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Old 2nd January 2011, 02:48 PM   #1
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Exclamation holton AV400 help..??

Hi guys,

i an currently building holton AV400 amp. with 2x50 v 1KVA transformer
my question is can i use IRF640/IRF9640 instead of IRFP240/IRFP9240 ..?
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Old 2nd January 2011, 03:51 PM   #2
khalsa is online now khalsa  India
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use IRFP240/IRFP9240 is ok minimam 4pair for good results
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Old 2nd January 2011, 04:06 PM   #3
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ok but what about using IRF640/IRF9640 instead of IRFP240/IRFP9240..??!!
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Old 2nd January 2011, 04:15 PM   #4
HighTec is offline HighTec  Croatia
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Yes, you can use them but they have a maximum power dissipation around 125w so you'll need to use at least 6-7 pairs per channel. Especially if you wanna drive loads under 8 ohms.

Last edited by HighTec; 2nd January 2011 at 04:19 PM.
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Old 2nd January 2011, 04:34 PM   #5
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I found irfp240/9240 to be more available.
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Old 2nd January 2011, 08:12 PM   #6
jaycee is offline jaycee  United Kingdom
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You're building a high power amp. Don't try to skimp on the cost, build it as the designer intended, unless you want it to blow up in your face.

Look at the difference between the two devices. IRFP240's are capable of 20A and dissipating 150W in their TO-247 casings. The IRF640 does 18A, but it is a TO-220 case that will only dissipate 125W. You will be reducing the dissipation of the amp to the point where it will blow up. If you use more devices, then you are making a harder load to drive, which will result in instability.

Last edited by jaycee; 2nd January 2011 at 08:17 PM.
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Old 2nd January 2011, 10:30 PM   #7
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<<unless you want it to blow up in your face.>> u r right jaycee,i think i missed this point ..
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Old 3rd January 2011, 01:06 AM   #8
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<<unless you want it to blow up in your face.>> u r right jaycee,i think i missed this point ..
Here is someone who DID build it and did not go "BANG" ... another one to build an AV800 / AV1000

It depends on the end use and how much money you want to spend. Vertical OPS = GOBS of power (PA use)... lateral OPS= nicer sound , less power - simpler biasing.

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Old 3rd January 2011, 08:53 AM   #9
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Hi

You can find IRFP240 and IRFP9240 at DigiKey or Mouser but they are expensive there.

Where are you from?

I could help you out. I bought 100 each for my project and could sell you 2x4 matched devices.

Regards,
Lee
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Old 3rd January 2011, 01:13 PM   #10
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Originally Posted by Lee Knatta View Post
Hi

You can find IRFP240 and IRFP9240 at DigiKey or Mouser but they are expensive there.

Where are you from?

I could help you out. I bought 100 each for my project and could sell you 2x4 matched devices.

Regards,
Lee
hii lee,
i am from egypt too far from u but any way thnx 4 trying 2 help me.
and what`s the best way to match these mosfets ??


regards,
shady
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