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Re: [TCML] High voltage diodesd

As a general rule, in HV design you should use as little insulation as possible, since dielectric surfaces charge up and distort the desired fields and create sliding sparks. Voltages can jump 4 or 5 times as far on a dielectric surface as in air. Attachments of dielectrics to metal should be done in low-field regions. 

---Carl





On 9/9/2015 3:55 PM, Matthew Sweeney wrote:

Yeah i built one before but i have a set of these nst sitting here needing
a use. With current limiting i think ill be safe there is no possible
conductive path up to the collecter and i use lots of insulating. Im
specifically interested in how a positive and negative vdg will interact
because i see noticeable differences when i switch the polarity on my
single vdg.

All my rectifying and current limiting components will be potted and i use
HV cable upto 40K just to be sure. And that all goes in a plastic container
covering the entire bottom section including motor, rollers etc.
On Sep 9, 2015 3:42 PM, "ExtremeElectronics.co.uk" <
tesla@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:


Why not use a fly back, If you look around you can find them with a
tripler that will give you 30-40KV DC.
The only down side is that you can't reverse the current

There were some cheap ionizers on ebay a while back, they might be a good
start too.
For safety I'd aim for low voltage powered HV devices. I'd be very wary of
using an NST. In a fault situation or a HV DC discharge from the VDG to the
NST output, they could create a high current path to whatever the VDG was
connected to, or arcing to at the time. This could easily be lethal.

Derek



On 09-Sep-15 6:11 AM, Matthew Sweeney wrote:


Oh I forgot to mention, any good suggestions for current limiting here?
30ma is far too much for a VDG am I'm sure most of it's going to be wasted
anyway. Do i need a good old variac or some other cheaper alternative?
Will
a light dimmer really work i this situation?

Thank you!

Matt Sweeney


On Wed, Sep 9, 2015 at 12:01 AM, Matthew Sweeney <msweeney23@xxxxxxxxx>
wrote:

Hello, all does anyone know a good source for HV diodes for rectifying

NST? Specifically up to 15KV at 30ma I would assume I need to account for
RMS so probably around 20KV.

I think I can get away with just one for half wave and maybe a cap for
smoothing it a bit, but that would need to be a pretty decent cap to deal
with 60HZ at that voltage.

I'm using this to build a HV DC fed VDG does anyone have any hints or
suggestions? I know I can find both diodes and caps in microwave ovens
but
its a pain to pull them apart and they are commonly too low voltage.

I have found a few online retailers just wondering if there may be an
alternate source, or anyone have some for sale etc.

Thanks for any help!

Matt Sweeney

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