pimp my PSU or not to pim my PSU?

f.pelosa · 9th April 2011, 04:05 PM

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:

option 2:

Thanks a lot for your help
Ale

Salas · 9th April 2011, 04:52 PM

We see no pictures. Please upload them as 1024X768 in this server.

f.pelosa · 9th April 2011, 06:55 PM

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

f.pelosa · 11th April 2011, 12:47 PM

Can you see the pictures now?
Any suggestion on which PSU to build?

Salas · 11th April 2011, 01:51 PM

Quote:

Originally Posted by f.pelosa

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.

Salas · 11th April 2011, 01:53 PM

Quote:

Originally Posted by f.pelosa

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.

f.pelosa · 11th April 2011, 04:35 PM

it's a Leach Amp.

Salas · 11th April 2011, 04:45 PM

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.

hm4nine · 11th April 2011, 07:01 PM

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.

9th April 2011, 04:05 PM	#1
f.pelosa diyAudio Member Join Date: Oct 2009	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: option 2: Thanks a lot for your help Ale

11th April 2011, 07:01 PM	#9
hm4nine diyAudio Member Join Date: Mar 2005 Location: Vienna	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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9th April 2011, 04:52 PM	#2
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	We see no pictures. Please upload them as 1024X768 in this server.

9th April 2011, 06:55 PM	#3
f.pelosa diyAudio Member Join Date: Oct 2009	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

11th April 2011, 12:47 PM	#4
f.pelosa diyAudio Member Join Date: Oct 2009	Can you see the pictures now? Any suggestion on which PSU to build?

11th April 2011, 04:35 PM	#7
f.pelosa diyAudio Member Join Date: Oct 2009	it's a Leach Amp.

11th April 2011, 04:45 PM	#8
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	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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