Re: [TCML] DC SGTC charging inductor

[Mark X2 <susax2@xxxxxxxxx>]

Thanks Ted,
I might be mistaken, but isn't saturation caused by a too low turns/volt
ratio?
Current will be max 30 mA, depending on the flyback's voltage drop, so no
worries there.
Do you think a series of 4 fluorescent lamp ballast might be any good or a
waste of time?





2013/2/18 Tesla <tesla@xxxxxxxxxxxxxxx>

> Hi
>
> I suggest using another MOT secondary , Break open the E/I by using a
> hacksaw, I put about 0.3mm piece of plastic in there and then glue it
> together with a building adhesive like "no more nails"
>
> modified in this way they do not saturate nearly as much and over 1 amp of
> DC is possible. Arraying these in series and parallel combinations to get
> the required  inductance and DC current ability can then be done. I lost my
> measurements of MOT's modified in this way and can only recall the
> inductance was about 10 Hy, this is easy to check by exciting the MOT with
> a modest AC voltage (30 to 120)  and checking the current draw. The
> inductance will be somewhat less when it is used as a charging inductance
> due to the DC flowing in the core BUT the gap ensures the inductance does
> not reduce too much
>
> Hope this assist
> Ted L in NZ
>
> -----Original Message----- From: Mark X2
> Sent: Sunday, February 17, 2013 9:28 AM
> To: Tesla Coil Mailing List
> Subject: [TCML] DC SGTC charging inductor
>
>
> Hi all,
>
> I'm experimenting a bit with a small spark gap Tesla coil to get acquainted
> with dc resonant charging.
>
> The HV source is a HVDC tester which has a huge 250W flyback and the
> primary cap is a string of 10 942Cs.
> For the de-Q-ing diode I intend to use 3 microwave oven diodes in series.
>
> But I'm going to need some pointers on how to build a proper charging
> inductor,
> like size, app. number of windings and HV-insulation. Any advice is
> welcome, thanks.
>
> Mark
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