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Old 29th November 2010, 08:51 PM   #611
qsa is offline qsa  Germany
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Hello,

Did somebody test this amplifier with +/- 85 V DC
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Old 29th November 2010, 08:56 PM   #612
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Quote:
Originally Posted by stewin View Post
i've heard of irfb but not available where i am thats why i am asking of irfp260or360,460
You can pick up irfb4227 at Farnell United Kingdom | world-leading distributor of electronic and maintenance, repair and operations products.
Or RS Components | Electronic and Electrical Components

I use irfb4019 as these are low gate capacitance yet will still drive 17 amps.
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Old 29th November 2010, 09:21 PM   #613
stewin is offline stewin  Kenya
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do they deliver if you are in another continent i.e africa, n what about their prices irfp 260 goes for about 1pound here how about the irfb prices are they competitive like the chinese.
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Old 29th November 2010, 09:32 PM   #614
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do they deliver if you are in another continent i.e africa, n what about their prices irfp 260 goes for about 1pound here how about the irfb prices are they competitive like the chinese.
They are both international companies.

IRFB4019 is just over a pound each.

RS has no minimum order charge.
Farnell min. order is £20.
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Old 29th November 2010, 09:39 PM   #615
stewin is offline stewin  Kenya
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thanks nigel i'll try to order even etd 54,49 cores and igbts thanks for shading light stewin
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Old 30th November 2010, 02:31 AM   #616
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On this link you have interesting information about toroid cores

Regards

Ferrite & Iron Powder Toroid Info
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Old 30th November 2010, 05:43 AM   #617
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Core form PC and from my picture (2.7 x 1.4 x 1.1cm) is actually IRON POWDER CORE 106-26 yellow-white (Al= 900uH/100turns)

Now I do not understand this calculation for 20uH coil and this core

N=100(L/Al)^1/2

=100(20/900)^1/2

=100(0.02222)^1.2= 15 turns

Why 17uH on this core has 23 turns and gap of 1mm????

But I made 23 turns with gap core (in atached pictures), wire that i use is 2x0,8mm
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Old 30th November 2010, 11:01 AM   #618
Pafi is offline Pafi  Hungary
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Al is officially nH/turn^2.

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Why 17uH on this core has 23 turns and gap of 1mm????
Because gap makes Al lower.

BTW: at high supply voltage this still will be hot.

Last edited by Pafi; 30th November 2010 at 11:08 AM.
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Old 30th November 2010, 01:01 PM   #619
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I measured with an LC meter and 23 turns with 1mm wire gives 17uH the meter has 2% error
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Old 30th November 2010, 02:02 PM   #620
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Why did you make a gap in a powder toroid?
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