270 MINI ELECTRONICS PROJECT WITH CIRCUIT Content Of the Book: 1. DC-DC converter 1 2. Periodically On-Off Mosquito Repellent 2 3. IR sensors (infrared LEDs) to make an object-detection circuit 3 4. Simple Key-Operated Gate Locking System 4 5. Mains Box Heat Monitor 5 6. Faulty Car Indicator Alarm 5 7. TACHOMETER 6 8. 1W LED For Automotive Applications 7 9. Play With Robotic Eye (IR Sensor) 7 10..