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Old 22nd February 2004, 06:05 PM   #11
Ryssen is offline Ryssen  Sweden
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Quote:
Biasing the op amp into class A with CCS at the o/p will give full o/p on one of the supply lines.
How is this done???
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Old 22nd February 2004, 07:22 PM   #12
mikelm is offline mikelm  England
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Quote:
Originally posted by ryssen

How is this done???
Actually the more I think about it the more I think I will stop thinking along these lines and focus more on the jocko/rudolf designs.

an example of how to bias op amps into class a is shown here.

http://www.diyaudio.com/forums/showt...129#post327129

This approach to the above cct would mean that all of the current cycle would be drawn from one leg but when I was thinking on how to best convert this to a voltage I quickly came back to the jocko homo grounded base I- V i/p stage which makes the chip rather redundant.

that's my halfpenny worth

mike
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Old 25th February 2004, 09:53 PM   #13
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Version with ccs. Works as does the one with transistor stage.
The output swings 5.5V to 9.5V.
What you all think ?

By the way if I put in NE5532 there are currents coming out of nowhere

Is it a bug in the spice model ?

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Old 25th February 2004, 11:46 PM   #14
mikelm is offline mikelm  England
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is that op amp stable without .1uF from the supply pins to earth ?

If not what do the caps to to the o/p frequency response ?

mike
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Old 26th February 2004, 07:10 AM   #15
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No idea, but one amp that I had built with output devices driven by op amp rails was stable even with fast cfb op amp.

Anyway the resistor can be mounted close to the op amp and so can be the decoupling cap.
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Old 28th February 2004, 08:07 PM   #16
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How about this one ?

Two inputs, each for one or more TDA1541.

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