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19th August 2006, 11:32 AM
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#1 |
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diyAudio Member
Join Date: May 2003
Location: Between northpole and southpole
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OpAmps wired in parallel
Hi,
Since we can read everywhere that wiring converters (TDA1541, 1543) in parallel, as well as Chipamps (LM series, or the TDA7293) would be of a benefit (which I confirm), I wonder what would happen if we wire 2 or more OpAmps in parallel. What would be the theoretical benefit. I tried it with some cheapo devices (2114), so far I couldn't hear any difference towards better (difficult with those items removed from a cheap player), and they went hot, but withstood the heat a few hours, unitil I removed them. Has anybody experienced this? Will continue if I find a multiple of some better devices. - dan
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It is worth to keep your mouth shut and let people think you’re stupid; rather than to open it and thus eliminate any doubts... |
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19th August 2006, 12:03 PM
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#2 |
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diyAudio Member
Join Date: Jan 2004
Location: Split, Croatia
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You may have input, output and power supply pins in parallel, but you have to split feedback loops of each. And puting some balansing resistors at each opamp output is a good practise.
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Non é mai abbastanza... |
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19th August 2006, 12:54 PM
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#3 |
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diyAudio Member
Join Date: May 2003
Location: Between northpole and southpole
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Yes of course, I should have think about that!
Do you think with your suggested wiring I would have an impovement of sound?
__________________
It is worth to keep your mouth shut and let people think you’re stupid; rather than to open it and thus eliminate any doubts... |
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20th August 2006, 08:52 AM
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#4 |
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diyAudio Member
Join Date: Jan 2004
Location: Split, Croatia
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You would, in theory, but in practice I don't think so, in that particulare application. But, IMHO there is nothing that should stop you to find for yourself again, this time in a right way.
BTW, yours chips are hot becouse thay oscilates...
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Non é mai abbastanza... |
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20th August 2006, 09:17 AM
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#5 |
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Electrons are yellow and more is better!
diyAudio Member
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You can connect opamps in parallel in order to reduce noise and/or increase output power .... but.... not with just putting them in parallel
 It takes more than that I'm afraid. 
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/Per-Anders (my first name) or P-A as my friends call me |
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20th August 2006, 11:01 AM
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#6 |
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diyAudio Member
Join Date: May 2003
Location: Between northpole and southpole
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I will connect as aparatusonitus suggest, but this means I have to remove some components from the board and build an adapter to make dual feed back and load resistors.
When done, I'll let you know what the results would be. Cheers, - dan
__________________
It is worth to keep your mouth shut and let people think you’re stupid; rather than to open it and thus eliminate any doubts... |
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20th August 2006, 01:00 PM
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#7 |
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diyAudio Member
Join Date: Jun 2004
Location: japan
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Alfetta87 san kon-nichiwa
accuphase e-213, it's opamps in parallel use. http://www.accuphase.com/pdf/e-213_e.pdf |
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