preamp configuration

audiofan · 29th November 2007, 06:58 PM

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

audiofan · 29th November 2007, 07:00 PM

sorry......... here is the circuit...

audiofan · 4th December 2007, 06:41 PM

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....

Leolabs · 5th December 2007, 01:22 AM

DC output offset/drift???

audiofan · 5th December 2007, 03:21 PM

Ofset is corrected with potentiometer, no test have been done yet for drift or distortion.

29th November 2007, 06:58 PM	#1
audiofan diyAudio Member Join Date: May 2003 Location: quebec	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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5th December 2007, 01:22 AM	#4
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	DC output offset/drift???

5th December 2007, 03:21 PM	#5
audiofan diyAudio Member Join Date: May 2003 Location: quebec	Ofset is corrected with potentiometer, no test have been done yet for drift or distortion.

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