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Old 9th April 2011, 04:05 PM   #1
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Default pimp my PSU or not to pim my PSU?

hello,
I'm planning to build a Leach Amp, and I'm now working on the PSU.
My question is whether it's worth to invest some bucks for a better engineered PSU.

Considering it's a class AB amp, would one of the two following option be more appropriate than the standard "transformer - rect. bridge - cap (1x 10000uF per channel)" approach?

The two other options I have in mind are these:

option 1:
Click the image to open in full size.

option 2:
Click the image to open in full size.

Thanks a lot for your help
Ale
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Old 9th April 2011, 04:52 PM   #2
Salas is offline Salas  Greece
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We see no pictures. Please upload them as 1024X768 in this server.
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Old 9th April 2011, 06:55 PM   #3
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Mh.. how can I show the pictures directly in my message?
Anyway, these are the direct links to the pictures.
option 1:
psu option 1
option2:
psu option 2

Thanks again
Ale
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Old 11th April 2011, 12:47 PM   #4
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Can you see the pictures now?
Any suggestion on which PSU to build?
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Old 11th April 2011, 01:51 PM   #5
Salas is offline Salas  Greece
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Quote:
Originally Posted by f.pelosa View Post
Mh.. how can I show the pictures directly in my message?
Anyway, these are the direct links to the pictures.
option 1:
psu option 1
option2:
psu option 2

Thanks again
Ale
When composing a post there is an attach files area with a 'manage attachments' thing when you scroll down.
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Old 11th April 2011, 01:53 PM   #6
Salas is offline Salas  Greece
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Quote:
Originally Posted by f.pelosa View Post
Can you see the pictures now?
Any suggestion on which PSU to build?
Yes now we can see those. To say something we should know more about the amp I guess. Wattage, bias. No2 looks more sophisticated anyway.
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Old 11th April 2011, 04:35 PM   #7
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it's a Leach Amp.
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Old 11th April 2011, 04:45 PM   #8
Salas is offline Salas  Greece
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That is a 120W per channel amp I think. The second PSU has better diodes and the small resistor plus parallel 4.7mF capacitors are nicer. I would avoid C9/C10.
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Old 11th April 2011, 07:01 PM   #9
hm4nine is offline hm4nine  Europe
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Default pimp my PSU or not to pim my PSU?

The second supply is the better one, but you should decrease the series resistors to 0R22 which will be much smaller than the typical power supply effective resistance. It can have a remarkable effect on reducing ripple and high frequency noise content. And use lots of capacitance after these resistors for reducing the corner frequency of the resulting low pass.
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