Re: DRSSTC - I think I heard Cross Conduction...

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "colin heath" <colin.heath4@xxxxxxxxxxxx>

hi sue you said

When I put the 10K in series with the CT, I had absolutely no
problem at all. It's like too much feedback was overwhelming, and I seemed
to remember seeing a huge spike when there was no resistor.

this is probably my problem then. both times iv used one i didnt use the
resistor and
got the same thing with noise and going c/w!!! well ill add it in as this is
probably whats
been pumping my system with r.f.

cheers
colin

----- Original Message -----
From: Tesla list <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, February 22, 2005 2:37 PM
Subject: Re: DRSSTC - I think I heard Cross Conduction...


> Original poster: Sue Gaeta <sgsparky@xxxxxxxxxxx>
>
> Hi Colon,
>
> Antennas and TCs give me the willies! When I was using an antenna, some
> strange things would happen, like odd screetching noises that made it
sound
> like it was possessed. That was one reason for naming it "The Beast". I
> have had great results with a commercial CT that was a dumpster diving
> prize :-). It is a Vitec 57P1688. These are used in switchmode supplies,
> and it is ideal for the frequency range that we work with. The Data sheet
> is online somewhere.
>
> You just need the correct phasing and feedback level and you're in
> business. If your coil fails to start, just swap the wires on the
CT(either
> the primary or secondary-not both).You need that 10K resistor in series
> though (Dan's schematic shows this). When I left out the resistor, I would
> get erratic operation, and one time as I turned the power up the
> interrupter cut out, and I got CW operation! However I shut down very
fast,
> and when I powered up again, The interrupter worked fine. That was
probably
> due to noise. When I put the 10K in series with the CT, I had absolutely
no
> problem at all. It's like too much feedback was overwhelming, and I seemed
> to remember seeing a huge spike when there was no resistor.
>
> Before I made improvements to my coil, I actually needed more feedback. I
> had to wire two of them in series parallel to get the coil to start. Then
> this slowly became too much as I made improvements. First I needed to cut
> back to one CT, and then later on I needed the 10K. If you change one
> parameter somewhere, expect something else to change somewhere else.
>
> Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: "colin heath"
>
> hi sue,
> you said
> The ones I own have both common mode,
> and differential chokes. I think most of the commercial ones are made that
> way.
> yes they are mostly made that way. i only noticed as iv just read up on
> filtering and common/differntial filtering.
> my coil will have filter on the control electronics mains setup. this
should
> stop anything coming back from the bridge.
> im also using armoured flex cable which makes a nice shield for the
wiring.
> the whole setup will be in a shielded enclosure.
> i have a feeling that using c/t method is asking for trouble with noise
also
> as i havent got one running properly on one yet but have got all my coils
> running fine on antenna.
> cheers
> colin
>
>
>