Search found 943 matches

by Rich Feldman
Thu Jun 14, 2018 6:12 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 277 volt power at home
Replies: 4
Views: 553

Re: 277 volt power at home

Hey Bob! An ad-hoc boost transformer, cascaded with an ad-hoc autotransformer, has produced a tolerable example of 277 VAC at home with no variac, no 240 volt plug, and no semiconductors. It being a problem that only a transformer nut would enjoy, it sure helps to have a transformer collection in th...
by Rich Feldman
Tue Jun 12, 2018 6:48 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Dysprosium activation runs planned
Replies: 6
Views: 388

Re: Dysprosium activation runs planned

Hooray for Richard, persevering in the Virginia heat to squish dysprosium coins and get activation data ! Sounds like separation & purification of the rare earths is pretty new in the history of metallurgy. Not wanting to hijack your thread, Richard, here's a related story about zirconium. In the gr...
by Rich Feldman
Tue Jun 12, 2018 3:25 pm
Forum: New User Chat Area
Topic: Thermocouple Gauges VS Vacuum Gauges
Replies: 8
Views: 907

Re: Thermocouple Gauges VS Vacuum Gauges

Good to see you back, Lance. That "micron gauge", sold for refrigeration service, AFAIK is a thermocouple or Pirani gauge with integrated, battery-powered digital readout. Maybe Kuba or Noah, or someone else with a users manual, can check for us. It would be handy to have a gauge with no wiring to c...
by Rich Feldman
Mon Jun 11, 2018 4:16 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Dysprosium activation runs planned
Replies: 6
Views: 388

Re: Dysprosium activation runs planned

Fusors and rolling mills, how about that! Is physical thin-ness desirable to reduce the activated metal's self-shielding of decay radiation? There's stainless steel foil sold for wrapping air-sensitive materials in the furnace, when things need that kind of annealing. Certainly not news to an old je...
by Rich Feldman
Mon Jun 11, 2018 3:54 pm
Forum: New User Chat Area
Topic: Diffusion pump power wire convert
Replies: 7
Views: 304

Re: Diffusion pump power wire convert

Heaters, as a rule, heat the same amount on AC or DC. That's why RMS values are used when talking about AC voltage and current, since 19th century. AC makes life easier for switches.
by Rich Feldman
Sun Jun 10, 2018 7:24 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 277 volt power at home
Replies: 4
Views: 553

Re: 277 volt power at home

Right-o, Bob! Small buck or boost transformer stories to follow, but not before the real-world exercises. Here's the ballast I got Friday night, from the very last luminaire. Its 43" long lamp was broken. In its place is a 29" "stubby" lamp previously salvaged from a different unit. Yellow glow hurt...
by Rich Feldman
Sun Jun 10, 2018 6:18 pm
Forum: Please Introduce Yourself
Topic: Hello
Replies: 4
Views: 174

Re: Hello

Welcome. Applause for introducing yourself and using your real name.

Re. p-B11 fusion: Learn to use the fusor.net search tool, and RTFF.
by Rich Feldman
Sun Jun 10, 2018 6:15 pm
Forum: New User Chat Area
Topic: Diffusion pump power wire convert
Replies: 7
Views: 304

Re: Diffusion pump power wire convert

The diffusion pump in Korea looks fine, and even includes a throttle valve. I don't know anything about special power controllers for it. If the voltage is OK, as you said, then conversion might be simply changing the plug to fit your wall outlet, or your variac. The Korean price number means nothin...
by Rich Feldman
Sun Jun 10, 2018 3:10 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 277 volt power at home
Replies: 4
Views: 553

Re: 277 volt power at home

Yay! First suitable variac in the shed was not the 240 volt unit with motorized adjuster, it's a dual 120 that I'd forgotten about, and never used. Serious Tesla coilers like RH probably know the type. Nameplate of lower unit says STACO ENERGY PRODUCTS CO. / DAYTON, OH. U.S.A. / INPUT: 240 V 50/60 H...
by Rich Feldman
Sat Jun 09, 2018 9:20 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 277 volt power at home
Replies: 4
Views: 553

277 volt power at home

Just took another step toward what might become a real fusor power supply. Have long wanted 277 volt power for some nice new 60 mA NST's, bought cheaply on ebay 'cause of their primary voltage. Then last month, the 277 volt parking lot lights at work were changed from sodium to LED. Facility manager...