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GeDeon 19th April 2004 09:57 PM

PSU for Aleph, Aleph-X etc.
Kind time of day!
I am sorry for English - made the translator.
At me such question - why all power units, whether it be Aleph or Aleph-X, are made only with use of the big capacities for reduction of pulsations of a voltage, you see there are the circuits containing transistors which allow to reduce at smaller capacity pulsations better, than application of the big condensers is simple?:confused:

joensd 19th April 2004 10:21 PM

ThereŽs no reason to not use a capacitance multiplier to either improve PSU ripple or get by with less capacitance.
Just remember youŽll burn a few volts extra and so need bigger heatsinks (and transformer).
This kind of regulator is also described in a Passlabs article :
Have a look at the Zen Variations Part 3 here.

SI 20th April 2004 08:13 AM

With more capacitence one doesn't have to worry about running out of Voltage or current at the rails when the load impedance lowers with the signal. I think:confused:


Duck-Twacy 20th April 2004 05:47 PM

I think Gedeon means why not use a switching power supplies (like in a Chord)?

JDeV 20th April 2004 09:20 PM

Why not indeed?
A and T Labs make a 700W MOSFET amp with SMPS.
See link for circuits.

GeDeon 21st April 2004 06:44 AM

Greetings to all!
Thank for answers!
When I wrote the first post I had in view of something similar to a volume that has given in the reference joensd.
But I did not think about SMPS. Under your reference, JDeV, just 1kW power supply :) It`s good idea!

Golgoth 31st May 2004 07:42 AM

A and T Labs 1kW SMPS
Hi all!

Has anybody actually built the A and T Labs 1kW SMPS design, either DIY or from the parts their supply?

I Googled for "A and T Labs" and all I found basically, apart from their site and a few casual mentions, was business directory listings. I couldn't find any mention on the web of somebody having built their amps or SMPS designs.

Positive or negative experiences welcome!


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