amp 1000W/2000W, IRFP240/9240

Federmann · 16th June 2010, 04:23 PM

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

nigelwright7557 · 16th June 2010, 08:54 PM

Any chance of a schematic ?

Federmann · 17th June 2010, 04:27 AM

Quote:

Originally Posted by nigelwright7557

Any chance of a schematic ?

Here Schema

sakis · 17th June 2010, 07:43 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, 09:43 AM

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

Aldotin · 17th June 2010, 10:16 AM

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

homemodder · 17th June 2010, 12:02 PM

Quote:

Originally Posted by Aldotin

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

Not even 2 pairs should be driven directly from the vas

Federmann · 17th June 2010, 03:25 PM

Quote:

Originally Posted by homemodder

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, 03:30 PM

Quote:

Originally Posted by homemodder

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, 03:37 PM

Quote:

Originally Posted by Xoc1

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

8 pairs and 2x500W

16th June 2010, 04:23 PM	#1
Federmann diyAudio Member Join Date: Oct 2009 Location: Kunovice - Moravia	amp 1000W/2000W, IRFP240/9240 My last 1000W (2000W) amp, PCB 40x270mm, 10 x IRFP240/9240 (2 x PCB 40x270mm, 20 x IRFP240/9240 )

16th June 2010, 08:54 PM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	Any chance of a schematic ? __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

17th June 2010, 07:43 AM	#4
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	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 ... __________________ SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

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17th June 2010, 09:43 AM	#5
Xoc1 diyAudio Member Join Date: Nov 2008 Location: Devon UK	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

17th June 2010, 10:16 AM	#6
Aldotin diyAudio Member Join Date: Dec 2009	10 pair of IRFP mosfets driven by the VAS directly?!

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