Hi Raymond, I did this using strings of cheap Microwave oven diodes potted
in short PVC tubs with paraffin wax. I also added some high wattage 1M
resistors for my own safety.
Basically I created large, clunky, cheap 30KV-50KV diodes :)
It worked well, but I think the diodes would be better off in epoxy
specific for the context. Rectified DC off an NST is a different beast and
kinda scary for me :)
I was using this to drive a VDG, but the voltage was too high and it's very
much overkill!
Good luck!
On Fri, Jun 22, 2018, 5:35 AM Raymond Spigot <raymond.j.spigot@xxxxxxxxx>
wrote:
> Hi, thanks for all the interesting discussion about NST testing and safe
> grounding, it's all been instructive for a noob
>
> I have this grey resin block neon transformer in the shed I was thinking of
> experimenting with. It's a 15kv/30mA one with a midpoint ground
> connection. Is there a way to rectify the output so I can use it for
> trying out powering a dc tesla?
>
> I have a big bag of diodes (1N5408 I think) that were pretty cheap. If
> they'll handle 1000v each I could solder them up into long strings and use
> 4 strings of diodes to make a bridge rectifier? I guess I'd need a
> capacitor on the other side of the bridge as well though to smooth it out a
> bit.
>
> Then I was wondering if there was another way to do it with a midpoint
> grounded transformer like mine. I'm thinking the 2 secondary windings on
> the transformer must be out-of-phase, but could I rectify them
> individually? Between each HV output and the midpoint ground I mean. Then
> I'm thinking I'd need 2 bridges but they're only trying to rectify half the
> voltage each and it would be easier to cope with.
>
> Basically I'm hoping there's a way to get like 10kv dc out instead of
> closer to (I think) 20kv Because then I can buy a main MMC capacitor that
> doesn't have to be rated for the highest voltage (so I can put less caps in
> series)
>
> hope this makes some sense to someone! thanx for advice anyway
>
> Ray
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