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



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 > > >