Finished GC : Sweet & sour experience!!! - diyAudio
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Old 22nd July 2004, 11:24 PM   #1
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Default 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.
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Old 23rd July 2004, 08:18 AM   #2
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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.
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Old 23rd July 2004, 07:10 PM   #3
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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
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Old 23rd July 2004, 07:17 PM   #4
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pin3 is the output (connects to + on binding posts), pin4 is V- (negative rail) , pin 1 is V+
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Old 23rd July 2004, 07:21 PM   #5
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Thanks Peter, I was a stupid. I connected to pin #4.
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Old 23rd July 2004, 07:34 PM   #6
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I thought you were using Brian's board and not p2p circuit
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Old 23rd July 2004, 11:34 PM   #7
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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?
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Old 24th July 2004, 12:00 AM   #8
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Those are fine.
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Old 27th July 2004, 02:06 AM   #9
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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.
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Old 27th July 2004, 08:08 AM   #10
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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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