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Old 29th November 2007, 06:58 PM   #1
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Default preamp configuration

Is there any hope with this configuration ?
The use of the OP AMP has 3 goals

- reduce load on VAS
- reduce distortion of output stage
- reduce thermal drift
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Old 29th November 2007, 07:00 PM   #2
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sorry......... here is the circuit...
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Old 4th December 2007, 06:41 PM   #3
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I had some spare time an I made a test .
Circuit works fine for first evaluation on a 20KHz square wave had no overshoot and a rise time of 1.8uS.
complete circuit below....
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Old 5th December 2007, 01:22 AM   #4
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DC output offset/drift???
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Old 5th December 2007, 03:21 PM   #5
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Ofset is corrected with potentiometer, no test have been done yet for drift or distortion.
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