RE: [TCML] 20KV transformer ? (UK)

["Derek" <tesla@xxxxxxxxxxxxxxxxxxxxxxxx>]

Chris
Why not use your two NST's in parallel into a voltage doubler making a 20 Kv
DC supply, this does actually charge two cap banks in series one in the -ve
cycle and the other in the +ve cycle.

Or (if you have a rotary) rectify the two nst's and use a large charging
choke and a d-queuing diode. This  will give you roughly double the input
voltage when the coil is running.

or use both ideas to give you 40KV...

Alternatively if you have 4 mot's remove the HV windings and use 2x mains
windings on each of 2 MOT cores to make 2 isolating transformers so you can
drive your two nst's in series. The centre connection of the two nst's (not
the cases) connected to earth. 

Do not earth the cases, and be very careful in operation as the case of each
will be at 5Kv WRT Earth

	Cheers
		Derek  

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Chris Swinson
Sent: 14 November 2007 15:27
To: Tesla Coil Mailing List
Subject: [TCML] 20KV transformer ? (UK)

Hi all,

looking for a 20KV 50mA supply if anyone can help. I have 2 10KV NST's here
which I use, though I can't link those in series as they are centre tap to
ground anyway :-(  So wonder if there is any 10KV types which can be linked
in series for 20KV.

Was also wondering if the output voltage could be increased without a large
charging choke. Would there be any way to charge up 2 cap banks in parallel
and discharge them in series to get 20kv ? I half have an idea of instead of
running at 100bps run at 50bps and gain a charge in 1 cap on positive mains
cycles and charge the second cap on the negative mains cycles ?

cheers,
Chris 

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