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Re: [TCML] Check the Discharge Time of my Bleed Res



While a close simulation, this is not a completely valid test.  HV corona is
part of the discharge process, especially off some of the sharp points
on the wired and soldered connections.

Dr. Resonance



On Thu, Oct 9, 2008 at 1:20 PM, P Tuck <follies@xxxxxxxxxxxx> wrote:

>
> Hello All
>
> Terry wrote:-
> >>Just charge the whole cap to say 10V or any battery voltage laying
> nearby.
> Then disconnect the battery, count to ten, and go probing around >>with the
> good ol' meter for any caps that have a significant fraction of voltage on
> them.
>
> Yes they all seem ok.
> ______________________
>
>
> Dr Res wrote:-
> >>.  I bet the xmfr winding impedance, with center tap from each hot to
> ground, wil be equally effective is discharging all the
> >> caps at nearly the same rate.
>
> I wondered on this myself, and I had also seen in the archives that there
> are differing ideas on this. I used resistors to play safe in the end. I
> had
> also read of caps regaining a charge, I was surprised at this, but assume
> it
> must be true. And as I am in the process of construction and none of the
> wire connections are permanent (I was handling the disconnected MMC today)
> this was another consideration.
> __________________________
>
> Dr Res wrote:-
> >>I will be very interested to hear of the outcome of your research.
>
> Unfortunately the MMC is all soldered up now, so I can't report whether
> just
> the NST would have sufficed.
>
> I come from a telecommunications background and I've had more than my fair
> share of unpleasant LOW voltage shocks, back emf from relays and line
> ringing AC with wet hands etc, so HV shocks hold no appeal for me
> whatsoever!
>
>
> Philip
>
>
>
> -----Original Message-----
> t = 5 RC for approx for near total discharge.
>
> Also, if possible, please test the voltage with no bleeder resistors across
> it.  I bet the xmfr winding impedance, with center tap from each hot to
> ground, wil be equally effective is discharging all the caps at nearly the
> same rate.
>
> I've always advocated using bleeders on DC charged caps, but in a TC
> circuilt, using a nst with alternating current, any charge bleeds off thru
> the ends thru both of the xmfr windings to the center tap which is
> grounded.
> I've never ever used any bleeder resistors in any TC I've ever built and
> have never received or detected any stored charge.
>
> some experimenters have reported stored AC charge using an equi-drive
> configuration but I have not tested this so unable to comment on it.
>
> I will be very interested to hear of the outcome of your research.
>
> Dr. Resonance
>
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