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Old 16th June 2010, 04:23 PM   #1
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Default amp 1000W/2000W, IRFP240/9240

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My last 1000W (2000W) amp, PCB 40x270mm, 10 x IRFP240/9240 (2 x PCB 40x270mm, 20 x IRFP240/9240 )
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Old 16th June 2010, 08:54 PM   #2
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Any chance of a schematic ?
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Old 17th June 2010, 04:27 AM   #3
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Originally Posted by nigelwright7557 View Post
Any chance of a schematic ?

Here Schema
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Old 17th June 2010, 07:43 AM   #4
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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 ...
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Old 17th June 2010, 09:43 AM   #5
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Federmann
Has anyone ever built this layout and effectively cooled it?
I am strugging to envisage an efficient heatsink layout to suit.
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
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Old 17th June 2010, 10:16 AM   #6
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10 pair of IRFP mosfets driven by the VAS directly?!
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Old 17th June 2010, 12:02 PM   #7
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10 pair of IRFP mosfets driven by the VAS directly?!
Not even 2 pairs should be driven directly from the vas
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Old 17th June 2010, 03:25 PM   #8
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Not even 2 pairs should be driven directly from the vas
There is no reason to give more of the transistor.
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Old 17th June 2010, 03:30 PM   #9
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Originally Posted by homemodder View Post
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.
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Old 17th June 2010, 03:37 PM   #10
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Quote:
Originally Posted by Xoc1 View Post
Federmann
Has anyone ever built this layout and effectively cooled it?
I am strugging to envisage an efficient heatsink layout to suit.
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
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8 pairs and 2x500W
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