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andrewlebon 3rd May 2010 07:04 AM

ucd 25 watts to 1200 watts using 2 mosfets
3 Attachment(s)
hi diyers
greetings has anyone built this amplifier with success
feedback would be greatly appreciated

thanking you
Andrew lebon

ViennaTom 3rd May 2010 06:18 PM


IRFP460 is 500 V Mosfet from the 90ies. U cant use it for +/-300V bridge! (!?). Besides, body reverse recovery is 8uC! no good for a bridge at all..

luka 3rd May 2010 06:32 PM

maybe at very low freq. but I would also say no go, and for 1200w you really don't need +/-300v, not even close to that

ezavalla 4th May 2010 02:26 AM


Originally Posted by andrewlebon (
hi diyers
greetings has anyone built this amplifier with success
feedback would be greatly appreciated

thanking you
Andrew lebon

It should be nice if you refer to the original author.
Ampli HighEnd ClaseD UCD de 25W a 1250Wrms sólo con 2 mosfets N - Foros de Electrónica

tacatomon 4th May 2010 02:45 AM

The photo with the two socktes empty is mine... :eek:

Cacho 4th May 2010 03:17 AM

Credit for that design goes to Eduardo Tagle (ejtagle in, an argentinian engineer.

And yes, there are some units built by different people, you just have to follow the link Ezavalla posted and read it. And, as he says, it would have been nice you mentioned the original author and where did you got the schematic.

Edit: By the way, it's nice to see you two (EZ and Tacato) here.

aldemarar 4th May 2010 03:27 AM

pairs as an unmasked

qsa 4th May 2010 09:05 AM

Did this design really work and sounding great ?

is this class D ....? cant see output filter

it looks like analog

Any substitute for Transistor D1426

not available in market

Cacho 4th May 2010 02:00 PM

It IS a Class D. You see the schematics Andewlebon copied and it may have mistakes, I haven't checked it. The original one (with a good PCB included) is hosted in the link Ezavalla posted. Check it.

D1426? There's no D1426 in the original design. You are looking for a replacement of the replacement. And now I check a bit... It looks like many transistors have been replaced in the Andrewlebon drawing.

ejtagle 4th May 2010 04:03 PM

Well, seems the amp finally poured into this forum.. I was asking myself when that would happen :) .. As it was said before, the schematics posted as the first ones on this forum are not the originals designed by me. They are derived versions of them, but in a bad way :( , as they are using slow mosfets that have unnecessarily high Rdson, making the amp run much hotter than required. And also, the amp is using as its power supply a truly high voltage, that is unsafe and a real hazard for people.
Please, dont build it as it is. Just follow the original diagram and use the enclosed PCB , that was optimized for it, that is posted on Foros de Electrónica - Comunidad Internacional de Electrónicos
As a sidenote, the amp is of the self oscillating class D type, based on the UCD technology and the associated patent, so, the amp itself is just for personal use. No commercial use is allowed for it
Regards, Eduardo

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