Search found 969 matches

by Rich Feldman
Fri Aug 17, 2018 5:38 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: DIY hermetic feedthroughs: Has anybody done this?
Replies: 4
Views: 186

Re: DIY hermetic feedthroughs: Has anybody done this?

Speaking of fused glass to metal, I've got a tiny jewelry project that could use a black vitreous enamel finish. The substrate, a short thin tube, can be made from copper or steel. Colored frit is available over the counter in 8 oz jars or bigger. Online (e.g. Etsy) in 2 oz packs. But my whole proje...
by Rich Feldman
Thu Aug 16, 2018 5:10 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 277 volt power at home
Replies: 9
Views: 2096

Re: 277 volt power at home

Excellent question, Dennis. Answer below. Thank you for stepping into the role of project manager here. :-) Before taking apart the most recent demo, I increased the load current. At full blast this morning: 321 V, 8.75 A, 2800 W. Replaced one 1000W halogen lamp with a conventional 1500W light bulb,...
by Rich Feldman
Mon Aug 13, 2018 8:13 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 277 volt power at home
Replies: 9
Views: 2096

Re: 277 volt power at home

Found time yesterday to set up a respectable load on "boosted 240 volt" power from the wall. Marking new territory for me, the measurements went up to 326 volts at 7.9 amps (2575 watts). Here are the details, in case anyone's interested. The exercise used materials picked up at the flea market in Ju...
by Rich Feldman
Thu Aug 09, 2018 3:37 pm
Forum: The Trading Post
Topic: 10x CHEAP TURBOS w/ controller (Pfeiffer TMH 261) on ebay ~$50
Replies: 9
Views: 601

Re: 10x CHEAP TURBOS w/ controller (Pfeiffer TMH 261) on ebay ~$50

Thanks for the tip, Andrew.

The seller's shipping fees are around $60. I rashly and impulsively placed one bid anyway.
by Rich Feldman
Thu Aug 09, 2018 2:57 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: TDR of a neutron detector tube
Replies: 0
Views: 255

TDR of a neutron detector tube

Did anyone else ever wonder how a thin-wire detector tube would behave as a coaxial transmission line? I found out in the lab the other day. The subject was my BF3 tube that we talked about here 19 months ago. http://www.fusor.net/board/viewtopic.php?f=46&t=11254&p=74207 At very high frequencies, it...
by Rich Feldman
Thu Jul 26, 2018 11:36 pm
Forum: Announcements and Site Administration Topics
Topic: Sunnyvale Mini Meetup -- August 11
Replies: 5
Views: 606

Re: Sunnyvale Mini Meetup -- August 11

Sorry, Ian, that date won't work for me this year. Maybe September.

Am so desperate to get rid of stuff before this winter, I might set up as a seller in August.
With intent to pack up & leave (or hand it over to a partner) between 9:30 and 10 am.
by Rich Feldman
Thu Jul 26, 2018 3:13 am
Forum: New User Chat Area
Topic: Trying for Tritium
Replies: 6
Views: 306

Re: Trying for Tritium

Harry, Did you find any of the forum discussions about tritium produced by all fusors? D-D fusion creates about as many tritium nuclei as neutrons, particle-wise, IIRC. 3x as much tritium as neutrons, by mass, with no lithium required. You would deserve a medal (or at least big applause here) if you...
by Rich Feldman
Fri Jul 20, 2018 5:56 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Maximus Energy NEUTRON-PRO neutron detector
Replies: 2
Views: 797

Re: Maximus Energy NEUTRON-PRO neutron detector

I'd imagine a HV circuit that generates impulsive E-field noise will also generate impulsive H-field noise. In both cases it's a near field issue, 'cause we want the neutron detector to be right next to the fusor. Does the product under discussion include magnetic shielding, to reduce voltages induc...
by Rich Feldman
Mon Jul 16, 2018 2:27 pm
Forum: New User Chat Area
Topic: Working Diffusion Pump?
Replies: 7
Views: 470

Re: Working Diffusion Pump?

It's analogous to the water input port for a teakettle. tk.jpg Did you think the DP consumes fluid in normal operation? You can learn a lot about them from the Internet without posting questions to people. Maybe you guys can divide up the work. Browse this forum. Search this forum. Read the FAQs. Br...
by Rich Feldman
Sat Jul 14, 2018 11:49 pm
Forum: New User Chat Area
Topic: VACUUM CHAMBER
Replies: 5
Views: 415

Re: VACUUM CHAMBER

>> most glass-based devices would implode at the 5-20 micron range. Joshua, we have to interrupt before a serious misconception is propagated. How much does the implosion risk change between a 7.6 torr vacuum and a 7.6 micron vacuum? The material stresses, from exterior-interior pressure difference...