Re: [TCML] DC SGTC charging inductor

[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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