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Old 7th June 2011, 08:17 PM   #771
CeeVee is offline CeeVee  Portugal
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Man oh man this is getting really high level.

We are really getting some fantastic builds.
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Old 7th June 2011, 08:40 PM   #772
Itsmee is offline Itsmee  England
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Quote:
Originally Posted by jorgovanko View Post
They are not purchased, my friend made them.
Looks like I'm going to have to wind my own.

Quote:
Originally Posted by oj61 View Post
XA 50:4 It works since Dec. 2010.
  • Transformer 1500W (seondary: 1x44VAC)
  • 48VDC CLC => 8x10mF ->L L->8x10mF
  • Stereo =>32x IRFP250N
  • Total idle current: 7Amp DC
  • Temp at the top: 55C
  • Cooling: Alu plate 2.5mm Complete: 1 square meter
  • Top and down plate: 12mm
Your power amp is a work of art
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Old 7th June 2011, 09:01 PM   #773
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by Bksabath View Post
....
About the coils what is the cooper lenght please?
Inductor Designer / Calculator

don't go above 0R22
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Old 7th June 2011, 09:33 PM   #774
CeeVee is offline CeeVee  Portugal
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Here you go...all done !

It seems that in this case we have 0R37 !
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Old 7th June 2011, 09:33 PM   #775
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Tanks Zen
146 Feet but got loads of trubles converting that to meters
evvery time I got past a certain point I have to turn a corner and loose count.

And I am only size 7

Joke
right 50 meters shuld do nicely but calculator came up with 0.36 R
Had 2 on the mule cooper came by the kilo so I got 2 kilos and it was 2.5 mm square.
Not a blody clue of how meny henries and they look crap as right pain to bend and wind nicely.

PS tanks for calculator I sure it be handy.

PSS How do you mannage to find this stuff and remember where it is?
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Old 7th June 2011, 10:43 PM   #776
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by Bksabath View Post
......

PSS How do you mannage to find this stuff and remember where it is?


that's famous Mighty ZM's Futile Attempts Method

now you can go nutz ..... old recipe :

"some data for my chokes (presumably 9mH, certainly 0E2 Rdc) :

EI72 package
height of package ~30mm
entire window filled with 1,25 enameled wire

air gap ~ 0,5 mm "
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Old 7th June 2011, 11:40 PM   #777
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And Tanks CeeVee posting at the same time.

Looks like 50 meters is not that far off
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Old 8th June 2011, 05:12 PM   #778
oj61 is offline oj61  Germany
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Quote:
Originally Posted by Itsmee View Post
Looks like I'm going to have to wind my own.



Your power amp is a work of art
Yes , it was my intention. I would like to have no normal box.
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Old 8th June 2011, 06:32 PM   #779
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by Itsmee View Post
Looks like I'm going to have to wind my own.
Not Really....

Air core


By the way, the advantage of air core as opposed to ferrite core is that they have constant inductance irrespective of load.
Of course in a class A amp that argument is diluted because current is essentially
allways the same....well almost !
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Old 8th June 2011, 07:35 PM   #780
oj61 is offline oj61  Germany
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Default XA 50:4

Some more pictures
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File Type: jpg DSCF0001_.JPG (394.7 KB, 1747 views)
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