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T O P I C    R E V I E W
Stick789 Posted - Sep 29 2009 : 12:48:14 PM
Great Site..Looking for a simple hardwired 2 or 3 station intercom schematic...can't buy them anymore..Thanks
2   L A T E S T    R E P L I E S    (Newest First)
audioguru Posted - Dec 14 2009 : 10:55:15 AM
quote:
Originally posted by bobo

hello there... in past year. i made intercom from ic LM386 and tr c828. i was happy that day :-). you can buy PCB at store and the schematic too.

You do not need a transistor preamp.
The LM386 has a gain of 200 if you add a single capacitor to its circuit as shown in its datasheet. Then it has plenty of gain to amplify a microphone. Each end needs a double throw "push-to-talk" switch that connects their speaker to the wires at rest and disconnects their speaker from the wires and connects their amplifier output instead when they push the switch.

With the speakers connected together at rest, I wonder if one speaker will be a microphone and the other speaker might produce a low sound if a person is screaming at the other speaker??
bobo Posted - Dec 14 2009 : 02:15:57 AM
hello there... in past year. i made intercom from ic LM386 and tr c828. i was happy that day :-). you can buy PCB at store and the schematic too.

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