This is the answer:
http://www.qsl.net/in3otd/variodes.html


"Esther & Fester Bestertester" wrote in message
obal.net...
I'd like to build a variable inductor with what I have around my shop
(lots
of bits n' pieces, but no cores). I need it to work in the area of 20-30
mH,
1A, 25-30 KHz.

Is this something do-able? Is there something available off-the-shelf?

Suggestions of how to go about it would be greatly appreciated.

FBt

On Thu, 03 Apr 2008 15:57:08 GMT, JB wrote:
This is the answer:
http://www.qsl.net/in3otd/variodes.html

I like the way the answers are carried out to *thirteen* decimal places!

I never measured a Variac before. Might be higher than you were looking
for. That's variable for sure. A good thing to have around the shop.

"JB" wrote in message
news77Jj.18730$bC6.7879@trnddc08...
This is the answer:
http://www.qsl.net/in3otd/variodes.html


"Esther & Fester Bestertester" wrote in message
obal.net...
I'd like to build a variable inductor with what I have around my shop
(lots
of bits n' pieces, but no cores). I need it to work in the area of 20-30
mH,
1A, 25-30 KHz.

Is this something do-able? Is there something available off-the-shelf?

Suggestions of how to go about it would be greatly appreciated.

FBt