Funny you mention this, I have a classic coil (can shape, oil filled) that
I was thinking how to use in a coil. Interested in what others have done.
On Mon, Feb 13, 2023 at 3:37 AM Lux, Jim <jim@xxxxxxxxxxxxx> wrote:
> Has anyone tried using the secondary of an auto ignition coil as a
> charging inductor for a small coil?
>
> They are 10-30 H (depending on who measured it, etc.) They've got the
> HV insulation.
>
> I was wondering about the current handling. Typically, they seem to
> have a DC resistance of some 10 kOhm or more, and if you're driving
> from, say, a NST with an RMS output current of 30 mA, that works out to
> about 9-10 Watts dissipation (because I've not got a spice model of the
> actual charging current, etc.)
>
> Or, alternately, any source for 10 H inductors that can hold off 20kV?
> Short of winding my own. 200 or so turns on a 4 cm diameter core with
> mu=5000 would do it. Have to wind in 20 turn chunks to keep the voltage
> rating, reasonable, but that's doable.
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Joshua Thomas
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