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Old 9th September 2004, 09:12 AM   #1
polsol is offline polsol  South Africa
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Default OPAMP with Transistor Output

Anyone any recomendations for a power amp using low power op-amps driving conventional transistor)s) output stage?
Links to any available designs would be much appreciated.

Regards,
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Old 9th September 2004, 10:24 AM   #2
mik is offline mik
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http://audio.lukar.net/forum_wpisy.h...mat=5755&all=1

http://shell.sinuspl.net/~igod/pdf.zip_ password is abcd1
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Old 9th September 2004, 11:08 AM   #3
mandat is offline mandat  Poland
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Here you are the recent address of this forum.

http://www.audiostereo.pl/forum_wpis...mat=5755&p=5#k

When you want to know another projects of this author press the links below.
http://www.q-audio.pl/
http://q-audio.dis.pl/gallery/
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Old 9th September 2004, 11:29 AM   #4
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maybe you guys read the question wrongly...but he wanted BJTs as outputs...not MOSfets...hmmm but it does seem interesting though...there were some posts by Circltron on Current damping afterburners on Power opamps...
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Old 9th September 2004, 11:44 AM   #5
mandat is offline mandat  Poland
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>li_gangyi
Hey Mr, look at the gallery and you find such a project, too.
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Old 9th September 2004, 12:08 PM   #6
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since we're on this topic...I wanted to ask if there is any possibility of power outputs of over 200W...into 4 ohms that is...using this kinda configuration...
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Old 9th September 2004, 02:13 PM   #7
mandat is offline mandat  Poland
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Specification of the amp mentioned by mik.

PSU: +/- 28V,
gain: +41V/V
load: 4 Ohm
quiscent current:120mA
THD+N: 0.008% (22Hz to 22kHz, P =1 to 10W)
THD+N: 0.014% (22Hz to 22kHz, P = 11 to 40 W)
THD+N: 0.6% (22Hz to 22kHz, P = 41 to 75W)
SR: +22/-18V/us

About a specification of other amps from mentioned gallery you should mail to dariuszkulesza@wp.pl
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Old 11th September 2004, 05:39 AM   #8
polsol is offline polsol  South Africa
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Thanks for the info. Unfortunately i don't speak Polish but have still managed to glean some info.
I have also found an Amp on the ESP site plus "Op-Amp Boosters" are also covered in an application note on the National Semiconductor site plus I found an old JLH reference in his articles in ETI 1986 (from memory).
As for power output, this is limited by the drive capability of the opamp (available output current and voltage swing) i would imagine.
The reason for looking into this aspect of amp design is that I'm not too happy with trying to use a "one chip" power amp as i don't think that the thermal properties of the chip/heat sink would be too good and BJT's should be better. Also using a "front end" of known characteristics allows one to then look at the ouput current gain topology more closely.
Regards
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Old 8th February 2007, 02:47 PM   #9
tino96 is offline tino96  Italy
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Quote:
Originally posted by mandat
Here you are the recent address of this forum.

http://www.audiostereo.pl/forum_wpis...mat=5755&p=5#k

When you want to know another projects of this author press the links below.
http://www.q-audio.pl/
http://q-audio.dis.pl/gallery/

damn.. q-audio links are both dead....
I've found new realase of project.
unfortunately I don't speak Polish...
someone have info, PCB and docs about this very interesting project?
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Old 8th February 2007, 03:56 PM   #10
tino96 is offline tino96  Italy
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re-arranged...: good http://forum.akustyka.info/viewtopic...hlight=drakula
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