Telephones

Telephones

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		Cellular Phone calling Detector	View 185
		Flashes a LED when detecting an incoming call Powered by one 1.5V cell

The Link Telephone Intercom		The Link Telephone Intercom	View 206
		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 189
		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 154
		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 149
		Here is a telephone line vigilant circuit to guard against mis- use of your telephone lines.

		Telephone Headgear	View 116
		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 181
		The circuit shown here is used to switch on a lamp when the tele- phone rings, if the ambient light is insufficient.

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