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Re: Test Coil, bi-dir RSG2

Original poster: "Chris Rutherford" <chris1@xxxxxxxxxxxxxxxxxxx>

Hi All,

I've now got a variable speed RSG, its made of bidirectional rotating disks powered by a pair of DC radio control car motors, it looks nice and sparkly :-)

www.hackinghardware.com/rsg2.jpg
www.hackinghardware.com/sparkoids.avi

It has a rotational speed range of 0 to about 3000bps (8*8*RPM/60), and I've not yet fried my NST (now 2 in parallel giving 500VA).

I've taken 2 photos of my scope, one is where I get no breakout on my secondary, and one where I do (at different speeds). As you can see on the first photo, it looks like the 3rd node is dumping all the power back in to the primary where it is 'disapearing'. The second is where I get breakout, and it looks to be operating in the 2nd node area, can anyone confirm this? Is it possible to get a first node system, or is it too hard to do using spark gaps?

www.hackinghardware.com/nodes.jpeg

Thanks

Christopher

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, July 04, 2005 7:17 AM
Subject: Re: Test Coil, strange spark


Original poster: Mddeming@xxxxxxx
In a message dated 7/4/05 12:13:21 A.M. Eastern Daylight Time, tesla@xxxxxxxxxx writes:
I have an
inductive fliter protecting my NST. Has anone experenced secondary node
ring down causing voltage peaks on the primary circuit? What could be
causing this occasional long spark?

I need to start work on a variable speed RSG.  i.e. Try to get 1st node
quencing with a magnetic pulse aswell as an RSG?  Has anyone tried
combining the two..

Here is a 10 second exposure of my 250KVA fixed frequency RSG.

http://www.hackinghardware.com/firstlight.jpeg

Thanks

Chris

HI Chris,

Two points of concern:
1. Inductive filters often cause intermittent spikes in TC power supplies by introducing additional resonances.
2. Variable RSGs are often fatal to NSTs.
In explanation of these phenomena much has been written; see the list archives.

Hope this helps,

Matt D.