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Old 25th May 2006, 05:03 PM   #1
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Default choke for output inductor

Which of these below would be best for output inductor for the D-Amp ?

http://www.elfa.se/elfa-bin/dyndok....dok=2011473.htm
http://www.elfa.se/elfa-bin/dyndok....dok=2011474.htm
http://www.elfa.se/elfa-bin/dyndok....dok=2011475.htm
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Old 25th May 2006, 05:54 PM   #2
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Stoc no. 2011474 - Cast filter chokes with iron powder cores freq up to 500 kHz. The one on 25 uH/2.5A might do the job .... but note 2.5A only .... not much!

Stoc no. 2011475 - INDUCTORS DESIGNED FOR NATIONAL’S 50 KHz SIMPLE SWITCHER™ ........ You would need one of the smalest values like the 47 uH/3A ..... but the intend to 50 kHz will not be enough for a good D-Amp, and will probably heat up.

Stoc no. 2011476 - No good as these are ment for 50 Hz/240 V filters


Better still would be to go for vinding one yourself. I have just ordered some T106-2 and T200-2 RF cores from Micrometals, which can be had for a few $ at:
Kits & Parts
You can download a design program from Micrometals
Calculating a filter can be done here

PS. Your links to the coils in this post does not work
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Old 25th May 2006, 06:04 PM   #3
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Maybe i can use the T106-1(or whatever they are) cores i already have, the ones from the puter ps output filters.

Maybe 15 turns would do.

Hum i tested the proggy, according to that i need 37 turns, if the cores i have are T106-2.
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