WHITE LINE FOLLOWER

This circuit can be used for a toy car to follow a white line. The motor is either a 3v type with gearing to steer the car or a rotary actuator or a servo motor.
When equal light is detected by the photo resistors the voltage on the base of the first transistor will be mid rail and the circuit is adjusted via the 2k2 pot so the motor does not receive any voltage. When one of the LDRs receives more (or less) light, the motor is activated. And the same thing happens when the other LDR receives less or more light.
 

source : http://www.talkingelectronics.com.au/projects/200TrCcts/200TrCcts.html

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Automobile White crystal rectifier lightweight Circuit Diagram

Without any dedicated buck converter/white crystal rectifier driver IC, youll safely drive several customary Hi-efficient white crystal rectifier modules victimization the battery power out there in cars. Here may be a safe and easy white crystal rectifier driver designed for 12V cars.

Auto White LED Circuit Schematic

In the Automobile White crystal rectifier wiring, fastened transformer IC1 (7805) provides a gentle voltage of 5V across C2. Resistors R1 limits the present flow through the white crystal rectifier D1 (3v6/350mA) with the assistance of semiconductor T1 (and T2), i.e. parts R1, T1 (and T2) offer a relentless current to D1. Use a decent sink for T1. This crystal rectifier unit offers a relentless lightweight output for input voltages starting from eight to eighteen volts!

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