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Telephone Line Vigilant

dolphin 2009-08-25

Here is a telephone line vigilant circuit to guard against mis- use of your telephone lines. It monitors telep......

Telephone Vigilant

Remote control using telephone

dolphin 2009-08-25

Here is a teleremote circuit which enables switching 憃n?and 憃ff?of appliances through telephone lines. It can ......

Remote control using telephone

Telephone Number Display

dolphin 2009-08-25

The given circuit, when connected in parallel to a telephone, dis- plays the number dialled from the telephone......

Telephone Number Display

Telephone Headgear

dolphin 2009-08-25

Acompact, inexpensive and low component count telecom head- set can be constructed using two readily available......

Telephone Headgear

Telephone Ringer using 556 dual timers

dolphin 2009-08-25

Using modulated rectangular waves of different time periods, The circuit presented here produces ringing tones......

Telephone Ringer using timers

Two line intercom plus a telephone changeover switch

dolphin 2009-08-25

The circuit presented here can be used for connecting two telephones in parallel and also as a 2-line intercom......

intercom telephone changeover

Remote control using telephone

dolphin 2009-08-25

Here is a teleremote circuit which enables switching 憃n?and 憃ff?of appliances through telephone lines. It can ......

Remote control using telephone

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