.Gustavo. I had published one similar circuit of a refrigerator thermostat, however the circuit was intended to sense higher temperature level available at the rear side grid of refrigerators.

Digital Modified Sine Wave Inverter Circuit - 250 watts

Yesterday I developed yet another interesting sine wave inverter circuit, rather it's a modified sine wave, or can also be referred as a digital sine wave inverter circuit.

How to Make a Simplest 100 Watt MOSFET Amplifier Circuit

Apr 16, 2012

MOSFET based amplifiers as we all know are outstanding with their sound qualities and they can easilly beat the performance of other counterparts based on power transistors or linear ICs.
However amplifiers based on mosfets are not always easy to design or make.

How to Make a Simple Programmable Timer Circuit

A programmable timer is a device which can be used for switching a load ON and OFF after predetermined delays as per the requirements.

Earthquake Sensor Circuit - Seismic Sensor Circuit

The article shows an earthquake sensor circuit idea which incorporates an innovative way of detecting the minutest of shocks caused by a possible earthquake tremor. The circuit is so sensitive that it is able to detect tremor of 4 on the Richter scale, yet remains unaffected to loud sounds or irrelevant bangs or noises.

How to Make a Simplest Triac Dimmer Switch Circuit

Apr 11, 2012

We have already seen in many of my earlier articles how triacs are used in electronic circuits for switching AC loads.

Understanding BEL188 Transistor Specification/Datasheet

The transistor 188 is one of my favorites, simply because even being so tiny it's able to handle currents as high as 1 Amp.

Simple Solar Battery Charger Circuit

Apr 10, 2012

The post explains a simple solar battery charger circuit using the IC LM338 which can be built and installed by even a layman for achieving the intended results.

How to Use Triacs for Controlling Inductive Loads like Transformers and AC Motors

Apr 8, 2012

A Triac is a semiconductor device used for switching AC loads. Normally it is recommended that the loads that needs to be operated through triacs should be resistive in nature, meaning loads which incorporate coils or capacitors heavily, must be avoided.

How to Make IC 741 Application Circuits - Power Amplifier and Regulated Power Supply Circuits

This blog includes many interesting circuits which incorporates the IC 741 as the main active component for implementing the proposed functions. The present post explains yet a couple of more useful IC 741 application circuit ideas especially designed for the new electronic hobbyists.

Simple Clap Operated Stairway Light Switch Circuit

Stairways, corridors or small indoor passages often tend to be dark throughout the day irrespective of the outdoor ambient light conditions. Therefore keeping such passages illuminated all the the time becomes imperative, however this leads to unnecessary wastage of electricity.

Simple Clap Switch Circuit Using Transistors

In one of my earlier post we learned a simple clap switch circuit which incorporated an IC for implementing the desired flip flop actions. The present design uses a different principle and utilizes only transistors for the above triggering actions.

How to Make 1 A Constant Current LED Driver Circuit

The article explains a simple circuit using the IC MBI6651 from MACROBLOCK. The IC has been specifically designed for operating high power LEDs safely by providing a constant current output. The circuit includes very few external components and therefore becomes very easy to assemble at home.

Car Shock Alarm Circuit

Apr 5, 2012

Today most of the cars are equipped with this type of security feature where an alarm is raised in an event of a shock or a hit made over the car body. The article explains a very simple and cheap car shock alarm circuit which costs hardly 1/2 a dollar yet performs the actions reasonably accurately.

How to Make an Incubator Timer Circuit - Egg Incubation Optimizer

A timer circuit design which could be used for turning the position of the eggs in an incubator between predetermined intervals of time was requested to me by one of the keen readers of this blog, Mr. Eugene. 
The requested circuit has been exclusively designed by me and published here, 

Sound Activated Alarm Circuit

Apr 2, 2012

A simple sound activated alarm circuit is a device which is used for triggering an alarm on detection of a sound vibration. The sensitivity of the unit is set externally according to the requirement of the user.

IC LM338 Application Circuits - Explained in Simple Words

Apr 1, 2012

The IC LM338 by TEXAS INSTRUMENTS, is a versatile IC which can be wired in numerous different ways for obtaining high quality power supply circuit configuartions.
The following circuit examples simply depict few of the very interesting useful power supply circuits using this IC.

How to Design a Power Supply Circuit - Simplest to the Most Complex

Whether it's an electronic noob or an expert engineer, all require this indispensable piece of equipment called the power supply unit. This is because no electronics can run without power, to be precise a low voltage DC power, and a power supply unit is a device which is specifically meant for fulfilling this purpose.
 

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