amp 1000W/2000W, IRFP240/9240
 

http://www.federmann.cz/images/stori...505W_10_1W.bmp

My last 1000W (2000W) amp, PCB 40x270mm, 10 x IRFP240/9240 (2 x PCB 40x270mm, 20 x IRFP240/9240 )

Any chance of a schematic ?

Here Schema

often pcb designers have a fiction or a vice with symmetrics and size ( including me ) ....playing this game might end up with an ultra compact and symmetric pcb but that comes with a a couple of troubles

one : that no one can use a bigger semi for the output if exist or if needed

two: keeping so many output semis so close to each other means that the heatsink has to be made of zorex, kryptonex, starson or any other material from the moon or jupiter to be able to absorve this type of heat ...

Federmann
Has anyone ever built this layout and effectively cooled it?
I am strugging to envisage an efficient heatsink layout to suit.:flame:
Maybe a re-design is required to the layout of the output mosfets to suit the real world.
For a working example, look at Quasi's designs which are documented on his website
Quasi's DIY Audio Site

10 pair of IRFP mosfets driven by the VAS directly?! :nownow:

Not even 2 pairs should be driven directly from the vas ;)

There is no reason to give more of the transistor.

It depends on how much current goes through the VAS.

I have succesfully used 3 pairs with just a VAS driver, the frequency response was fine over the audio range.

http://www.federmann.cz/images/stori...F/504/HQQF.jpg
http://www.federmann.cz/images/stori...55-503WK_1.JPG

8 pairs and 2x500W