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RE: Level shifter problems

Original poster: "David Dean by way of Terry Fritz <twftesla-at-uswest-dot-net>" <deano-at-corridor-dot-net>

Hi Weazle,

First, do you have a connection between the center tap (cores of the MOTs)
and the center of the diodes? It should be there. Second, the MOTs need to
be phased so that the outputs are opposing, that is one is going negative
while the other is going positive. If both MOTs are phased the same you will
get low output. Try switching the primary leads on one of the MOTs and see
if that helps.


> Original poster: "J. B. Weazle McCreath by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <weazle-at-hurontel.on.ca>
> Hello Coilers,
> I've been working on putting together a new power supply and SRSG for my
> coil based on the MOT level shifter circuit that Henry Hallam has used.
> For some reason I can't get it to work.  I've checked all of the various
> individual components and all seems OK, but I get very low output voltage
> from the level shifter.
> The two MOTs are 2100 Volt units of identical manufacturer, as are the
> diodes and capacitors.  The protection circuit is as per Terry's site
> with a total of 1000 ohms in each leg.  The bypass caps are 500 pF. at
> 30 K.V. doorknobs.  I've checked and re-checked the wiring and can see
> no reason for it not working, but I'm only getting about 2 K.V. across
> the gap, which obviously isn't enough to fire it.
> Ideas anyone?
> 73, Weazle, VE3EAR/VE3WZL
> Listening: 147.030+ and 442.075+
> E-mail:    weazle-at-hurontel.on.ca
>            or ve3ear-at-rac.ca
> Web site:  www.hurontel.on.ca/~weazle