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Showing posts with label Telephone. Show all posts
Showing posts with label Telephone. Show all posts
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Telephone Ringer with 556 dual timers

Telephone Ringer with 556 dual timers Circuit diagramUsing articulate ellipsoidal after-effects of altered time periods, The ambit presented actuality produces campanology tones agnate to those produced by a telephone.The ambit requires four astable multivibrators for its working. Therefore two 556 ICs are acclimated here. The IC 556 contains two timers (similar to 555 ICs) in a distinct package
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Telephone DTMF Remote Control

The circuit is a remotely operated DTMF telephone. The circuit can be used to change up to 9 devices using the keys 0 to 9 phone. Digit 0 is used to switch between the phone system remotely and change the way of normal conversation. IC KT3170 (DTMF to BCD decoder) is used to decode DTMF signals transmitted through the telephone line to the corresponding BCD format. IC 74 154 (4 to 16
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