Help diagnosing B1 Build (newbie)

dasfreak · 28th November 2010, 05:56 AM

Had my B1 all built and looking pretty good but after hooking up a dual gang pot and trying to avoid wiring the CW/CCW around the wrong way across both channels, I still managed to get it back to front!
Anyway, I've gone and done something odd and the board is currently dead where it was working before.

I've got 24v feeding into it. Putting the multimeter across +ve and ground I can see 24v reaching the board. If I put the +ve probe on the C1 side of R1, I'm not picking up any voltage. I want to make the assumption that I've done something odd to R1 which is a Vishay 3W/1ohm wirewound.

Not sure where I've gone wrong as the volume pot was all I was tinkering with unless I've managed to short something along thew way

Any pointers gratefully received

Cheers,
Graeme

lykkedk · 28th November 2010, 06:26 AM

Actually it's a sortoff simple circuit, i am sure you will get it to work again

Can you perhaps, take som pictures (Top and bottom), maybe make a drawing of the way, you attached to potmeter ?

Jesper.

dasfreak · 28th November 2010, 10:08 PM

Simple is my middle name!

I'm actually using the passdiy PCB so nothing unusual there - not sure if you'd still like a photo.

Pot is wired the same as B-1 assembly, Pass boards and PEC pots but on a dual gang.

Not sure if it's the pot or not. It's the lack of voltage that's got me worried.

Cheers,
Graeme

lykkedk · 29th November 2010, 03:23 AM

I assume you mean 18VDC PSU ?

Anyway, if the board was working before, sure something had happend now.

Before soldering another R1 onto the board, be sure that your'e PSU is working with 18VDC !

Actually i don't think, that you can destroy something, attaching the pots wrong.

Jesper.

budwiser · 30th November 2010, 01:56 AM

Should be ok with 24vdc. Build document says 18 to 24. Check to see if your R1 is still ok.

28th November 2010, 05:56 AM	#1
dasfreak diyAudio Member Join Date: Aug 2010 Location: Sydney	Help diagnosing B1 Build (newbie) Had my B1 all built and looking pretty good but after hooking up a dual gang pot and trying to avoid wiring the CW/CCW around the wrong way across both channels, I still managed to get it back to front! Anyway, I've gone and done something odd and the board is currently dead where it was working before. I've got 24v feeding into it. Putting the multimeter across +ve and ground I can see 24v reaching the board. If I put the +ve probe on the C1 side of R1, I'm not picking up any voltage. I want to make the assumption that I've done something odd to R1 which is a Vishay 3W/1ohm wirewound. Not sure where I've gone wrong as the volume pot was all I was tinkering with unless I've managed to short something along thew way Any pointers gratefully received Cheers, Graeme

28th November 2010, 06:26 AM	#2
lykkedk diyAudio Member Join Date: Dec 2002 Location: Denmark, Fredericia	Actually it's a sortoff simple circuit, i am sure you will get it to work again Can you perhaps, take som pictures (Top and bottom), maybe make a drawing of the way, you attached to potmeter ? Jesper. __________________ DIYAudio crazy.... LeachAmp, PearlPhono, Pumpkin, F4 DualMono, DDDac, HalfChang Spk., LinuxAudio, Squeezebox substitute, Drek inductorloaded pre-amp.

29th November 2010, 03:23 AM	#4
lykkedk diyAudio Member Join Date: Dec 2002 Location: Denmark, Fredericia	I assume you mean 18VDC PSU ? Anyway, if the board was working before, sure something had happend now. Before soldering another R1 onto the board, be sure that your'e PSU is working with 18VDC ! Actually i don't think, that you can destroy something, attaching the pots wrong. Jesper. __________________ DIYAudio crazy.... LeachAmp, PearlPhono, Pumpkin, F4 DualMono, DDDac, HalfChang Spk., LinuxAudio, Squeezebox substitute, Drek inductorloaded pre-amp.

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28th November 2010, 10:08 PM	#3
dasfreak diyAudio Member Join Date: Aug 2010 Location: Sydney	Simple is my middle name! I'm actually using the passdiy PCB so nothing unusual there - not sure if you'd still like a photo. Pot is wired the same as B-1 assembly, Pass boards and PEC pots but on a dual gang. Not sure if it's the pot or not. It's the lack of voltage that's got me worried. Cheers, Graeme

30th November 2010, 01:56 AM	#5
budwiser diyAudio Member Join Date: Jan 2004 Location: Greenwood, IN	Should be ok with 24vdc. Build document says 18 to 24. Check to see if your R1 is still ok.

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