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Dead Spellman PTV50N200 - where to start?

... of op-amps so I could drive a meter. I had not yet attached it to my vacuum system due to lack of an adequate feedthrough and because to ensure safety (and to fit it on my bench) I needed some careful grounding, etc arrangement -- and added a resistive ballast of around 50 Kohm. Arcs that can ...
by ian_krase
Wed Aug 02, 2017 8:30 am
 
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Dead Spellman PTV50N200 - where to start?
Replies: 7
Views: 150

Re: MKS 901p

... tracks the input voltage ~4.6v or so to zero. You could use a precision zener at 5 volts which the Arduino would be happy with, but I like a safety zone afforded by a 4.8 volt zener. If you do not follow this discussion perhaps you might go with the serial suggestions. This is just how I ...
by Richard Hull
Wed Jul 26, 2017 5:00 am
 
Forum: Vacuum Technology (& FAQs)
Topic: MKS 901p
Replies: 38
Views: 691

Re: The Beginnings of a Fusor Electrical System

... broken piece of equipment (and, yes, also as a request for guidance). Maybe the questions I ask, withholding all my assumptions to ensure safety, have lead to the perception of a lack of knowledge. I just want to let you all know I'm not a complete idiot with respect to electricity, and ...
by Duncan Wilkie
Sun Jul 23, 2017 4:30 am
 
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: The Beginnings of a Fusor Electrical System
Replies: 50
Views: 3965

FAQ - What about a lathe?

... a 6 jaw chuck for big un-supported work close to the head stock. Never had one flip out on me in a 6 jaw! This is charged to lathe operational safety. The novice might want to tailstock support big diameters in their 3 jaw chucks, even if only 3" long. Many of my hobbies from model railroading ...
by Richard Hull
Sun Jul 23, 2017 3:54 am
 
Forum: FAQs: Fusor Construction & Operation
Topic: FAQ - What about a lathe?
Replies: 0
Views: 113

Re: Power Supply Completion

... I'm not sure why you have a MOT ballasting the primary circuit. Where did you get the idea to do this? I could see it may be good as kind of a safety series load while trying to figure out the transformer connections but I don't know why you'd need it in normal operation. The idea of putting ...
by Rex Allers
Sat Jul 08, 2017 8:45 am
 
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Power Supply Completion
Replies: 5
Views: 270

Re: Power Supply Completion

... wave bridge for my x-former; that required four 40 kV diodes and my max 32 kV and that is a bit over the limit for these diodes but there is a safety factor that I use (and really shouldn't); so, if you do go full wave, your max voltage for your 40 kV diodes should be no higher than this value. ...
by Dennis P Brown
Fri Jul 07, 2017 11:58 am
 
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Power Supply Completion
Replies: 5
Views: 270

Re: Greetings!

... can be dangerous if one is really careless - I am not saying they are fool proof.) Calculating the stopping thickness of slate for a 80 keV X-ray (safety factor!) is trivial (called google.) Slate can be drilled so bolting in place is easy as is stacking. I will say that remote operation is not ...
by Dennis P Brown
Thu Jun 29, 2017 10:03 am
 
Forum: Please Introduce Yourself
Topic: Greetings!
Replies: 16
Views: 729

Re: Greetings!

... sometimes 1 -2 amps of DC is all it needs to saturate the core and BANG Darkness You need a mentor before going further ---for your own and others safety
by John Futter
Thu Jun 29, 2017 2:03 am
 
Forum: Please Introduce Yourself
Topic: Greetings!
Replies: 16
Views: 729

Re: Some Diffusion pump Questions

Coax cable provide a safety ground. Intrinsically safe, and for modestly high voltage good coax is often much cheaper and more available than High voltage wire.
by ian_krase
Wed Jun 28, 2017 9:22 pm
 
Forum: Vacuum Technology (& FAQs)
Topic: Some Diffusion pump Questions
Replies: 21
Views: 740

Re: Greetings!

... top range (over 70 kV) and those that do are very experienced with high voltage. You need to really understand high voltage systems and related safety - issues such as proper (fail safe) chamber grounding, properly insulated cables (rated for the max voltage/power), and feed-thru's (very power ...
by Dennis P Brown
Fri Jun 23, 2017 5:49 pm
 
Forum: Please Introduce Yourself
Topic: Greetings!
Replies: 16
Views: 729
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