Hi-Cap PS By Carlos FM

[neeraj]

Hi,
Its my try to make a DIY PCB. Schematic belongs to Carlos FM.

Its single sided PCB. need suggestion for improvements if required.

Thanks.

[AndrewT]

I saw this in some other thread. Are you double posting?

There too, there was no link to Carlos' schematic.
And no schematic nor trace layout for this proposal.

How can you expect any sensible comment?

[neeraj]

Originally Posted by AndrewT

I saw this in some other thread. Are you double posting?

There too, there was no link to Carlos' schematic.
And no schematic nor trace layout for this proposal.

How can you expect any sensible comment?

Hi AndrewT,
This is made by me only. I am not posting it twice in this forum.
And sorry for not attaching the original schematic.
Here it is.
Made on Express PCB
waiting for comments

[abraxalito]

Originally Posted by neeraj

waiting for comments

More of a question really - I can't really see what the point of the 1.5nF and 0R47 snubber networks is. The fact that the 0.47ohm resistors are 1W rated seems to suggest there's going to be a fair amount of RF to soak up yet the 1.5nF is spec'd as an MKT. As far as I'm aware these have significant series inductance which will successfully block any RF from reaching the resistor.

If you're serious about soaking up RF above 50MHz on the supply, you'd need to use, say, a bunch of WIMA FKP02 100pF polypropylenes in parallel - this particular value has an SRF close to 200MHz. Or alternatively use SMT C0Gs.

Oh, and I'd split the 1R 10W resistor into two 0.47s and use the first where the 1R is now and the second between the two 10,000uFs. I think two RC filtration stages in series will be quite a bit better than one.

[neeraj]

Hi abraxalito,
If i have understood it correctly i have to use 2 x 0.47/1watt accros the each 10000 caps instead of single 1e/10w used before two caps.
As i have mentioned earlier that the schematic is solely done by Carlos FM & the result is posted on Nukk and vikash chauhan's website.
Hence i have just prepared a simple DIY single sided board to use it with my chipamp based on schemetic by carlos.. I just want to know that is the layout is correct or not.

Thanks

[abraxalito]

Originally Posted by neeraj

Hi abraxalito,

Hiya

If i have understood it correctly i have to use 2 x 0.47/1watt accros the each 10000 caps instead of single 1e/10w used before two caps.

No, you didn't understand me correctly, but as you don't want comments on the schematic but only on the layout, I'll shut up now For me though, its important to get the schematic optimised before considering the layout.

[janneman]

Originally Posted by neeraj

Hi abraxalito,
If i have understood it correctly i have to use 2 x 0.47/1watt accros the each 10000 caps instead of single 1e/10w used before two caps.
As i have mentioned earlier that the schematic is solely done by Carlos FM & the result is posted on Nukk and vikash chauhan's website.
Hence i have just prepared a simple DIY single sided board to use it with my chipamp based on schemetic by carlos.. I just want to know that is the layout is correct or not.

Thanks

I think what abrax is telling you is that the circuit can be made to perform much better by just a few simple changes (and I agree). It's clear from the circuit what whoever drew it wanted to do but he/she didn't get it quite right.

So it's your choice whether you want to discuss that, and learn something in the process or stay with how it is.

jd

[neeraj]

Originally Posted by abraxalito

Hiya



No, you didn't understand me correctly, but as you don't want comments on the schematic but only on the layout, I'll shut up now For me though, its important to get the schematic optimised before considering the layout.

Hi abraxalito
Please don't take me wrong. i've never think about it.
Your valuable suggestion are welcome & the purpose of posting the layout in this forum is to get suggestion & guidance from persons who have deep knowledge about the same. kindly suggest the required improvements.

[abraxalito]

Originally Posted by neeraj

Hi abraxalito
Please don't take me wrong. i've never think about it.

Jan's quite right - not everyone wants to learn, some prefer just to copy a schematic they find from somebody else. Its not a bad thing if all you want to do is copy - but then I won't waste time trying to educate you

Your valuable suggestion are welcome & the purpose of posting the layout in this forum is to get suggestion & guidance from persons who have deep knowledge about the same. kindly suggest the required improvements.

As I mentioned earlier, it would be better to have two stages of RC filtering than merely one. At present your Rs are the 1R/10W resistors prior to the first 10,000uF caps. I'm suggesting that you split the 1R notionally into two half-ohm resistors (5W each) and put the first one in place of the 1R you have now. The second one goes in the +ve line between C3 and C5. Ditto for the negative side.

Also the snubber part of the circuit doesn't look so well thought out (though I will point out here I have little experience with snubbers). It looks to be to absorb high RF frequencies (I deduce this from the lowish capacitor value, 1.5nF), but won't be likely to do that unless the right capacitor is specified and its layed out correctly. I will have a look at your layout later and make some suggestions.

[preiter]

It might be useful to reference the original thread on this design...

The (high-cap.) unregulated PSU for chipamps