Simple Digital Stopwatch Circuit

Feb 26, 2015

In this article we'll study a digital stopwatch design configured around the very popular IC LM555 in conjunction with a 4-digit counter IC with multiplexed 7-segment output drivers (MM74C926).

Simple Digital Clock Circuit Explained

Feb 25, 2015

The digital time clock explained here is a circuit which most electronic amateurs would love to make.

Make this LED Cricket Stump Circuit at home

Feb 24, 2015

In this post we learn how to make an LED cricket stump for helping umpires declare a foolproof OUT, NOT-OUT decisions.

SG 3525 Automatic PWM Voltage Regulation Circuit

Feb 18, 2015

The post explains a simple configuration which can be added with all SG 3525/3524 inverter circuits for implementing automatic PWM output voltage regulation by the IC. The solution was requested by Mr. Felix Anthony.

Car Interior Light Fader Circuit

The post explains a simple circuit which can be used for producing a slow fading light effect each time it's switched OFF. The application can be typically used in car interior lights.

6V to 220V Boost UPS Circuit for Satellite TV Modems

Feb 17, 2015

The post explains a simple boost converter UPS circuit for supplying an uninterruptible power to satellite TV set top boxes so that the offline recording is never allowed to fail during power outages. The idea was requested by Mr. Aniruddha Mukherji. 

Cellphone Jammer Circuit Explored

Feb 13, 2015

This is a RF jammer designed for the U.S. 800 MHz cellular phone band (870-895 MHz). This works by generating an overwhelming sweeping RF carrier on the cell phone handset's operating frequency range.

Voltage Stabilized Transformerless Power Supply Circuit

Feb 11, 2015

The post explains how an ordinary capacitive power supply may be transformed into a surge free voltage stabilized or variable voltage transformerless power supply applicable for almost all standard electronic loads and circuits. The idea was requested by Mr. Chandan Maity.

Light Activated Water Level Controller Circuit

Feb 8, 2015

The light activated water level controller circuit explained here has the advantage of being corrosion free and much reliable than the traditional moisture sensor type of water sensors.

Infrared Remote Control Security Lock Circuit for Automotive Applications

Feb 6, 2015

A simple, cheap yet highly effective infrared remote control security lock circuit can be studied in the following post.

Proximity Detector Circuit Using IC 555

Feb 5, 2015

In this article we discus a simple IC 555 based proximity detector circuit.

Measuring Gain (β) of a BJT using a simple Circuit

In this post we'll study a simple opamp circuit design which can be applied for measuring the beta or the forward current gain of a particular BJT in question.

Simple Music Box Circuit

Feb 4, 2015

This simple circuit can be used to emulate the operation of a music box. The number of notes may be limited to 10 at the most, and therefore is capable of generating a simple melody.

Extended Telephone Ring Amplifier/Repeater Circuit

The discussed phone repeater circuit can extend the range of your land line ring sound from the phone such that one is able to make a call heard in another room or even in another house.

Simple Thermostat Circuit Using Transistors

Feb 3, 2015

The electronic thermostat explained here can be used to control the room temperature by appropriately switching (turning on and off) a heating device.

Power Interruption Alarm Circuit

Feb 2, 2015

This power interruption alarm circuit will alert you whenever there's a power failure or an interruption in the mains. In some special conditions it becomes imperative to know whether the mains that powers some important system or circuit is absent.

Automatic Night Operated LED Lamp

This circuit is not only simple but very interesting and very easy to build. You might have seen the new flashlights manufactured with new high bright high efficiency LEDs.

Differential Temperature Detector/Controller Circuit

Feb 1, 2015

The circuit identifies and detects the temperature difference between two sensors and activates a relay when the temperature is not identical on these differently positioned sensors.

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