"F400" 400W PA with IRFP240/IRFP9240 - diyAudio
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Old 23rd July 2009, 10:24 AM   #1
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Default "F400" 400W PA with IRFP240/IRFP9240

Does anyone have a parts list for the attached schematic?

Here's its PCB:
Click the image to open in full size.


Can an output short circuit protection be added to this amplifier?
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Old 23rd July 2009, 11:25 AM   #2
AndrewT is offline AndrewT  Scotland
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FETs need a Zener from Gate to Source to prevent excessive Vgs destroying the FET.

This Zener (Zd3 & Zd4) can be reduced in voltage using the graphs in the datasheet to achieve short circuit protection. Add a diode in series with each of Zd3 & 4.

In other words, do some reading and you will find that the protection you are asking for costs nothing. A version is already be there.
regards Andrew T.
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Old 23rd July 2009, 06:04 PM   #3
fjr is offline fjr
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It's the schematic of AV800 amplifier (designed by Anthony Holton).
Search for "AV800" on the forum!

Contruction notes, with schema and parts list:

I'm not sure it' copyrighted or not
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Old 24th July 2009, 02:38 AM   #4
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Thank you!

Do you know the link to this similar amplifier?
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Old 24th July 2009, 03:56 AM   #5
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Looking at the schema it is the HX350 by ampslab.com ...exactly to the component level.
In the "symasym-the next generation" thread I will post "my " version soon.
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Old 25th July 2009, 06:06 PM   #6
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So I'm going to build an AV800 in a week. But before beginning I need to make sure the parts list is OK and the amp can be used with +/-50V and a 2 ohms load.

Please someone check those and let me know.

Thanks in advance, Ermac
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