I have a .33 mh choke I need a .1469 mh

tom1356 · 3rd May 2004, 02:53 AM

can I just unwind some wire? it's a 20 ga. Iron core.
thanks!

Bill Fitzpatrick · 3rd May 2004, 04:59 AM

If it's for an application where quality is important, I'd buy a .15mh air core. Otherwise, yes, you can unwind turns.

tom1356 · 3rd May 2004, 11:17 AM

Quote:

Originally posted by Bill Fitzpatrick
If it's for an application where quality is important, I'd buy a .15mh air core. Otherwise, yes, you can unwind turns.

It is temporary for an experiment. Can I just unwind about half? should I count the turns and figure the impedence per turn?
I gotta get an inductance meter.
Thanks

Fuling · 3rd May 2004, 11:23 AM

If you remove half of the turns you will only get 1/4 of the inductance. Try reming about 30% instead.

tom1356 · 3rd May 2004, 11:53 AM

Quote:

Originally posted by Fuling
If you remove half of the turns you will only get 1/4 of the inductance. Try reming about 30% instead.

Great! Thanks.

Circlotron · 3rd May 2004, 12:13 PM

I'm with Fuling. The required number of turns remaining will be SQRT(0.1469/0.33) = 0.667 x the original amount of turns.

3rd May 2004, 02:53 AM	#1
tom1356 diyAudio Member Join Date: Mar 2002 Location: boston	I have a .33 mh choke I need a .1469 mh can I just unwind some wire? it's a 20 ga. Iron core. thanks! __________________ My "cult-like" following is accepting applications.

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3rd May 2004, 04:59 AM	#2
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	If it's for an application where quality is important, I'd buy a .15mh air core. Otherwise, yes, you can unwind turns.

3rd May 2004, 11:23 AM	#4
Fuling diyAudio Member Join Date: Aug 2001 Location: Sweden (Mora)	If you remove half of the turns you will only get 1/4 of the inductance. Try reming about 30% instead.

3rd May 2004, 12:13 PM	#6
Circlotron diyAudio Member Join Date: Jun 2002 Location: Melbourne, Australia	I'm with Fuling. The required number of turns remaining will be SQRT(0.1469/0.33) = 0.667 x the original amount of turns.

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