High voltage Opamp with power transistors

sivan_and · 30th December 2008, 05:34 AM

Hello all..
I have a couple of high voltage opamps like BurrrBrown 3583JM lying around..these r capable of high voltage upto (+) & (-) 140 volts and load currents upto (+) & (-) 75ma..i am thinking of adding some transistor drivres to boost current..the idea is to use as a sub amp with an output of around 200 to 300 watts...any suggestions ?
thx in advance

sivan_and · 30th December 2008, 07:06 AM

http://www.electro-tech-online.com/a...put-opampb.gif

jaycee · 30th December 2008, 08:21 AM

To be honest, by the time you have gone so far as to add the neccesary output stage to an opamp, you may as well have built a fully discrete power amplifier.

sakis · 30th December 2008, 11:03 AM

there is similar applications also related with lm 12clk .....

i wonder why they exist in the books ....there is got to be a reason

all these circuits look so simple to construct so if your target is simplicity ,power and average quality i dont see any reason why not ....

i dlike to work on this a bit more

i recall the lm12 application saying 90 volts swing and +- 10 amps ... thats a hell of a lot of power .....

i thing i will have to construct to see what is going on there

sakis · 31st December 2008, 02:31 PM

this but no replies ....

its been in the forum before ....i wonder why ???

woody · 31st December 2008, 02:57 PM

That circuite is not a power amp. It is intended to drive a 2,000ohm load not a loudspeaker. Few people need a line
stage that will swing that kind of voltage.

av-trouvaille · 31st December 2008, 03:23 PM

Hello,

Many years ago in the French diy magazine LED (now integrated with Electronique Pratique) there used to be a series of articles with such a design for power amplifiers. The high voltage IC directly drove one high voltage transistor or MOSFET (the ‘real’ class A, some say), which was biased by a currents source.
These designs were highly regarded for the way they sounded. On the site of Bonavolt there used to be a copy of such a design, but I did not visit it lately.

Best, Arjen.

Juergen Knoop · 31st December 2008, 03:24 PM

LM12 and LF357 are low voltage opamps.
How do their applications apply (LOL!) to the BB type?

Those BBs are expensive. I would sell them.
Regards

scott wurcer · 31st December 2008, 03:32 PM

Quote:

Originally posted by sivan_and
http://www.electro-tech-online.com/a...put-opampb.gif

That intermediate stage is full class B I don't think it would be too good for audio. These things are often used to drive electrostatic actuators.

Juergen Knoop · 31st December 2008, 04:07 PM

Quote:

Originally posted by scott wurcer
These things are often used to drive electrostatic actuators.

exactly what we used the BB for in the past. Then we switched to Apex which was cheaper.
regards

30th December 2008, 05:34 AM	#1
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	High voltage Opamp with power transistors Hello all.. I have a couple of high voltage opamps like BurrrBrown 3583JM lying around..these r capable of high voltage upto (+) & (-) 140 volts and load currents upto (+) & (-) 75ma..i am thinking of adding some transistor drivres to boost current..the idea is to use as a sub amp with an output of around 200 to 300 watts...any suggestions ? thx in advance __________________ SivanandBalan

30th December 2008, 11:03 AM	#4
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	come on guys .... there is similar applications also related with lm 12clk ..... i wonder why they exist in the books ....there is got to be a reason all these circuits look so simple to construct so if your target is simplicity ,power and average quality i dont see any reason why not .... i dlike to work on this a bit more i recall the lm12 application saying 90 volts swing and +- 10 amps ... thats a hell of a lot of power ..... i thing i will have to construct to see what is going on there __________________ SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

31st December 2008, 02:31 PM	#5
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	many people seen this but no replies .... its been in the forum before ....i wonder why ??? __________________ SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

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30th December 2008, 08:21 AM	#3
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	To be honest, by the time you have gone so far as to add the neccesary output stage to an opamp, you may as well have built a fully discrete power amplifier.

31st December 2008, 02:57 PM	#6
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	That circuite is not a power amp. It is intended to drive a 2,000ohm load not a loudspeaker. Few people need a line stage that will swing that kind of voltage.

31st December 2008, 03:23 PM	#7
av-trouvaille diyAudio Member Join Date: Aug 2003 Location: Near Rotterdam	Hello, Many years ago in the French diy magazine LED (now integrated with Electronique Pratique) there used to be a series of articles with such a design for power amplifiers. The high voltage IC directly drove one high voltage transistor or MOSFET (the ‘real’ class A, some say), which was biased by a currents source. These designs were highly regarded for the way they sounded. On the site of Bonavolt there used to be a copy of such a design, but I did not visit it lately. Best, Arjen.

31st December 2008, 03:24 PM	#8
Juergen Knoop diyAudio Member Join Date: Jan 2007 Blog Entries: 3	LM12 and LF357 are low voltage opamps. How do their applications apply (LOL!) to the BB type? Those BBs are expensive. I would sell them. Regards

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