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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)
Door Phone Intercom - A simple 2 way Intercom based on the
LM386386 using 8 ohm speakers….(schematic / Circuit design added 9/02)
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)
Intercom Preamp - a convenient way of making an intercom is to use a
loudspeaker as a microph1(added 4/02)
Intercom with fader - Suitable for tandem bicycles and motor cycles. Connects
to iPod and similar MP3 audio players. (electronic diagram added 6/07)
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) [Site is underconstruction right now]
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)
