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Re: Useful HV PSU's from x-ray equipment



Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>

Daniel,

Well, yes and no :^) There won't be much difference in the output
sparks of the transformer with the diodes in place (DC) as op-
posed to them removed (AC). However, as Mike stated, con-
tinued shorting of the output, even with proper ballasting, will even-
tually kill the diodes, which will result in the output going to prac-
tically zero. At this point, the only remedy is removing the diodes
and going AC. Once an x-ray tranny is made AC, it becomes much
more "robust"  ;^)

David Rieben

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, April 30, 2005 10:32 PM
Subject: Re: Useful HV PSU's from x-ray equipment


Original poster: "Daniel Koll" <dk_spl_audio@xxxxxxxxxxx>

Oh ok, I will remove the diodes when I get a chance. Will doing this improve arcs? Thanks

From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: Useful HV PSU's from x-ray equipment
Date: Fri, 29 Apr 2005 07:42:41 -0600

Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>

Sounds like the output is still in dc mode. If you take it apart and remove the rectifiers it will be ac. With small transformers like that (prob rated 10 mA or so, might be able to get 30-40 mA for short runs without frying it) you will still get the 60 Hz buzz, but with 10 mA it won't pull much farther than the starting distance (like an obit). Dead shorting it in dc mode will eventually kill the rectifiers.

Mike
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, April 28, 2005 7:19 PM
Subject: RE: Useful HV PSU's from x-ray equipment


Original poster: "Daniel Koll" <dk_spl_audio@xxxxxxxxxxx>

Cool! I just got a Xray transformer. It is not nearly as big as those though. I would say about the size of two 15/30 NSTs. It is filled with oil and probably weighs around 35lbs. It works on 115VAC mains or pusled DC (seperate terminals). It also has a spot to connect a ammeter (if not used you ground this terminal to case). I hooked it up and it produced a very loud 3-4" blue arc. The arc was very different than NST arcs though. I took a picture and the one arc was made up of many small blue streamers.
The freq must have been higher than mains. The wierd thing was that once I established an arc I could not hold it and "pull" it apart. The max length was about the length that it could jump in air, not sure why? Oh yeah, forgot to mention, I was limiting current using a MOTs primary.