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How to design a pre-amp using op-amp circuits
Old 24th August 2007
  #1
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How to design a pre-amp using op-amp circuits

For use of a 500W power bass amp, how would you create a suitable pre-amp where the 'pick up' has a DC resistance of 470kohms, an inductance of 2.2H and the load across the output of the preamp is 10kohms. 2V rms signal is needed to drive the amp at full volume and the freq. response is 30Hz - 1kHz. Can anybody help?
Old 24th August 2007
  #2
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Quote:
Originally Posted by jw00024 View Post
For use of a 500W power bass amp, how would you create a suitable pre-amp where the 'pick up' has a DC resistance of 470kohms, an inductance of 2.2H and the load across the output of the preamp is 10kohms. 2V rms signal is needed to drive the amp at full volume and the freq. response is 30Hz - 1kHz. Can anybody help?
470k source would need a low noise FET input, and/or a step up transformer followed by active electronics to get a better match for impedance.

If the voltage output from a lightly loaded (say several Meg Ohm termination) pickup is reasonably large, the transformer won't be needed to deliver good S/N.

So it might be as simple as a bifet opamp, depending upon source output voltage.

JR
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