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Telephone: Cell/Mobile Phone Circuits - Detectors, Call Loggers

Mobile Phone Detector Circuits

Use these telephone circuits to detect incoming calls, call loggers, and more.

A very clever portable cell phone battery charger that uses 8x1.5 AA cells (batteries) to charge cell-phone / mobile phone batteries while mobile. No more need for a mains outlet!
A simple circuit that flashes an LED when a cell phone has an incoming call. Uses a coil to pick-up the signal emitted during an incoming call event. Cell phone call detector.
Photo: Cellular Phone Sound Effects Cellular Phone Sound Effects
Easy to build sound effect generator kits, inludes several different sounds and tunes.
Photo: Outgoing Phone Number Logger Kit Outgoing Phone Number Logger Kit
Recorder all outgoing dialed numbers on your phone with this electronic kit.
0 Comments - in Telephone
Electronic circuit that connects to phone line and produces and flashing LED and audible sound when there is an incoming call.