I have to throw together a simple op-amp based electret microphone pre-amp circuit on the road (limited access to hardware) - yes I feel like Mcguiver. I have access to a LM357 op-amp that I need to use with a single 6v supply. Anyone have a simple circuit that will work with a single supply powered op-amp? Thanks
** Don't you mean the LF357 ?
** Although this op-ap is not spaced by Natsemi to operate with less than +/- 5 volts supply - it will still function with reduced specs with a 6 volt single supply.
Just use a standard inverting amp stage and bias the + input to 3 volts.
Suggest the input resistor be 3.9 kohms and the feedback a 250k ohms pot.
....... Phil
Google for "opamp electret mic preamp" (without the quotes).
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