Re: UK Neon Sign Transformers

• To: tesla-at-pupman-dot-com
• Subject: Re: UK Neon Sign Transformers
• From: "Steve Young" <youngs-at-konnections-dot-com> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Fri, 16 Oct 1998 20:25:22 -0600
• Approved: terryf-at-verinet-dot-com

Reinhard and all,

Don't give up on MOTs!
  
<SNIP> 
> 
> My testing has also shown me that MOTīs are not suitable for TC work. In
order
> to protect seriesīd MOTs (if you can find ones that will stand up to
> seriesing) you need a safety gap across EACH MOT and run them under oil.
A
> single safety gap across all MOTs will NOT (NO!) protect them. I speak
from
> experince. A MOT (or two) would be intersting for a toob TC,tho. But for
our
> DWC coils they arenīt worth a darn.
> 
> Coiler greets from germany,
> Reinhard
> 
 I agree MOTs in series are asking for trouble due to voltage stresses. 
However, MOTs can still be a good power source for TCs IF you use DC. 
Consider two MOTs with their grounded cores tied together.  Each MOT drives
a half wave voltage doubler of opposite polarity.  You end up with 9 to 11
KV DC at a couple KW between the outputs of the two doublers.  You have to
use care with the rest of the primary circuit as both outputs are plus and
minus about 5 KV with respect to ground.  Doublers can be microwave oven
diodes and caps--you will need to dismantle a bunch of salvaged ovens to
get enough parts.  (Talk to a thrift store about getting bad ovens--usually
the HV parts are still OK.)  The composite output caps will have to be 4 in
series/parallel to withstand the about 5 kv across them.  My supply uses 4
diodes and 10 caps total.

Convert to D. C.,

Steve Young

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