Finished GC : Sweet & sour experience!!!

porfi4ever · 22nd July 2004, 11:24 PM

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!

22nd July 2004, 11:24 PM	#1
porfi4ever diyAudio Member Join Date: Dec 2002 Location: Providence,R.I	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.

23rd July 2004, 08:18 AM	#2
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	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. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

23rd July 2004, 07:34 PM	#6
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	I thought you were using Brian's board and not p2p circuit __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

24th July 2004, 12:00 AM	#8
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Those are fine. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

23rd July 2004, 07:10 PM	#3
porfi4ever diyAudio Member Join Date: Dec 2002 Location: Providence,R.I	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

23rd July 2004, 07:17 PM	#4
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	pin3 is the output (connects to + on binding posts), pin4 is V- (negative rail) , pin 1 is V+ __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

23rd July 2004, 07:21 PM	#5
porfi4ever diyAudio Member Join Date: Dec 2002 Location: Providence,R.I	Thanks Peter, I was a stupid. I connected to pin #4.

23rd July 2004, 11:34 PM	#7
porfi4ever diyAudio Member Join Date: Dec 2002 Location: Providence,R.I	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?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
I need help on a sweet project	mryoumans	Everything Else	3	16th April 2008 12:33 PM
Sweet tweeter	Guss	Multi-Way	12	6th July 2003 01:28 PM
Sweet! (Bag End InfraSub)	BAM	Subwoofers	5	13th January 2002 04:13 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read