Puff to OFF LED circuit.

admin November 11, 2011 29 Comments
Descrption. This is a simple circuit in which the glowing LED can be switched OFF just by a puff. A condenser mic (M1) is used to sense your puff. When the push button S1 is pressed, the transistors Q2...
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Parking sensor circuit

admin January 21, 2014 155 Comments
Description. This simple circuit can be used as an aid for sensing the distance between the rear bumper of the car and any obstacle behind the car. The distance can be understood from the combination of the LEDs (D5...
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12V Lamp flasher circuit.

admin April 7, 2010 3 Comments
Description. Here is a simple yet powerful circuit that can be used for flashing 12V lamps especially that is used on automobiles.The flashing circuit is based on transistor Q1(BC557) and MOSFET Q2 (IRF530) where the Q2 provides the necessary...
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Long duration timer circuit.

admin April 7, 2010 33 Comments
Description. This timer circuit can be used to switch OFF a particular device after around 35 minutes. The circuit can be used to switch OFF devices like radio, TV, fan, pump etc after a preset time of 35 minutes....
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Musical car reverse horn circuit

admin November 10, 2011 15 Comments
Description. Here is a simple circuit that will produce a musical horn when ever your car is in reverse gear.The circuit uses two ICs for the operation, voltage regulator 7805(IC1) and musical tone generator UM66(IC2). The IC1 reduces the...
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Metronome generator circuit.

admin April 7, 2010 2 Comments
Description. Here is a simple circuit using IC NE555 that can be used to generate metronomes.Such a circuit is very useful to those who learns music. The circuit is nothing but an astable multivibrator wired around NE555 .The components...
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Musical horn circuit.

admin November 10, 2011 24 Comments
 Description. Here is a simple circuit diagram of a simple musical horn using two NE555 ICs. Two ICs are wired as astable mutivibrators. The output of first multivibrator is given to the discharge (pin 7) of the second astable...
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Door bell circuit using NE555

jacky January 27, 2014 24 Comments
Description. The main part of this doorbell circuit are two NE555 timer ICs.When some one presses switch S1 momentarily, the loud speaker sounds a bell tone as long as the time period of the monostable multivibrator built around IC1....
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Head light timer circuit

admin April 7, 2010 4 Comments
Description. This circuit is a compact timer circuit that will keep the headlights of your car ON for about 1.5 minutes and then turns it OFF.This circuit incorporated to your car will help you to access dark places with...
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