Carlosfm's Regulated PSU for GC

300_baud · 13th November 2004, 06:17 PM

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

Cortez · 14th November 2004, 03:13 PM

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 ?

300_baud · 16th November 2004, 10:21 PM

Look at the following attachment, you'll see what i'm talking about.

Will · 17th November 2004, 06:27 AM

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.

carlosfm · 17th November 2004, 11:30 AM

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.

Cortez · 17th November 2004, 04:40 PM

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 ?

300_baud · 17th November 2004, 06:51 PM

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.

Cortez · 17th November 2004, 06:55 PM

At the moment my gainclone doesnt have regulated PS,
but i will try this cap here too and reporting the results !

carlosfm · 17th November 2004, 07:00 PM

This PSU is full of tricks.

Franz G · 17th November 2004, 07:16 PM

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

13th November 2004, 06:17 PM	#1
300_baud diyAudio Member Join Date: May 2004 Location: Toronto, Canada	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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17th November 2004, 06:27 AM	#4
Will diyAudio Member Join Date: Sep 2001 Location: Kuala Lumpur	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.

17th November 2004, 06:51 PM	#7
300_baud diyAudio Member Join Date: May 2004 Location: Toronto, Canada	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.

17th November 2004, 06:55 PM	#8
Cortez diyAudio Member Join Date: Dec 2002 Location: Hungary	At the moment my gainclone doesnt have regulated PS, but i will try this cap here too and reporting the results !

17th November 2004, 07:00 PM	#9
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	This PSU is full of tricks.

17th November 2004, 07:16 PM	#10
Franz G diyAudio Member Join Date: Jun 2004 Location: Bern / Switzerland	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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