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LED Based Car Battery Voltmeter

admin May 25, 2010 2 Comments
Circuit Description Here is a simple car battery voltmeter circuit using LEDs that can be easily installed in cars. This circuit consists of four LEDs and a quad operational amplifier IC LM 324 as its main part. This circuit...
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Simple Metal Detector Circuit

admin May 25, 2010 3 Comments
Circuit Description The circuit diagram of cost effective metal detector has been published here. This circuit and an old pocket radio constitute a simple metal detector device. This circuit is a Colpits oscillator circuit is operating at medium frequency...
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Simple Photo Switch Circuit

admin May 24, 2010 2 Comments
Circuit Description The circuit diagram given here is a photo switch which switches on a relay when the intensity of light falling on its sensor changes from a preset limit. The central part of this circuit is the IC...
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Power Supply Circuit Using LM 317 IC

admin May 24, 2010 No Comments
Circuit Description The circuit diagram 40V 2A power supply circuit has been described here. The central part of this circuit is the voltage regulator IC LM 317. This power supply circuit is ideal for circuits such as power amplifier circuit...
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Simple Melody Generator Circuit

admin May 24, 2010 2 Comments
Circuit Description The circuit diagram given here is a simple melody generator. The core part of the circuit is the IC UM66 which is a CMOS type IC. One of the main features of this circuit is that in...
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Op-Amp Radio Circuit

admin May 24, 2010 2 Comments
Circuit Description Here is the circuit diagram of simple operational amplifier radio that can be employed to hear nearby stations. This circuit is based on quad operational amplifier LM 324. This operational amplifier radio consists of crystal radio and sensitive...
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Simple PWM Motor Speed Controller

admin May 18, 2010 4 Comments
Circuit Description Here is the circuit diagram of PWM motor speed controller. The application of this circuit lies in the speed control of low power DC motors. The core part of this circuit is the IC CD40106B in which...
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Simple Musical Light Chaser Circuit

admin May 17, 2010 3 Comments
Circuit Description The circuit diagram of musical light chaser has been described here. The main parts of this circuit are two transistors Q1, Q2 (BC 107) and IC1, IC2 (CD 4017). Transistor Q1 in this circuit acts as amplifier...
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Direct Coupled Radio Circuit

admin May 16, 2010 No Comments
Circuit Description Here is the circuit diagram of direct coupled radio. The central and core part of this circuit consists of three transistors Q1 (HEP 641), Q2 (HEP 253) and Q3 (HEP 641) as shown in the circuit diagram....
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