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Old 17th July 2005, 11:06 AM   #1
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Default OP-AMP based balanced horisontal amp....

Click the image to open in full size.
I saw some other op-amp biased fetamp so I thought I would post this one. No bias circuitry is drawn in the picture. Just the basic amp. As it is now it runs in class C. Not any sweetsounding but its just an idea.
Any thoughts or comments????
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Old 17th July 2005, 04:40 PM   #2
djk is offline djk
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Bias will be really tough unless you run class A or L-MOS.

B+ maximum for outputs is about 44V (about 60W/8R) for the OPA2604 running off ±24V.

Higher voltages may be used but it can get very complicated.
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Old 17th July 2005, 06:52 PM   #3
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Looks like Sumo Nine(+), except mosfet output, deseign by James Buongiorno.

http://photobucket.com/albums/v58/ap...rent=Sumo9.jpg
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Old 17th July 2005, 09:45 PM   #4
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Very much so except:

The variable bias scheme should not be tried with FETs.

The high voltage LF 353s were obtained by selection for ±20V. An OPA2604 sounds better and will work at ±24V without selection.

Bongiorno says the AD823 selected for ±20V use is even better.
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Old 18th July 2005, 12:58 AM   #5
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Check this out

Its an opamp driven N- channel vertical mosfet amplifier

http://www.qscaudio.com/support/library/schems/pl90.pdf
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Old 18th July 2005, 08:59 AM   #6
andreie is offline andreie  Estonia
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Why should bias be tough?

Perhaps the following completes the picture:
Click the image to open in full size.

This is a modifcation from a design in "Radio" August, 1984 issue, pages 35-37.

Don't ask about the sound, because I never got around building the first time I saw it and later I found Renardson's 7-transistor amplifier, which is technologically superior to DIY.
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