Aleph 30 Power Supply

commandercam · 2nd February 2010, 04:10 AM

So I've decided to take the plunge and build an amp. I've settled on an Aleph 30 and I'm now in the process of sourcing parts. I think the first part of the project that I'm going to do is the power supply. The A30 schematic shows a total of 12 electrolytic caps (8x20000uF and 4x22000uF) in the PS. So I checked on availability/price on Mouser and the total came out $275.

I've seen some people mention surplus as a good option, but haven't been able to locate anything. Anyone have any leads on where to go? Should I just shell out the $275? Or are there other power supply designs that I should consider? I've also examined the A3 schematic and the A3 PS is simpler (i.e. fewer caps) but it has 25V rails instead of 22V. (A related thread says that this voltage difference shouldn't be a problem.)

On another note, I've been looking at heatsinks. I was considering Conrad (MF30-2F-151.5) but with shipping the total came to $170. They look like great heatsinks and the built-in dual rails might simplify chassis construction. Is this overkill for the A30 or again are there other options I should consider? Thanks!
Cam

massimo · 2nd February 2010, 06:56 AM

Caps: buy 12 pcs Panasonic TSHA 22mF/35V from Digikey (p.n. P6671-ND) @ 6.54$ ea.
They are good enough for this application and don't cost a fortune.

Surplus caps might be aged and they do need reforming

Bill Fuss · 2nd February 2010, 10:47 AM

There's no such thing as too big of a heat sink. Check out heatsinks usa on this forum.

uvellani · 3rd February 2010, 01:10 AM

Caps - Mallory Capacitor 20000 MFD 40 VDC New CGS203U040L

Heatsink - http://heatsinkusa.com/storename/hea...-10502834.aspx

Bill Fuss · 3rd February 2010, 11:15 AM

That's one hell of a deal on the caps, I wonder if they would give you the date code on them.

2nd February 2010, 04:10 AM	#1
commandercam diyAudio Member Join Date: Aug 2009	Aleph 30 Power Supply So I've decided to take the plunge and build an amp. I've settled on an Aleph 30 and I'm now in the process of sourcing parts. I think the first part of the project that I'm going to do is the power supply. The A30 schematic shows a total of 12 electrolytic caps (8x20000uF and 4x22000uF) in the PS. So I checked on availability/price on Mouser and the total came out $275. I've seen some people mention surplus as a good option, but haven't been able to locate anything. Anyone have any leads on where to go? Should I just shell out the $275? Or are there other power supply designs that I should consider? I've also examined the A3 schematic and the A3 PS is simpler (i.e. fewer caps) but it has 25V rails instead of 22V. (A related thread says that this voltage difference shouldn't be a problem.) On another note, I've been looking at heatsinks. I was considering Conrad (MF30-2F-151.5) but with shipping the total came to $170. They look like great heatsinks and the built-in dual rails might simplify chassis construction. Is this overkill for the A30 or again are there other options I should consider? Thanks! Cam

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2nd February 2010, 06:56 AM	#2
massimo diyAudio Member Join Date: Dec 2002 Location: Milan, Italy	Caps: buy 12 pcs Panasonic TSHA 22mF/35V from Digikey (p.n. P6671-ND) @ 6.54$ ea. They are good enough for this application and don't cost a fortune. Surplus caps might be aged and they do need reforming

2nd February 2010, 10:47 AM	#3
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	There's no such thing as too big of a heat sink. Check out heatsinks usa on this forum.

3rd February 2010, 01:10 AM	#4
uvellani diyAudio Member Join Date: Oct 2004	Caps - Mallory Capacitor 20000 MFD 40 VDC New CGS203U040L Heatsink - http://heatsinkusa.com/storename/hea...-10502834.aspx

3rd February 2010, 11:15 AM	#5
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	That's one hell of a deal on the caps, I wonder if they would give you the date code on them.

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