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need simple microphone pre-amp opamp circuit

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
 
P

Phil Allison

Jan 1, 1970
0
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.


** Don't you mean the LF357 ?

Anyone have a simple circuit that will work with a single supply
powered op-amp?


** 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
 
W

Walter Harley

Jan 1, 1970
0
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?


Google for "opamp electret mic preamp" (without the quotes).
 
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