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Telephone and Intercom projects

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Isolated Telephone Interface

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.

http://www.solorb.com/elect/phone/tap/index.html

Wire Color Codes

Wire Color Codes

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

http://www.homephonewiring.com/clr-code.html

Adding a Second Line to Your Existing Phone Jacks

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.

http://www.homephonewiring.com/add-line2.html

Inductive Telephone Tap

Inductive Telephone Tap

http://www.unterzuber.com/tap.html

9-Line Telephone Sharer

9-Line Telephone Sharer

http://www.electronicsforu.com/efylinux/circuit/feb2001/cir1.htm

Parallel Telephones with Secrecy

Parallel Telephones with Secrecy

http://www.electronicsforu.com/efylinux/circuit/jun2000/cir1.htm

Telephone Circuits

Telephone Circuits

http://www.techlib.com/electronics/telephone.html

Telephone Line Based Audio Muting and Light-On Circuit

Telephone Line Based Audio Muting and Light-On Circuit

http://www.electronicsforu.com/efylinux/circuit/jul2000/cir1.htm


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