24W amplifier using TDA1516

john April 7, 2010 18 Comments
Description. Here is the circuit diagram of a simple 24W mono amplifier using IC TDA1516.The TDA1516 is an integrated class B power amplifier in a 13 pin SIL package. The IC has many useful features such as short circuit protection, load dump protection, thermal protection, reverse polarity protection etc. Here the IC is wired in BTL mode to deliver 24W of power into a 4 ohm speaker. This amplifier can be operated from a 12V DC supply and this...
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Car battery charger

john April 7, 2010 53 Comments
Description. Given below, is a very simple circuit that can be used for charging car batteries. In this circuit there is facility for monitoring the charging current and voltage. The circuit is based on the IC MC78T12ABT from Freescale.The IC is nothing but a 7812 in TO-3 package with 3A capacity. The transformer T1 steps down the mains voltage and diodes D1&D2 does the job of rectification. Capacitor C1 does the filtering and C2 acts as a decoupling capacitor....
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3 LED battery monitor circuit

john January 27, 2014 55 Comments
Are you not familiar with the basics of electronics? We have just opened an online store where 4 very good books on basic electronics have been kept for sale. You can read the reviews of these books and buy them as you wish. These books are being followed by students in some of the best universities in the world. Check them out and buy copies here:- 4 GREAT BOOKS TO LEARN BASIC ELECTRONICS Description. This is the circuit diagram of...
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Automobile turn signal circuit.

jacky November 11, 2011 3 Comments
Description. This is a simple circuit that can be used as a sequential signal light in automobiles. The circuit is based on two ICs. A TS 555 CN CMOS timer IC and a CD4017 decade counter IC. The IC1 is wired as an astable multivibrator to trigger the counter IC. When triggered, the outputs of the IC 2 (pins 3, 2, 4 and 7) will go high and low in sequence and the speed of this sequencing will be...
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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 to D7) glowing. At 25cm D7 will glow, at 20 cm D7&D6 will glow and at 5cm D7, D6 and D5 will glow. When the obstacle is beyond 25 cm none of the above LEDs will glow. Two ICs are...
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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 drive for the lamp.Any number of bulbs can be flashed using this circuit provided that the total load must not exceed 42 Watts. Circuit diagram with Parts list. Notes.  Assemble the  circuit on a good quality PCB or common board....
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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 car battery voltage to 5V. The diodes D1 & D2 in combination  produces an additional  drop of 1.4 V to give a 3.6 V supply for the UM66. The supply voltage of UM 66 should not  be more than 4V....
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Missing pulse detector circuit using NE555

jacky July 25, 2011 4 Comments
Description. An NE555 timer IC connected as shown here can detect a missing pulse or abnormally long period between two consecutive pulses in a train of pulses. Such circuits can be used to detect the intermittent firing of the spark plug of an automobile or to monitor the heart beat of a sick patient. The signal from the pick up transducer is shaped to form a negative going pulse and is applied to pin 2 of the IC which...
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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 out the need to come back and turn OFF the head lights. When the push button switch P1 is pressed the capacitor C1 is charged to the full battery voltage.As a result the transistor Q1 is turned ON ,which in...
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Lamp flasher circuit

admin April 7, 2010 6 Comments
Description. This simple circuit that can be used to flash incandescent lamps up to 10W power rating.The circuit is ideal for making flashing beacons on automobiles and other applications like that.The circuit is nothing but  an astable multi vibrator based on Q1&Q2 ( BC557&BD139).The capacitor C1 is the main timing element which determines the flashing rate of the circuit.The switch S1 can be used as an ON/OFF switch. Circuit diagram with Parts list. Notes.  Power the circuit from a...
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