Amplifier-upgrade from 4 to 8 om

matic · 28th August 2006, 09:51 PM

I want this amplifier change so that it can run on 2x56Volt. What must be changed except R11,12,13 and14? And of course i would put 2N3773 or so...

darkfenriz · 28th August 2006, 10:47 PM

R13 and R14 should not be changed. You can make workable amplifier with 3 pairs of 3773, but this design is awful, best to try something competent than play with this 5HI+.

matic · 29th August 2006, 03:55 PM

I know that this is not some nice amplifier but for the curent project it is more then enough. I had amplifier with similar design but don't have the schematic, it had +-52volts.

nonik · 29th August 2006, 06:53 PM

Better use an industry schematic.

http://www.qsc.com/support/library/s...ies/usa370.pdf

A bit strange but proven to be reliable and short-circuit proof.

Andre

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28th August 2006, 10:47 PM	#2
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	R13 and R14 should not be changed. You can make workable amplifier with 3 pairs of 3773, but this design is awful, best to try something competent than play with this 5HI+.

29th August 2006, 03:55 PM	#3
matic diyAudio Member Join Date: Apr 2005 Location: Subotica	I know that this is not some nice amplifier but for the curent project it is more then enough. I had amplifier with similar design but don't have the schematic, it had +-52volts.

29th August 2006, 06:53 PM	#4
nonik diyAudio Member Join Date: Jan 2004 Location: Rijckholt	Better use an industry schematic. http://www.qsc.com/support/library/s...ies/usa370.pdf A bit strange but proven to be reliable and short-circuit proof. Andre

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