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Old 18th July 2009, 04:59 PM   #1
sekhar is offline sekhar  India
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Default Using Power MOSfets Instead Of L Mosfet

I am new in this this field of audio amps . I have been consulting High Power Audio Amplifier Manual By G Randy Slone .
I want to make a 500W subwoofer amplifier but due unavailability of L Mosfet I am nt able to procced can any body tell how to use Power Mosfet(IRFP240/IRFP9140) instead of 2SK1058/2Sj162.
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Old 18th July 2009, 06:56 PM   #2
lineup is offline lineup  Sweden
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IRF mosfet are HEXFET
they are very different than 2SK1058/2SJ152 = lateral mos
So, strongly not recommended to use them to replace.
In fact, you would have to change the original amplifier so much
that it would be a different amplifier.

Much Better to try to find some nice MOSFET amp
that is built to use IRFP240/IRFP9240
For example Nelson Pass has designed a couple of such amplifier projects.

Regards
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Old 18th July 2009, 07:06 PM   #3
Spirtos is offline Spirtos  Greece
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There are great differences between vertical (IRFP) and lateral type of mosfets (2SK/J). Allthough both can be used in power amps better dont use vertical insted of lateral type in specific designs, specially R. Slone's designs need a lot of modifications to suit vertical type mosfets and after all it will not be the same amp. As Lineup said better find a design which uses vartical mosfet. Try some search and Im sure you ll find a lot. Nelson Pass' designs are a good start.

Regards
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Old 20th July 2009, 02:16 PM   #4
sekhar is offline sekhar  India
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thanks a lot, but can u direct me towards any specific design. I am thinking about making "Citation 12" from the Nelson pass Labs or the IGBT amp from elector. Plz tell which is worth trying cause i have tried a lot of circuits from the net but many have failed ...... instead of the fact that i design my own pcbs.

And one more thing....... Plz tell if any heip needed on Pcbs ...... just upload the circuit I will try to send u the pcb
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Old 20th July 2009, 03:27 PM   #5
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I would go with a modern IRFP design.
IRFP240 and IRFP9240 are cheap and plentiful.

I use them on my own designs and they perform very well.
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Old 20th July 2009, 03:39 PM   #6
AndrewT is offline AndrewT  Scotland
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Have a look at the various Quasi designs.
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Old 20th July 2009, 03:46 PM   #7
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Quote:
Originally posted by AndrewT
Have a look at the various Quasi designs.

RS Components do IRFP250 at 1-49.
Cheap as chips !
www.rswww.com
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Old 20th July 2009, 10:07 PM   #8
sekhar is offline sekhar  India
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Thanks for the advise "nigelwright" . Can u Send me Some of your design I am nt able to find good quasi complementary design.

regards
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Old 20th July 2009, 10:15 PM   #9
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Quote:
Originally posted by sekhar
Thanks for the advise "nigelwright" . Can u Send me Some of your design I am nt able to find good quasi complementary design.

regards

I dont have a quasi design mine are all complementary using IRFP250 and IRFP9240.

There are loads of designs on here if you do a search for quasi.
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Old 21st July 2009, 06:14 PM   #10
sekhar is offline sekhar  India
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thanks "nigelwright" u can send ur complementary designs as well. I wanted to make quasi complementary amps because i didnt get L mosfets in India .
Neways currently I am making the following 125W design. If u can have a look at circuit plz it would be very helpful

regards
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