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8 Line Intercommunication using 89c51 - ….(design added 08/08) |
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Creating Your Own Telephone Ne2 Rk - you can easily create your own intercom
system using two telephones, a 9-volt battery (or some other simple power supply) and
a300-ohm resistor (added 4/02) |
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Door Phone Intercom - (schematic / circuit design added 9/02) |
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Full-Duplex Intercom - No complex switching required Simple circuitry, 6-12V
supply (added 3/05) |
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Head Set Intercom - (diagram added 6/03) |
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High Quality Intercom mitedu - (electronic design added 10/06) |
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IFB Intercom - (diagram added 6/03) |
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Intercom (Randy Linscott) - This circuit was requested by an school teacher. It is
a simple intercom that anyone can put together and get to work. It is based on the
LM380 IC chip. This chip is able to put out 2 watts of power if it is heat sink
properly. The following pins ….(added 04/05/06) |
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Intercom Preamp - a convenient way of making an intercom is to use a loudspeaker
as a microph1(added 4/02) |
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Intercom Schematic - (electronic circuit added 4/05) |
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Intercom with fader - Suitable for tandem bicycles and motor cycles. Connects to
iPod and similar MP3 audio players. (electronic diagram added 6/07) |
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InterCommunication - This is a great intercom circuit that can be used in many
ways. It uses 22V to operate and maybe it will work at a lower voltage (you can try
it). For input/output it uses a loundspeaker (20-45 Ohm) on each side….(circuit
diagram added 09/08) |
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Low cost intercom using transistors - .... (added 10/05) |
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Low Cost Transistorised Intercom - (electronic Circuit / Schematic added 10/04) |
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Low Power Op Amp Audio Amp Intercom - The example below illustrates using an
op-amp as an audio amplifier for a simple intercom. A small 8 ohm speaker is used as a
microphone which is coupled to the op-amp input through a 0.1uF capacitor. The speaker
is sensitive to low frequencies and the small value capacitor serves to attenuate the
lower tones and produce a better overall response. You can experiment with different
value capacitors to improve the response for various speakers. The op-amp voltage gain
is determined by the ratio of the feedback resistor to the series input resistor which
is around one thousand in this case... (electronic circuit added 7/03) |
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Old Telephones as Intercom - (electronic Circuit diagram added 03/03/03) |
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Old Telephones as Intercom (Markus Wandel) - ASCII format (added 8/03) |
