 Cellular Phone calling Detector
This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) by means of a flashing LED
Telephone line monitor
This nifty little circuit lets you record your phone conversations automatically
Ringing Phone Light Flasher
Makes your 220/110V bulb flashes when telephone rings. Can be very useful when you need silence, or just want to have strange phone :)
FM Telephone Bug
Extremely easy to build and very useful transmitter
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