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Old 25th February 2005, 01:50 PM   #1
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Default Carlos' snubberized Gainclone Power supply, Part II

As we all know BrianGT is now marketing Carlos snubberized Gainclone PSU
http://www.chipamp.com/images/ps-rev3-sch.gif

I started the snubberization thread here . The question them is the same as now, almost anyway. I thought it was a bit peculiar to have 100 nF in parallel with 100 nF + 1 ohms. We have seen from real measurements and simulations that this unsnubbed 100 nF isn't doing any good (my words). This single 100 nF creates a peak, not big but still a peak... so what does the gathered expertise say about my "enhanced power supply"?

What does Carlos and Joseph_K say about this, I mean in theory.
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Old 25th February 2005, 05:24 PM   #2
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P-A, my psu is made like that, except that my snubb resistors are 2ohm. I did it like that because I wanted to keep the capacitors kind of separated for each chanel.
I dunno if it sounds better or not. OK, to me it does not sound worse in any way than the basic Carlos configuration, I could well be wrong though.

I am keen on seeing some theory on how the two configs differ from eachother
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Old 26th February 2005, 07:25 AM   #3
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Postpunk


Are you using the same 100nf cap?
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Old 26th February 2005, 10:43 AM   #4
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jaudio:
Nope. I am using only the snubbers, the 100nf bypass caps did nothing to the sound ( but they did something negative to the looks of the psu) with the 4 BC components 3300uf filter caps I am using per channel right now.

I like big differences, I tend to get frustrated with myself if I try to hear less than obvious differences.

Or did you mean if I use the same type of 100nf caps? I use mkt.
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Old 26th February 2005, 06:32 PM   #5
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Sorry I wasnt clear

I was wondering about the snubber cap. If you use a 2ohm resistor did you change the value of the cap(the one that is in series with the 2ohm resistor)?
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Old 26th February 2005, 06:40 PM   #6
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No, I didn´t.
If I would stay true to Carlos values I guess that I would have to use 50nf. I should perhaps try it.

Edit: I also need to be clear. I did what I did because I wanted to use a single bridge (consisting of 8 diodes) but have sort of separate filter capacitors for each channel, so I felt that I would need separate snubbers for each channel, even though they are not isolated from each other. I just ran double wires after the bridge ( taking guesses at how electricity flows and so on).

Perhaps this is madness, thats why I am keen of hearing some theory from those who have the knowledge.
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Old 26th February 2005, 10:05 PM   #7
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It´s awfully quiet in this thread. I sense owls in the moss..
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Old 28th February 2005, 08:31 AM   #8
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Default Re: Carlos' snubberized Gainclone Power supply, Part II

Quote:
Originally posted by peranders
What does Carlos and Joseph_K say about this, I mean in theory.
Please note that my parts in the schematics is nothing to care about, just the basic circuit.
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Old 28th February 2005, 09:32 AM   #9
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Quote:
Originally posted by postpunk
jaudio:
4 BC components 3300uf filter caps I am using per channel
That's a coincedence, 2x3,300uF BC components per rail (4 per channel) is exactly what I use! And it sounds really nice. I have parts to try this 'snubber', but for some days I've been trying to learn the sound of the amp as is.

I started with just 1x3,300uF per rail, and going to 2x3,300uF has led to a more relaxed, natural sound with easier detail, better low bass, and more realistic dynamics. More musical. The downside (apart from cost) is a reduction in the freshness and vitality of sound. I wonder if the 'snubber' somehow affects this quality. Bypass at the chip has always been 100uF Rubycon ZA. I will share my listening impressions after trying the snubber, and maybe some other ideas.
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Old 28th February 2005, 09:37 AM   #10
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peranders,

You are clearly committed to improving your understanding of the power supply in an amplifier, and how to improve it. You have mentioned very little of your own listening impressions. Do you tend to hear differences when you change the filter capacitence, any bypass caps, bridges, transformers etc.?

If you do not, then perhaps you will never hear the difference adding this resistor and capacitor might make.
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