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Dead Spellman PTV50N200 - where to start?

... switch to the line power and re-routing the high-impedance current and voltage monitor outputs through a pair of op-amps so I could drive a meter. ... 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 ...
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

... circuit to get only 5 volts into the arduino until the sensor's output voltage drops down below 5 volts. You place a 470 ohm resistor in series ... 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 ...
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

... "black box" that takes an input and steps it up to a higher voltage output. I've been reading Faraday and Maxwell in an attempt to understand ... 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 ...
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: 3966

Re: Power Supply Completion

... fine. I assume you will have some kind of big HV divider to measure the voltage output. Just make sure that you don't turn your variac up (if it ... 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 ...
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

... two diodes in series will perform only up to the RMS of their exposed voltage; ie. well under 80 kV (so, to first oder, 57 kV should be your 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, ...
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!

... however. You can post questions about how to wire your high voltage x-former in the fusor power section (High voltage section.) Also, ... 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 ...
by Dennis P Brown
Thu Jun 29, 2017 10:03 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!

... 20 - 25 kV range with good detector systems.) Until you can handle high voltages, consider experimenting at far lower voltages but in no case, exceed ... voltage. You need to really understand high voltage systems and related safety - issues such as proper (fail safe) chamber grounding, properly ...
by Dennis P Brown
Fri Jun 23, 2017 5:49 pm
 
Forum: Please Introduce Yourself
Topic: Greetings!
Replies: 16
Views: 729

Re: Precipitator power supplies?

... Of course, the diode as you may or may not know is seeing a higher peak voltage than the max rated voltage for the supply (for any AC powered device) so these diodes must be rated for the higher voltage with some safety factor. As for grounding, that is an issue but that depends on the supply ...
by Dennis P Brown
Wed Jun 07, 2017 12:41 pm
 
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Precipitator power supplies?
Replies: 13
Views: 476

Re: Linear IEC Device

... this would be, but I like it! incidentally, capacitors will surely have safety factor so you don't actually know the voltage cap. Try an oil burner ignition transformer. They are basically like an NST. While ...
by ian_krase
Tue May 23, 2017 5:56 am
 
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Linear IEC Device
Replies: 11
Views: 914
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