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General Circuits Contd.

1. Capacitance Bridge
2. CD-ROM Drive as Digital-audio CD-Player
3. Clap Switch
4. Condenser mic audio amplifier
5. Contactless AC Mains Voltage Detector

6. Dark Activated Switch
7. Darkness Controlled Light switch
8. DC MOTOR CONTROL USING A SINGLE SWITCH
9. Decibel Meter
10.Digital Switching System
11.Electronic Stethoscope
12.Fan Controller
13.Flashing-cum-Running Light
14.FM Beacon Broadcast Transmitter (88-108 MHz)
15.Four-in-one burglar alarm

16.FRIENDLY CHARGER FOR MOBILE PHONES