What the heck have I done..!?

lazyfly · 24th August 2004, 02:45 AM

Hi forum.

I've wired up the + - rails on a BrianGT GC and all rail voltages are spot on (25+25 transformer - 36V rails on both modules).

Now, one channel produces 58mV at the output whereas the other channel is producing 35.5V!!!!! What the?

Please help

lazyfly · 24th August 2004, 03:22 AM

hmmm, don't know if this will help but measuring in Ohms across pins 3 & 8 (nfbr) I get 21.9k and the working channel is the same. When I measure across pins 3 & 7 I get 0k on the dodgey chan and 44.5k on the working channel.

aHobbit · 24th August 2004, 05:15 AM

If you get 0 ohm between pin3 and pin7, it looks like you have a short circuit between pin 3 and the V+ rail of your supply. Thus, you will have 35.5Vdc at your speaker output terminal.

check carefully that no stray wire or whatever connects your V+ and the pin3.

regards.

Nuuk · 24th August 2004, 09:27 AM

This is also a symptom of one 'broken' rail. So check that you have the correct voltages on each pin of the chip.

24th August 2004, 02:45 AM	#1
lazyfly diyAudio Member Join Date: Jun 2004 Location: Melbourne	What the heck have I done..!? Hi forum. I've wired up the + - rails on a BrianGT GC and all rail voltages are spot on (25+25 transformer - 36V rails on both modules). Now, one channel produces 58mV at the output whereas the other channel is producing 35.5V!!!!! What the? Please help

24th August 2004, 09:27 AM	#4
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	This is also a symptom of one 'broken' rail. So check that you have the correct voltages on each pin of the chip. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

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24th August 2004, 03:22 AM	#2
lazyfly diyAudio Member Join Date: Jun 2004 Location: Melbourne	hmmm, don't know if this will help but measuring in Ohms across pins 3 & 8 (nfbr) I get 21.9k and the working channel is the same. When I measure across pins 3 & 7 I get 0k on the dodgey chan and 44.5k on the working channel.

24th August 2004, 05:15 AM	#3
aHobbit diyAudio Member Join Date: Jun 2004 Location: Quezon City	If you get 0 ohm between pin3 and pin7, it looks like you have a short circuit between pin 3 and the V+ rail of your supply. Thus, you will have 35.5Vdc at your speaker output terminal. check carefully that no stray wire or whatever connects your V+ and the pin3. regards.

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