MUNEEB399 Posted February 13, 2010 Report Share Posted February 13, 2010 I have assigned to make an intercommunication system. Can any one give me the complete circuit that work at 9 or 12 volt. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted February 13, 2010 Report Share Posted February 13, 2010 No but we are willing to help you design the circuit yourself.Anyway, you haven't provided enough information. Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 14, 2010 Report Share Posted February 14, 2010 A cheap very old intercom is half-duplex. I press a button to speak and you hear it. But while I am pressing the button it disconnects your microphone so I can't hear you.If you speak then you press your button that disconnects my microphone. So you cannot hear me.Full-duplex allows each person at each end to always hear the other end but is a little more complicated. It can cancel its own signal or it can use a modern digital echo canceller circuit. Quote Link to comment Share on other sites More sharing options...
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