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Re: Power curve

You wrote: 

>Hi all,
>         I was interested to read Mark B.'s solution to this.
>> My plan for my big coil is to voltage double (with diodes and caps) 
>the 
>> 18KV from the transformer to produce about 45KVDC which I will feed 
>to 
>> the primary cap through a charging choke and series diode (I 
>already 
>> have these devices).
>
>Mark, would you mind posting the type numbers and ratings of the 
>diodes you are going to use please ?
>
>Malcolm
>

Yes, but don't laugh.  We made a number of these diodes some years 
back.  Each diode consists of fifty 6A100's in series.  These look like 
a fat 1N4000 type plastic diode and are not expensive.  They are 6A -at- 
1000V each, making each assembly 6A at 50,000V.  Each diode has a 1Meg, 
2W resistor and .005uF, 1.5KV ceramic disc capacitor in parallel with 
it.  We had a 4 man diode weaving party one day and just put them all 
together.  The component strings are stuck down 2" PVC pipe with end 
caps with leads.  A piece of tape wrapped near one end of the pipe 
marks the cathode.  They look like diodes from _Land of the Giants_.

My original setup on the big coil was DC.  I rectified the 18KV 
transformer (45KVA rating) using a 4 diode full wave bridge.  This was 
run to a choke input filter with a 7uF, 40KV capacitor.  The capacitor 
then went through a charging choke and series diode to the primary.  As 
I said before, I used too large a primary capacitor, and suffered from 
poor efficiency.

You had to ask,
Zap,
Mark