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-   -   Finished GC : Sweet & sour experience!!! (http://www.diyaudio.com/forums/chip-amps/38291-finished-gc-sweet-sour-experience.html)

porfi4ever 22nd July 2004 11:24 PM

Finished GC : Sweet & sour experience!!!
 
Hi everybody, I just finished my GC base on Brian's Boards and Peter's chassis, but like the subject says it was a sweet and sour experience. Sweet, because the layout boards are wonderfull and the chassis is superb!!(this 2 guys are great) and sour because when I connect the amp to power, loud sound was coming from it. I took a reading of a dc offset and it was 34 dcv same reading after rectifier. I have a doubt and it is in my rca wiring with the grayhill switch, If I mess there could it be the cause of my problem. Please help me, I'm just a newbie.

Nuuk 23rd July 2004 08:18 AM

Check all your solder joints very carefully.
Make sure that you have the capacitors in the right way round.

It looks as though one of the voltage rails is broken somewhere between the output of the PSU section and the input pin of the chip.

Do not connect a speaker until the DC offset is under 100mV.

porfi4ever 23rd July 2004 07:10 PM

Thanks Nuuk for your response, think I found the problem, pin #3 is the one that goes connected to binding post +? if this is correct Ihave the FNB connected to pin #4. Am I correct? please

Peter Daniel 23rd July 2004 07:17 PM

pin3 is the output (connects to + on binding posts), pin4 is V- (negative rail) , pin 1 is V+

porfi4ever 23rd July 2004 07:21 PM

Thanks Peter, I was a stupid. I connected to pin #4.

Peter Daniel 23rd July 2004 07:34 PM

I thought you were using Brian's board and not p2p circuit;)

porfi4ever 23rd July 2004 11:34 PM

Yes, I'm using Brian's boards but got confused,then I connected the resistor to wrong pin but solved that problem, now I'm getting 48.6 mv for right channel and 52.2 mv for left ch. Are these readings fine?

Peter Daniel 24th July 2004 12:00 AM

Those are fine.

porfi4ever 27th July 2004 02:06 AM

Quote:

Originally posted by porfi4ever
Yes, I'm using Brian's boards but got confused,then I connected the resistor to wrong pin but solved that problem, now I'm getting 48.6 mv for right channel and 52.2 mv for left ch. Are these readings fine?

But after fixing a problem with a channel I'm getting 13.5 and 10 mv , are they ok? Amp is playing wonderfully!! It is dead quiet. No pic right now, having problem with browser.

Nuuk 27th July 2004 08:08 AM

Quote:

But after fixing a problem with a channel I'm getting 13.5 and 10 mv , are they ok?
Yes, absolutely fine. All's well that ends well. Happy listening! ;)


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