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Old 9th September 2006, 01:20 PM   #11
kvholio is offline kvholio  Netherlands
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Quote:
However ALL the diagrams need further work on the grounding.
I agree. Strangely when you wire up the pcb's from chipamp.com the way you are "supposed to" you end up with a grounding-scheme exactly like in the posted schematics.

AndrewT is spot-on with his recommendations, i strongly suggest you follow them.

With kind regards,

Klaas
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Old 10th September 2006, 09:20 AM   #12
AndrewT is offline AndrewT  Scotland
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Hi Kv,
I have never built a chipamp or one of it's PCB mounted PSUs.
Have you tried to compare the hum/buzz performance of the chipamp PSU with a hardwired version matching the good audio grounding recommendations?
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Old 10th September 2006, 09:46 AM   #13
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Originally posted by triast
So which one is correct?
I drew the BrianGT's maps.... i've always had trouble with the orientation of diodes... the top one is correct (at least that is the one in my most current master file) -- the 2nd one should never have gotten on his website -- it was a beta that didn't pass QC.

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Old 10th September 2006, 10:04 AM   #14
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Quote:
Originally posted by kvholio
I agree. Strangely when you wire up the pcb's from chipamp.com the way you are "supposed to" you end up with a grounding-scheme exactly like in the posted schematics.
My BrianGT/Peter Daniel GC was dead quiet... grounds came together on the amp board and the filte caps are right next to the chip....

I don't know if he is the origin, but this was Thorsten's recommended scheme when he 1st introduced the start of the "official" GCs on the Full Range Forum.

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Old 10th September 2006, 10:14 AM   #15
kvholio is offline kvholio  Netherlands
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Hi Andrew, i didn't try the psu-pcb's.The high-capacity gc's i built always had ps-ground simply between the two big c's.
Keeping the gnd's separate at the psu, and joining them at the amp's pcb didn't make any sense to me, so i didn't try it.
I never experienced any hum-problems with my gc's .
It might be fun to try though and compare performance.Need some new rectifiers to do this.(don't ask how i blew up the old ones- i'm a klutz).
I will do the experiment and report back on this

This picture shows clearly that ps-gnd is not at the psu-pcb from chipamp.com:
http://www.briangt.com/gallery/snubber/ps_020

planet10, were you using these psu-pcb's with your gc's ?

With kind regards,

Klaas
(waiting on my ati-case for the ksa-clone )
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Old 10th September 2006, 10:28 AM   #16
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Quote:
Originally posted by kvholio
planet10, were you using these psu-pcb's with your gc's ?
Yes.
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Old 10th September 2006, 10:43 AM   #17
kvholio is offline kvholio  Netherlands
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Thanks for the info Planet10. btw, your hum-free result doesn't surprise me.
i just see no reason to keep those gnd's separate at the psu.
Guess i'll have to try and see how it works out.

With kind regards,

Klaas
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Old 10th September 2006, 11:07 AM   #18
AndrewT is offline AndrewT  Scotland
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Hi Kv,
Quote:
always had ps-ground simply between the two big c's.
Can I assume the important word is HAD and that you now HAVE the audio ground elsewhere?
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Old 10th September 2006, 11:40 AM   #19
kvholio is offline kvholio  Netherlands
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Quote:
Can I assume the important word is HAD and that you now HAVE the audio ground elsewhere?
nope.
I HAVE my ps-ground(should i say 0V common ?) between the big c's and i HAVE my audio-ground elsewhere.

With kind regards,

Klaas
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