On Mon, 31 Mar 2008 14:11:22 -0700, Esther & Fester Bestertester wrote:

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

Hi,

You need it to handle 1A of current down there? You must be a VLFer.

No cores is right, it will probably saturate and make for a BBQ. We are
talking a BIG air core inductor here. A variometer might be your best bet
for variable inductance with those specs. Give that a Google.

Cheers,
__
Gregg

A variometer might be your best bet
for variable inductance with those specs. Give that a Google.

Thanks for the pointer, Gregg. Excellent information available, once one
knows the right terminology. :-)

FBt

You need it to handle 1A of current down there? You must be a VLFer.

No cores is right, it will probably saturate and make for a BBQ. We are
talking a BIG air core inductor here.

OK, how about if I lower the specs to ~0.5A, or even less. How can I
construct a variable inductor 0 to 10 mHy (or more)?

Thank,
FBt

On Wed, 2 Apr 2008 23:00:33 -0700, Anon bozo wrote:
You need it to handle 1A of current down there? You must be a VLFer.

No cores is right, it will probably saturate and make for a BBQ. We are
talking a BIG air core inductor here.

OK, how about if I lower the specs to ~0.5A, or even less. How can I
construct a variable inductor 0 to 10 mHy (or more)?

Maybe a variac? Or, would that be too VVLF? HI!HI!

Jonesy
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Marvin L Jones | jonz | W3DHJ | linux
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