Phone In Use Indicator

Telephone Hold Button

Although a hold feature is standard on most new phones, a lot of us still use the origional bell phones. Those of us that require a hold feature will find this circuit very useful. It is easy to build, and is compact enough to be installed inside the phone with no real problem. It is also powered by the phone line itself, eliminating the need for batteries.

Telephone Line Based Audio Muting and Light-On Circuit

Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus miss an important incoming phone call. To overcome this situation, the circuit presented here can be used.

Telephone line surge protection

Telephone lines are long copper wires from central office to your apartment. Usually those wires are between few hundred meters to few kilometers.

Telephone privacy adapter

revents other telephones from hearing your call and disturbing your modem connection.