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Old 29th August 2012, 07:31 PM   #11
stewin is offline stewin  Kenya
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the voltage i have tried with no issues is +/-56vlts but i am on my way to drive it with +/-80vlts .

irf640 are nice but in my experience they fail when pushed hard at lower impedance e.g 4ohms ,8ohms . but i think i have a lot of desgin to do in order to make this amp work the way i want.
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Old 30th August 2012, 02:24 AM   #12
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Quote:
Originally Posted by stewin View Post
the voltage i have tried with no issues is +/-56vlts but i am on my way to drive it with +/-80vlts .

irf640 are nice but in my experience they fail when pushed hard at lower impedance e.g 4ohms ,8ohms . but i think i have a lot of desgin to do in order to make this amp work the way i want.
Yes they get hot when driven on 4ohm load....which fets do you think I should use....fast and working gr8 with lower impedance???
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Old 30th August 2012, 06:20 AM   #13
stewin is offline stewin  Kenya
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try irfb series. class d from ru has used irfb23n15 at+/-60vlts in discreet class d with success
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Old 30th August 2012, 07:51 AM   #14
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Quote:
Originally Posted by stewin View Post
try irfb series. class d from ru has used irfb23n15 at+/-60vlts in discreet class d with success
Ok....can any series with xxnxx will do the job or I have to use irfb series only???
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Old 1st September 2012, 07:10 PM   #15
stewin is offline stewin  Kenya
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irf540n or irfp250n are good with low voltage
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Old 3rd September 2012, 11:38 AM   #16
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I got my irs2092 board from sure electronics....its sounds gr8.....and i'm suprised by its response....i have tested it on 50 volts 8ohms load....output was heavy....no heating at all...the output fets were not tightened and till they were just a little warm after playing at full load for half an hour
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Old 28th November 2012, 08:28 AM   #17
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Hi! I like to build it.

Can you give us details of the output rf coil??

thks!!
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Old 28th November 2012, 03:29 PM   #18
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Quote:
Originally Posted by rodowitte View Post
Hi! I like to build it.

Can you give us details of the output rf coil??

thks!!
i used106-2 iron powder material with 22uh rating,,.....have u tried class d before?????????/
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