Parallel or Bridged 100watter - Page 3

usekgb · 29th November 2003, 04:16 AM

If you have slightly different gains, the amplifier won't be exactly balanced. You need to make absolutely sure that the gain of the inverting half is exactly the same as the gain on the non-inverting half. Otherwise one side will be pushing harder than the other. While this will still work, it won't sound nearly as good as a perfect balance.

Cheers,
Zach

Optical · 29th November 2003, 11:46 AM

Hmm, i see...

thanks

cybervagrant · 29th November 2003, 05:24 PM

If you get the resistors unmatched to tolerance and your using servos, the servos will have to work harder than they should to balance the output or prehaps fail to balance the output so that no current flow between the chips needless wasting output power. If your not using servos then there will be current flowing between the paralleled chips wasting power to the extent of the mismatch.

Optical · 30th November 2003, 01:05 AM

I wasnt planning on using the servos..
guess i'll be matching those parts as close as i can then!

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29th November 2003, 04:16 AM	#21
usekgb diyAudio Member Join Date: Feb 2003 Location: Salt Lake City, UT, USA	If you have slightly different gains, the amplifier won't be exactly balanced. You need to make absolutely sure that the gain of the inverting half is exactly the same as the gain on the non-inverting half. Otherwise one side will be pushing harder than the other. While this will still work, it won't sound nearly as good as a perfect balance. Cheers, Zach

29th November 2003, 11:46 AM	#22
Optical diyAudio Member Join Date: Nov 2002 Location: Auckland, New Zealand	Hmm, i see... thanks

29th November 2003, 05:24 PM	#23
cybervagrant diyAudio Member Join Date: May 2003 Location: Orlando, Florida	If you get the resistors unmatched to tolerance and your using servos, the servos will have to work harder than they should to balance the output or prehaps fail to balance the output so that no current flow between the chips needless wasting output power. If your not using servos then there will be current flowing between the paralleled chips wasting power to the extent of the mismatch.

30th November 2003, 01:05 AM	#24
Optical diyAudio Member Join Date: Nov 2002 Location: Auckland, New Zealand	I wasnt planning on using the servos.. guess i'll be matching those parts as close as i can then!

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