The (high-cap.) unregulated PSU for chipamps

[carlosfm]

Originally posted by Upupa Epops
To Carlos : All what you now discover, you may to see on my 4780 PCB .

I was about to test this for some time.
I know your schematic and I didn't see a snubber on the caps.
Also, your pdf schematic file has many question marks (?), it doesn't show the values of many components.

[Upupa Epops]

To Carlos : Look at www. czechaudio.com. There is all. For what snubber ?

[carlosfm]

Originally posted by Upupa Epops
To Carlos : All what you now discover, you may to see on my 4780 PCB .

Originally posted by Upupa Epops
For what snubber ?

Now I'm confused.
What do you mean?
Can you elaborate?

Originally posted by Upupa Epops
To Carlos : Look at www.czechaudio.com. There is all.

You only have a PA03 amp in the Projects seccion.

[roibm]

Would be nice if someone would use black gate for the snubber? Bad or good?
Carlos, do you have any?

[carlosfm]

Originally posted by roibm
Would be nice if someone would use black gate for the snubber? Bad or good?
Carlos, do you have any?

100~120nf?
Does it exist?
Polyester or polyprop is fine...

[roibm]

Originally posted by carlosfm
100~120nf?
Does it exist?
Polyester or polyprop is fine...

Well, Black Gate NX Hi-Q 0.1uF/50V would be the one to use in this case. I doubt it would do much good if at all, but still would be interesting to try.

[Upupa Epops]

To Carlos : Do you mean this RC element on your schematic? Do shorter traces on PS and you don't need it. By the way, wattage of this resistor is enough 0.25 W, not 3 W.

[jkeny]

Matjans,
I know this is off topic but I am thinking of buying a 2 x UCD180 class D modules. How does it compare sonically to the gainclone? I have asked this question on class D forum but no direct comparisons given. I have built gainclone and know the sound and wondered how much better UCD180 modules were?

John

[roibm]

Originally posted by jkeny
I have built gainclone and know the sound and wondered how much better UCD180 modules were?

Is it a given that UCD180 is better?

[carlosfm]

Originally posted by Upupa Epops
To Carlos : Do you mean this RC element on your schematic? Do shorter traces on PS and you don't need it.

Nah, I tested bigger caps on the chip's pins and with higher than 1,500uf per rail/chip it starts sounding worse and worse.
Upupa, read my posts and those articles, as I think it should be quite clear that it's not a question of cabling or PCB traces.