Am 24.06.2016 um 10:30 schrieb DK7FC:
Ignition coils, well, they may handle the voltage but i think the
winding will become to warm at 30 mA 24/7. But the main problem would
be that i need a certain inductance because it is a resonated circuit.
So i need an adjustable air gap into the ferrite material, like i have
in my arrangement. Also, the ignition coil may generate (and temporary
hold) 20 kV but i don't assume that it can generate that voltage at
2.97 kHz but just on higher frequencies. It is the same with the old
TV transformers (LOPT). They may generate 3 kV but not at 2.97 kHz.
There, they would saturate. Of course i already checked that a long
time ago :-)
Hi Stefan,
just another idea: what about old voltage transformers
(Spannungswandler) from your local utility company, at least for a test?
The 20-kV-versions should have an insulation test voltage of 50 kV
against ground and secondary winding, the nominal secondary voltage is
100 V at 50 Hz. They have high-quality iron cores and should core-wise
be able to handle more than 1 kW at 3 kHz. Following your own
transductor idea, you could superimpose a DC component in series to the
AC signal on the secondary (now primary) winding to tune the
inductivity. Weak points could be the current capability especially of
the primary (now secondary) windig and its resonance frequency - this
has just to be tested.
73 es gl,
Tom, DK1IS
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