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Old 28th November 2010, 07:46 PM   #601
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Quote:
Originally Posted by stewin View Post
so for a powersupply of +/- 85vlts it is safe to use the irfp360 instead of irfp260 with this circuit
For +/- 85V IRFB4229 should much better.
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Old 28th November 2010, 08:38 PM   #602
stewin is offline stewin  Kenya
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i've heard of irfb but not available where i am thats why i am asking of irfp260or360,460
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Old 28th November 2010, 09:23 PM   #603
Pafi is offline Pafi  Hungary
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Quote:
Originally Posted by stewin View Post
so for a powersupply of +/- 85vlts it is safe to use the irfp360 instead of irfp260 with this circuit
Not really. I'm writing it for the 100th time like many other members: an old, high voltage MOSFET has slow body diode which makes it a bad solution in such a simple output stage. IRF360 has a Qrr of 5.6 uQ, and high channel resistance, so it's a really bad MOSFET for this circuit!

I said you should choose the LOWEST voltage rated device which meets the requirement!
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Old 29th November 2010, 05:16 AM   #604
luka is offline luka  Slovenia
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Qrr should really be 1/10 that
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Old 29th November 2010, 06:00 AM   #605
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I can't find that core (mictometal iron powder 130-2) in my contry .

Can I somehow use different core, or PC core with different wire and windings, enything else.

Thanks
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Old 29th November 2010, 06:02 AM   #606
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Ofcourse 20uH with 1uF filter, for big power amp

thanks, Nikola
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Old 29th November 2010, 09:12 AM   #607
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Hi Dzony988,you can use pc core with gap (i use a stone cutter with 11krpm to make 1mm gap)
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Old 29th November 2010, 04:42 PM   #608
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I get it, something like that?

How many turns and thick wire for 20uH with gap of 1mm on this core.

Thanks buddy
Regards, Nikola
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File Type: png core.png (11.1 KB, 1143 views)
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Old 29th November 2010, 07:04 PM   #609
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yes!! that is super ok ,for 17uH 23 turns 1.2/1.5mm wire made off 12....15x0.1mm wire(home made litz)
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Old 29th November 2010, 07:31 PM   #610
stewin is offline stewin  Kenya
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Quote:
Originally Posted by ionutzxpo View Post
Hi Dzony988,you can use pc core with gap (i use a stone cutter with 11krpm to make 1mm gap)
can that core survive if the amp supply is +/- 75vlts thanks
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