RE: [TCML] Tuning idea

["Rich Schmuke" <rdj@xxxxxxxxxxxx>]

Ben
I made my own variable capacitor for a 12KVdc RF amp tank. In the radio
world it is called a plate cap , the supply voltage can be 6Kvdc but you can
get 12Kv ringing in the circuit.
Take a look at it.
http://www.flickr.com/photos/kd0zz/
But it is not enough capacitance for my coil. Ii would have to be a "BIG"
one for a coil. I like the idea of making one but it would cost a bit.

Rich, from the middle of Missouri 


.

Regards, Gary Lau
MA, USA

> Hi all
>
> ive had an idea about tuning: instead of using a variable
> primary tap, and
> having to cut power change tap position and reapply power
> etc, etc, why not
> use a variable tank capacitance... a high voltage trimmer
> cap coulg be made
> out of any flat sheet material (hard disk platters cut in
> half?) and placed
> in paralell with the tank cap. tuning could be done while
> powered up and
> would be as simple as turning a wheel... you could also keep
> the coil in
> tune as spark length/capacitance to earth increases as arcs
> are drawn off.
> is this a new idea or has some one allready thought of it in
> the past and
> put it in the "couldnt be bothered" corner?
>
> ben



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