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Telephone Circuits and Schematics

Charge your cell phone battery while in transport with this battery charging electronic circuit.
Detect incoming mobile phone calls with this schematic for a small electronic circuit that flashes an LED when it detects an incoming coil. Requires only 1.5 Volts DC.
You only have one telephone in your house, but you can't hear the phone from every room in your home? You want to be alerted whenever there's an incoming call, but if you can't hear the phone, what can you do?
Featuring two different types of telephone ring generators, two line "in-use" indicator circuits, and an audio interface circuit.