"F400" 400W PA with IRFP240/IRFP9240

Ermac · 23rd July 2009, 10:24 AM

Does anyone have a parts list for the attached schematic?

Here's its PCB:

Regards,
Ermac

P.s.
Can an output short circuit protection be added to this amplifier?

AndrewT · 23rd July 2009, 11:25 AM

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.

fjr · 23rd July 2009, 06:04 PM

It's the schematic of AV800 amplifier (designed by Anthony Holton).
Search for "AV800" on the forum!

Contruction notes, with schema and parts list:
Link

I'm not sure it' copyrighted or not

Ermac · 24th July 2009, 02:38 AM

Thank you!

Do you know the link to this similar amplifier?

ostripper · 24th July 2009, 03:56 AM

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.
OS

Ermac · 25th July 2009, 06:06 PM

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

23rd July 2009, 11:25 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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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23rd July 2009, 06:04 PM	#3
fjr diyAudio Member Join Date: Feb 2009	It's the schematic of AV800 amplifier (designed by Anthony Holton). Search for "AV800" on the forum! Contruction notes, with schema and parts list: Link I'm not sure it' copyrighted or not

24th July 2009, 03:56 AM	#5
ostripper diyAudio Member Join Date: May 2008 Location: Albany , NY (smallbany)	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. OS

25th July 2009, 06:06 PM	#6
Ermac diyAudio Member Join Date: Dec 2008	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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