Isolated Telephone Interface

This circuit allows you to record audio from a telephone line into a tape recorder or computer soundcard. Most of the parts for this circuit can be scrounged from an old modem, with some work, it is possible to rewire the modem circuitry and use the old modem case.

Wire Color Codes

Advice for home phone wiring and jacks with information at adding second or third line and reference for wire color codes.

Adding a Second Line to Your Existing Phone Jacks

Advice for home phone wiring and jacks with information at adding second or third line and reference for wire color codes.

Inductive Telephone Tap

9-Line Telephone Sharer

Parallel Telephones with Secrecy

Telephone Circuits

Telephone Line Based Audio Muting and Light-On Circuit