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-   -   amp 1000W/2000W, IRFP240/9240 (http://www.diyaudio.com/forums/solid-state/168707-amp-1000w-2000w-irfp240-9240-a.html)

Federmann 16th June 2010 05:23 PM

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 )

nigelwright7557 16th June 2010 09:54 PM

Any chance of a schematic ?

Federmann 17th June 2010 05:27 AM

Quote:

Originally Posted by nigelwright7557 (Post 2218619)
Any chance of a schematic ?


Here Schema

east electronics 17th June 2010 08:43 AM

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 ...

Xoc1 17th June 2010 10:43 AM

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

Aldotin 17th June 2010 11:16 AM

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

homemodder 17th June 2010 01:02 PM

Quote:

Originally Posted by Aldotin (Post 2219150)
10 pair of IRFP mosfets driven by the VAS directly?! :nownow:

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

Federmann 17th June 2010 04:25 PM

Quote:

Originally Posted by homemodder (Post 2219227)
Not even 2 pairs should be driven directly from the vas ;)

There is no reason to give more of the transistor.

nigelwright7557 17th June 2010 04:30 PM

Quote:

Originally Posted by homemodder (Post 2219227)
Not even 2 pairs should be driven directly from the vas ;)

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.

Federmann 17th June 2010 04:37 PM

Quote:

Originally Posted by Xoc1 (Post 2219131)
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

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

8 pairs and 2x500W


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