Simple Water Level Indicator

jacky October 18, 2017 271 Comments

Water Level Indicator Description This is the circuit diagram of a simple corrosion free water level indicator for home and industries. In fact the the level of any conductive non corrosive liquids can be measured using this circuit. The...
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Simple Lamp Dimmer/ Fan Regulator

admin November 22, 2011 33 Comments

A Lamp Dimmer/Fan Regulator Circuit We have modified this circuit: – Take a look – Modified Lamp Dimmer Description . This is the circuit diagram of the simplest lamp dimmer or fan regulator.The circuit is based on the principle...
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Fridge Door Alarm

jacky November 22, 2011 10 Comments

Fridge Door Alarm Circuit Description. This is a fridge door alarm circuit, which produces an audible alarm when fridge is left open for a preset time. This versatile alarm is based  on two 555 timer IC’s. Both ICs are...
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High Power Siren

admin April 12, 2011 3 Comments

High Power Siren Circuit Description. This article is all about a comparatively strong siren circuit useful for any purpose.A complementary transistor pair (BC 557 & 337) is arranged as an oscillator, directly drives the speaker.Transistor Q1(BC 557) is used...
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Automatic LED Emergency Light

admin January 23, 2018 322 Comments

LED Emergency Light We have developed three circuits under Automatic LED Emergency Light. Two of them are designed by Mr. Seetharaman, a very valuable and important contributor of this website. We have listed the circuits here for your ease...
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Volume Control Circuit

jacky April 27, 2011 3 Comments

Digital Volume Control Circuit Description This is the circuit diagram of a digital volume controller for any sort of audio amplifiers or almost any circuit where a mechanical potentiometer is there(conditions apply). Simple and low cost, the heart of...
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Electronic Combination Lock using IC LS 7220

jacky April 12, 2011 43 Comments

Electronic Combination Lock Circuit Description This is the circuit diagram of a simple electronic combination lock using IC LS 7220.This circuit can be used to activate a relay for controlling (on & off) any device when a preset combination...
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Tone Generator-Ding-Dong Bell

jacky November 22, 2011 6 Comments

Tone Generator Circuit Description Here we present a simple and low cost tone generator circuit, a ding dong bell suitable for calling bell purposes.It is made around IC 8021. It is an 8 pin IC but only four pins...
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Simple Proximity Detector

jacky April 28, 2011 11 Comments

How to make a simple Proximity detector or sensor Description This is a simple proximity detector using IC CS209. The CS209A is a bipolar monolithic integrated circuit for use in metal detection/proximity sensing applications.The CS209A contains an oscillator set...
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