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Re: [TCML] DC base driven coil
In a message dated 3/12/2008 6:28:15 P.M. US Eastern Standard Time,
>In that case, we're talking about at least a coupla uF? And all the base
>current of the secondary flowed through this cap to ground?
In some of Lou's writing, he implies that a 0.10uF cap might work well
at 500kHz. He suggests that an 0.01uF cap may also be OK but
would show a higher impedance at that frequency.
Since Lou preferred to apply 40kVDC to the capacitor, I suppose the
cap should be rated higher than this to give a margin of safety.
Lou said that the charging system worked as a relaxation oscillator
by adding a choke in series with the capacitor to create a time constant
which controlled the firing rate. Typically, this firing rate would be much
lower than the break rate of the TC itself, if I remember correctly.
> What ratings would a cap like this have to have? Ten of the CDE .15/2kV
>942 series in parallel would handle the current, give you 1.5uF, and would
>obviously be suitable for the frequency. But what voltages would they see?
> Since the streamer grows with each bang, how does the DC cap "know
>to discharge? Does its charging supply add to streamer growth?
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