Can a 741 opamp be used to generate a negative voltage? I need to get the ouput of a dynamic mic and generate a negative voltage. If the input of the dynamic mike is 1 volt I need it to be -1. Can this be done with the 741 opamp? Is this the same as an inverting amp?

 

Yes, assuming that the 741 has a negative power supply! Example +5 volts and –5 volts.
This is an example of an inverting amplifier.

 

hi,
As its an ac coupled amp, you can offset the opa input using a resistive potential divider.
example: if the supply to the 741 is say +12v, set the +Vin of the 741 using a pair of resistors, to +6v.

Search this forum for ac amplifiers.

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Eric
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Check at http://www.analog.com for ADM8828.

It's a switched capacitor inverter. It works from +1.5 to +5.5 and can deliver a max current of 25mA. Needs two external 1µF caps only.

Boncuk

 

I think you need to give more details, your current question makes no sense?.

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