jakoy00 Posted April 7, 2009 Report Share Posted April 7, 2009 which one is more reliable amplifier?can this will work?because i don't know how to simulate it and i want to be sure that it is working before i buy the components..or give me another simple circuit about mic pre amplifier.thanks! Quote Link to comment Share on other sites More sharing options...
audioguru Posted April 7, 2009 Report Share Posted April 7, 2009 Hi Jakoy,Welcome to our forum. ;DThe very old transistors mic preamp has a fairly high distortion at high levels and the 1k resistor that powers the mic should be decoupled from the supply and should be 10k.The intercom circuit uses a noisy (hissss) LM386 power amp instead of a low noise opamp.I like this low noise opamp circuit for an electret mic preamp: Quote Link to comment Share on other sites More sharing options...
jakoy00 Posted April 7, 2009 Author Report Share Posted April 7, 2009 sir is this really a working circuit?if i do the circuit you've shown can i use TL071CP for the op-amp?and can i use an 8-ohm 1w speaker for the output?for the potentiometer, can i use an ordinary potentiometer?and i posted a picture of the electret mic. does electret mic has polarity?c2,c3,c4 are electrolytic right? what is their voltage rating?and for the resistors are they 1/4W?sorry for the many questions sir. Quote Link to comment Share on other sites More sharing options...
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