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

["Tesla list" <tesla@xxxxxxxxxx>]

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

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



----- Original Message -----
From: Tesla list <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, February 21, 2005 6:43 PM
Subject: Re: DRSSTC - I think I heard Cross Conduction...


> Original poster: Sue Gaeta <sgsparky@xxxxxxxxxxx>
>
> Hi Colin,
> Your comment about noise reminded me of something else that was happening
> while I was using the larger topload.
>
> I always hold a piece of metal in my hand when I do these tests so that I
> can touch various equipment with it instead of my bare unprotected skin.
> This prevents me from getting those little "RF bites" everytime I touch
the
> power switch, or whatever. It is my own little "bonding on" approach. I
> also try to draw little arcs off the ground braid to see how much RF I am
> picking up. I noticed that with the larger topload, I was picking up much
> more RF. Not only that, but everytime I moved, the output would change
> slightly. These effects went away when I switched to the smaller torroid.
> This indicates that the noise in the electronics could very well be caused
> by radiated emissions. It makes sense, more metal on top will act as a
> better radiator than the little torroid.
>
> I do use a line filter on the power cord that supplies the H bridge, but I
> don't have one on the driver supply cord. This could be an "uh oh" if I
get
> brave enough to feed this thing more power. I haven't gone above 130 AC
> input yet. These filters work both ways, and would most likely eliminate
> any noise picked up by the line cord. The ones I own have both common
mode,
> and differential chokes. I think most of the commercial ones are made that
> way.
>
> A shielded line cord could be another good solution. If I ever got a coil
> working as good as these other guys out there I think I would also need it
> in case a streamer hits the line cord. I don't have to worry about that
> right now though. Not even close!
>
> Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: "colin heath"
>
> hi sue,
> When I build the bigger H bridge, I have to look into why I can't
> use as
> much top loading as Steve W. uses. I have enough extra turns available to
> get it in tune, but I get smaller sparks, and it draws much more current
> :-(.
> Sue
> i to have found this with my coil. as well as drawing more current the
> problem with noise on the electronics gets much worse!
> cheers
> colin
>
>
>
>