audioguru Posted April 22, 2006 Report Share Posted April 22, 2006 the 741 inverter circuit in this also works without a batteryIt doesn't work with its inputs at the negative supply voltage, and it has many other problems. So the 741 works like a piece of wire.The LM386 amp has a gain of 200, which is plenty. Try the coil connected like this: Quote Link to comment Share on other sites More sharing options...
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