Telephones

Telephones

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The Link Telephone Intercom		The Link Telephone Intercom	View 159
		The Link circuitry is simple and efficient, employing just two ICs, half a dozen transistors, and a handful of garden variety components.

		Off line Telephone tester	View 146
		Here is a circuit of an off-line telephone tester which does not require any telephone line for testing a telephone instrument.

		Audio Visual Ringer	View 115
		Many a times one needs an ex- tra telephone ringer in an ad- joining room to know if there is an incoming call.

		Telephone Line Vigilant	View 108
		Here is a telephone line vigilant circuit to guard against mis- use of your telephone lines.

		Telephone Headgear	View 88
		Acompact, inexpensive and low component count telecom head- set can be constructed using two readily available transistors and a few other electronic components.

		Smart Phone light	View 122
		The circuit shown here is used to switch on a lamp when the tele- phone rings, if the ambient light is insufficient.

		Telephone Number Display	View 126
		The given circuit, when connected in parallel to a telephone, dis- plays the number dialled from the telephone set using the DTMF mode.

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