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Old 8th May 2007, 06:08 AM   #1
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Question opamp input based power amps

i remember i found few years ago some amplifiers that have inputs based on opamp's .....also some of the opamps were bootstrapped to increase the voltage swing....

does anyone have high quality schematics of power amplifiers that have opamp in the input - preferably bootstrapped and they could have mosfets or bjt at the output doesn't matter....power needed 50-100W /8ohm....
regards
daniel
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Old 8th May 2007, 11:55 AM   #2
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Old 8th May 2007, 12:50 PM   #3
Symon is offline Symon  United Kingdom
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Take a look at this

http://www.pi.infn.it/~federico/PSE.htm
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Old 8th May 2007, 03:10 PM   #4
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thank You Symon....

anybody else?
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Old 8th May 2007, 06:09 PM   #5
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QSC Audio uses NE5532 chips in the front ends of many of their PA style power amps. See the support area for PDF schematics.
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Old 8th May 2007, 06:31 PM   #6
paulb is offline paulb  Canada
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http://sound.westhost.com/project76.htm
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Old 8th May 2007, 07:09 PM   #7
Minion is offline Minion  Canada
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Or this one (18w into 8ohms or 30w into 4ohms)


http://www.redcircuits.com/Page1.htm


Or this one(10w):

http://www.redcircuits.com/Page61.htm
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Old 8th May 2007, 07:31 PM   #8
AKN is offline AKN  Sweden
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Hi,

See also this earlier thread
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Old 8th May 2007, 08:08 PM   #9
Bone is offline Bone  United Kingdom
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Here's one with PCB and alternative BJT and MOS versions - http://skory.gylcomp.hu/25wamp/25wamp.html
With the right heatsink you can get over 40w from one of these


Tony
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Old 8th May 2007, 08:25 PM   #10
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oh man - thank You all.....nice - a lot of nice schematics....
anybody else that have something nice to contribute here is very welcomed.....
thank You again...
high quality is my priority
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