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Old 28th July 2004, 12:00 PM   #11
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????
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Old 28th July 2004, 03:50 PM   #12
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OliverD: i have to agree with you!

This design is simply not very good.....!

Also when considering that when you change to another op-amp you may sacrifice stability if the output of the op-amp (like you said) doesnt like high capacitances on the Gate's in the (increasing number of) power MOSFET's.
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Old 28th July 2004, 04:12 PM   #13
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Instead of doing that, just use a LM3886 by itself or with a mosfet output stage.

The LM3886 by itself will handle rails up to 42v and currents up to 11 amps. Bootstrapping it is also an option to get higher voltage swings from an opamp.
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Old 28th July 2004, 05:10 PM   #14
Gaucho is offline Gaucho  Canada
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Consider this IRF design: AN-948

http://www.irf.com/product-info/audi...oappnotes.html
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Old 28th July 2004, 07:46 PM   #15
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Quote:
Originally posted by xplod1236
Instead of doing that, just use a LM3886 by itself or with a mosfet output stage.

The LM3886 by itself will handle rails up to 42v and currents up to 11 amps. Bootstrapping it is also an option to get higher voltage swings from an opamp.

and how i connect to the tlm3886 to mosfet to get high power??!
it is interesting......and if it is good i will build this.

tamir
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Old 29th July 2004, 01:47 AM   #16
jcx is offline jcx  United States
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TDA7293 is mosfet chip amp designed to be paralleled

for high power a bridge/parallel combo should be easy
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Old 29th July 2004, 07:08 AM   #17
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but i dont want to us only with OPamp.
i want to build amp with transistors ! like IRF540 / 9540.

there is more simple amps design with IRF540/9540 ?
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Old 29th July 2004, 07:47 AM   #18
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what with this ??

it is amp with OPA445

in zip file.
Attached Files
File Type: zip new.zip (9.5 KB, 222 views)
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Old 29th July 2004, 08:31 AM   #19
PMA is offline PMA  Europe
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The circuit you mention in
http://www.diyaudio.com/forums/showt...529#post447529
was shown only as an example for the thread where originally not working circuit was shown in the beginning. It is not intended as a project and never was realized, only simulated.
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Old 29th July 2004, 08:50 AM   #20
sonnya is online now sonnya  Denmark
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Quote:
Originally posted by Dj BASS AMP
what with this ??

it is amp with OPA445

in zip file.

Start turn the diodes 180 degress. Else you will not a have prober bias system
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