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Re: The Ultimate Adjustable Tesla Coil Capacitor: .001-1 mfd in .001 mfd increments!
Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>
At 04:19 PM 11/2/2006, you wrote:
Original poster: Ed Phillips <evp@xxxxxxxxxxx>
Original poster: "Jeff Behary" <jeff_behary@xxxxxxxxxxx>
I've developed a special adjustable capacitor for tuning Tesla Coils.
I've tested and used it for 2 years, and was going to patent the
idea but honestly can't afford to. So here it goes, an adjustable
capacitor rated from .001 mfd to 1 mfd in .001 mfd increments...it
can tune any Tesla Coil exactly and can be easily built by all by
off-the-shelf materials. Best of all there are no moving
parts...its all done mathematically - and using simple math no less!
Jeff Behary, c/o
The Turn Of The Century Electrotherapy Museum
The same general "binary" design, sometimes using special
switches and sometimes how, has been in use for a very long
time. I have a bunch of power factor correction capacitors fof WW2
airborne radios which operated from 400~ power. They go from 1 ufd
to 21 ufd in 1 ufd steps.
I just connect to them with toggle switches and find them very useful.
I'm pretty sure a lot of precision resistor boxes do the same thing,
adding in series rather than in parallel.
and, for, instance, most antenna auto tuners use relays to select Ls
and Cs in a binary sequence.
The challenge is in finding suitable relays and capacitors, depending
on your switching strategy. The big caps need to have higher current ratings.