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Old 13th November 2004, 06:17 PM   #1
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Talking Carlosfm's Regulated PSU for GC

To anyone who has a GC.. you gotta do a regulated power supply.. it's just literally breathtaking the results. The detail is so much better and the amp is much more transparent.. the bass is tighter too!!! And this is all with CHEAP No name caps on the lm3886. I haven't even gotten around to buying blackgates or equivalent! Don't forget to add the 0.1 uf caps between the transformer and the diodes, it makes a BIG difference. Thanks again Carlosfm for sharing your findings with the regulated PSU!

Take care,
300_baud
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Old 14th November 2004, 03:13 PM   #2
Cortez is offline Cortez  Hungary
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Default Thanks for posting, i'am glad about your experience ! :D

Quote:
Originally posted by 300_baud
Don't forget to add the 0.1 uf caps between the transformer and the diodes, it makes a BIG difference.
Exactly where should be placed this 0.1uF cap ?
Paralell to all of the power-diodes in the graetz ?
And where are the schematics of this regulated-PSU ?
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Old 16th November 2004, 10:21 PM   #3
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Look at the following attachment, you'll see what i'm talking about.
Attached Images
File Type: gif reg.gif (13.0 KB, 1156 views)
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Old 17th November 2004, 06:27 AM   #4
Will is offline Will  Malaysia
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Just a slight off topic,

how come nobody has ever applied these sort of
regulation for the tube buffer GC ?

Is it worthwhile doing so ?

regards,
Will.
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Old 17th November 2004, 11:30 AM   #5
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Default Re: Carlosfm's Regulated PSU for GC

Quote:
Originally posted by 300_baud
To anyone who has a GC.. you gotta do a regulated power supply.. it's just literally breathtaking the results. The detail is so much better and the amp is much more transparent.. the bass is tighter too!!!
I sign below.
Glad you like it.
BTW, original idea to use LM338s with the GC is from Pedja.

Quote:
Originally posted by Will
Just a slight off topic,
how come nobody has ever applied these sort of
regulation for the tube buffer GC ?
Fraz uses this PSU with his valve buffer IGCs.
Check the chipamp forum.
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Old 17th November 2004, 04:40 PM   #6
Cortez is offline Cortez  Hungary
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Default Re: Carlosfm's Regulated PSU for GC

Quote:
Originally posted by 300_baud
Don't forget to add the 0.1 uf caps between the transformer
and the diodes, it makes a BIG difference.
And did you try the regulator with and without these 0.1uF caps ?
What was that BIG difference ?
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Old 17th November 2004, 06:51 PM   #7
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Yeah i tried it at first without the 0.1 uf caps. When i did add the caps, the amp became much more transparent. High frequencies were much more apparent.

Try it out and report your findings here.
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Old 17th November 2004, 06:55 PM   #8
Cortez is offline Cortez  Hungary
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At the moment my gainclone doesnt have regulated PS,
but i will try this cap here too and reporting the results !
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Old 17th November 2004, 07:00 PM   #9
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This PSU is full of tricks.
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Old 17th November 2004, 07:16 PM   #10
Franz G is offline Franz G  Switzerland
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Yes, I use a regulated psu for the powerstage in my valve buffered amp.

Question: Why? There are already 7 regulators inside the LM chips?

Answer: What can this 7 regulators do, when the psu is sagging?

Answer 2: Nothing!

Solution: you could use a very big mains tranny (>300VA), or an >160VA tranny and a regulated supply.

Results must be nearby, imho.

National mentions several times in datasheets and application notes "a good psu".

Of course, this is the key. They use laboratory equipment for the measurement, regulated, for sure!

Franz
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