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SMPS for class A amps?
SMPS for class A amps?
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Old 16th March 2007, 07:29 PM   #1
folkeb is offline folkeb  Norway
diyAudio Member
Join Date: Jan 2006
Location: Trondheim
Default SMPS for class A amps?

Is it possible to think of SMPS for class A amplification? I have previously built a DIY version of the mighty Pass Labs Aleph 1.2 with a conventional PSU. However, I am thinking of building a Aleph 30 or Aleph X to keep my self busy. As I use a SMPS for my DAC with success I was thinking that this may be a good match for the Aleph 30.

Thanks for any insight.

BTW: Is it possible to get SMPS to deliver 60v out (for my preamp)?

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Old 23rd March 2007, 08:52 AM   #2
ssmith is offline ssmith  Kenya
diyAudio Member
Join Date: Aug 2005
Location: Nairobi
It's been done in a commercial Class A / AB amp -- here

I have a pair, they have a little hum problem which can be worked around. The SMPS inside puts out 67v / 800VA Too hot for the climate I live in, and they consume alot of juice. I don't need 200wpc either, so I'm planning on gutting the amp and putting in a lower output and linear class A.

The company eventually discontinued them and changed back to linear.
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Old 24th March 2007, 12:53 PM   #3
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
keep in mind that your ClassA will require rail currents that vary from Ib +-Ib = 0 to 2*Ib.
Will the SMPS manage that?

If it were a push pull topology then max current can be many times Ib.
regards Andrew T.
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