opamp input based power amps

sparkle · 8th May 2007, 06:08 AM

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

sparkle · 8th May 2007, 11:55 AM

Symon · 8th May 2007, 12:50 PM

Take a look at this

http://www.pi.infn.it/~federico/PSE.htm

sparkle · 8th May 2007, 03:10 PM

thank You Symon....

anybody else?

Chucko · 8th May 2007, 06:09 PM

QSC Audio uses NE5532 chips in the front ends of many of their PA style power amps. See the support area for PDF schematics.

paulb · 8th May 2007, 06:31 PM

http://sound.westhost.com/project76.htm

Minion · 8th May 2007, 07:09 PM

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

AKN · 8th May 2007, 07:31 PM

Hi,

See also this earlier thread

Bone · 8th May 2007, 08:08 PM

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

sparkle · 8th May 2007, 08:25 PM

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

8th May 2007, 06:08 AM	#1
sparkle diyAudio Member Join Date: Oct 2003 Location: middle of nowhere...	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

8th May 2007, 07:31 PM	#8
AKN Enjoy good sound diyAudio Member Join Date: Aug 2005 Location: In the middle of Sweden	Hi, See also this earlier thread __________________ / Anders

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8th May 2007, 11:55 AM	#2
sparkle diyAudio Member Join Date: Oct 2003 Location: middle of nowhere...

8th May 2007, 12:50 PM	#3
Symon diyAudio Member Join Date: Mar 2002 Location: Herts, UK	Take a look at this http://www.pi.infn.it/~federico/PSE.htm

8th May 2007, 03:10 PM	#4
sparkle diyAudio Member Join Date: Oct 2003 Location: middle of nowhere...	thank You Symon.... anybody else?

8th May 2007, 06:09 PM	#5
Chucko diyAudio Member Join Date: Jan 2002 Location: Silicon Valley, CA, USA	QSC Audio uses NE5532 chips in the front ends of many of their PA style power amps. See the support area for PDF schematics.

8th May 2007, 06:31 PM	#6
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	http://sound.westhost.com/project76.htm

8th May 2007, 07:09 PM	#7
Minion diyAudio Member Join Date: May 2006	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

8th May 2007, 08:08 PM	#9
Bone diyAudio Member Join Date: Jun 2004 Location: Dorset, UK	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

8th May 2007, 08:25 PM	#10
sparkle diyAudio Member Join Date: Oct 2003 Location: middle of nowhere...	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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