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Re: [TCML] rectifying my NST

Well, yes, you certainly could, but as to whether or not this would be a practical Tesla coil power supply or whether the Tesla coil would function properly - 'um no. A Tesla coil circuit needs a STEADY supply of high voltage AC or filtered DC of sufficient power to nearly fully recharge the primary capacitor within a few hundred microseconds, multiple 10's to 100's of times every second - hardly indicative of the typical, once every several second pulsed output of a Marx generator. 

David
----- Original Message ----- From: "James Janota" <j.janota@xxxxxxxxxx> To: "Yurtle Turtle" <yurtle_t@xxxxxxxxx>; "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> 
Sent: Saturday, June 23, 2018 8:06 PM
Subject: Re: [TCML] rectifying my NST



Can you place a Marx generator to the primary on a Tesla coil?

Regards

James Janota
(727)512-7112 Phone
(727)595-6625 Fax
On Jun 23, 2018, at 15:39, Yurtle Turtle via Tesla <tesla@xxxxxxxxxx> wrote: 

I used these on my 15 kV 120 ma NST. I think they are rated 150 kV 1 amp.
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On Saturday, June 23, 2018, 8:50:18 AM EDT, David Rieben <drieben@xxxxxxx> wrote: 

 Charles,
Wow! 36” spark! That’s impressive. I happen to have a surplus x-ray transformer (with its internal diodes still intact) that I currently already have set up to be fed with the current ballasted 0 - 280 VAC output from my large Tesla coil control panel that would serve admirably for feeding a ‘man-sized’ Marx generator. I have toyed with the idea of building a big Marx bank before, but the challenge of its sound construction, both from an electrical as well as a mechanical standpoint, the unlikely prospect of procuring all of the required matching HV Caps and resistors on the surplus market and the consequential cost associated with obtaining the same on a retail market, and the total lack of space to safely operate such a beast have pretty well placed that project on the back burner for now. :-/ 

David

Sent from my iPhone


On Jun 22, 2018, at 8:26 PM, charles rakes <crakes29@xxxxxxxxx> wrote:

I use a 15Kv 60ma NST with 30 diodes in series on each output hot
terminal.  One string with a negative output and the other with a
positive. I get over 22KV DC output that I use to drive my dual 15 stage Marx generator and get about 36-inches spark between the two towers. The 
NST's primary is controlled by a variac.

On Fri, Jun 22, 2018 at 2:14 PM, Matthew Sweeney <msweeney23@xxxxxxxxx>
wrote:
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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