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  • Wireless Telephone Bug

    Here’s a neat little project that will allow you to monitor your phone line as soon as your phone is off hook. You can use a regular FM broadcast band radio to monitor the conversation. VN:F [1.6.9_936]please wait…Rating: 8.0/10 (2 votes cast)VN:F [1.6.9_936]Rating: +1 (from 3 votes)

  • FM Telephone Bug

    Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (execpt the dial tone) to any FM radio. The frequency can be tuned from 88 to about 94Mhz and the range is about 200 feet. It is extremely easy to build and is therefore a good, useful […]

  • The Link Telephone Intercom

    The Link circuitry is simple and efficient, employing just two ICs, half a dozen transistors, and a handful of garden variety components. It all runs on 12 volts and is easily assembled. You can have your own home intercom between the kitchen, the garage, the rumpus room and at your poolside ‘barby’ and all for […]

  • Off line Telephone tester

    Here is a circuit of an off-line telephone tester which does not require any telephone line for testing a telephone instrument. VN:F [1.6.9_936]please wait…Rating: 5.0/10 (2 votes cast)VN:F [1.6.9_936]Rating: 0 (from 2 votes)

  • Audio Visual Ringer

    Many a times one needs an extra telephone ringer in an ad-joining room to know if there is an incoming call. For example, if the telephone is installed in the drawing room you may need an extra ringer in the bedroom. VN:F [1.6.9_936]please wait…Rating: 0.0/10 (0 votes cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Telephone Line Vigilant

    Here is a telephone line vigilant circuit to guard against misuse of your telephone lines. VN:F [1.6.9_936]please wait…Rating: 0.0/10 (0 votes cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Telephone Headgear

    Acompact, inexpensive and low component count telecom head- set can be constructed using two readily available transistors and a few other electronic components. VN:F [1.6.9_936]please wait…Rating: 9.0/10 (1 vote cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Smart Phone light

    The circuit shown here is used to switch on a lamp when the telephone rings, if the ambient light is insufficient. The circuit uses only two ICs and it can be implemented very easily. VN:F [1.6.9_936]please wait…Rating: 0.0/10 (0 votes cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Telephone Number Display

    The given circuit, when connected in parallel to a telephone, dis- plays the number dialled from the telephone set using the DTMF mode. VN:F [1.6.9_936]please wait…Rating: 9.0/10 (1 vote cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Cordless phone backup

    Normally the base of a cordless phone has an adaptor and the handset has Ni-Cd cells for its operation. The base unit becomes inoperative in case of power failure. VN:F [1.6.9_936]please wait…Rating: 8.0/10 (1 vote cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)