Search found 290 matches

by Bob Reite
Tue Jan 22, 2019 1:03 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Construction of Neutron Grade Fusor
Replies: 21
Views: 548

Re: Construction of Neutron Grade Fusor

You must be getting backscatter from something. My lead shield is just 0.035 inch think, yet I can go to 55 KV without any detectable X-rays on the other side of the shield. All people still stand at least 6 feet away from my machine while it is operating. When I do in and out of moderator tests, I ...
by Bob Reite
Fri Jan 18, 2019 3:28 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Construction of Neutron Grade Fusor
Replies: 21
Views: 548

Re: Construction of Neutron Grade Fusor

Since you have a 70KV supply I would increase your ballast resistor to 2.5 megohms! Yes, that's 2,500,000 ohms. Assuming that you are drawing 8 mA, that in theory should drop only 20 KV across the resistor leaving 50 KV across the fusor, assuming that your supply does put out an honest 70 KV at 8 mA...
by Bob Reite
Wed Jan 16, 2019 2:35 pm
Forum: The Trading Post
Topic: Looking for: Controller Panel for Spellman-Bertan PMT power supply
Replies: 20
Views: 595

Re: Looking for: Controller Panel for Spellman-Bertan PMT power supply

Measure the distance between the contacts on that edge connector. Then you should be able to find a mating card edge connector at Mouser or Digikey.
by Bob Reite
Sat Jan 05, 2019 7:21 am
Forum: Announcements and Site Administration Topics
Topic: No more attachments (images) allowed!
Replies: 12
Views: 600

Re: No more attachments (images) allowed!

Can't you set a size limit on images uploaded? File size that is.
by Bob Reite
Wed Jan 02, 2019 12:15 am
Forum: Announcements and Site Administration Topics
Topic: No more attachments (images) allowed!
Replies: 12
Views: 600

Re: No more attachments (images) allowed!

I was going to suggest hosting any large photos on your own server. That's what I do for other sites that have limited upload space.
by Bob Reite
Tue Jan 01, 2019 11:27 pm
Forum: New User Chat Area
Topic: Someone give me some exact specs
Replies: 19
Views: 803

Re: Someone give me some exact specs

I failed in my effort on the Interocitor. I only got as far as getting the needed "bead condenser"
A bit off topic: Richard, where did you get that bead condenser prop? Make it yourself?
by Bob Reite
Tue Jan 01, 2019 11:14 pm
Forum: Images du Jour
Topic: Fusor Progress, Luke Harrill
Replies: 9
Views: 1676

Re: Fusor Progress, Luke Harrill

I love old electronics like that. Nostalgia of the stuff I built during my high school days. You can actually see the parts without having to use a magnifier. Needless to say, my new designs are more compact, but I still use through hole components unless the device I need is only available in SMT. ...
by Bob Reite
Mon Dec 24, 2018 3:00 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: "Blown up Sir!!" - OOPS....
Replies: 4
Views: 964

Re: "Blown up Sir!!" - OOPS....

Reminds me of the time we blew up a transmitter trying to get the 2nd harmonic down. I was prepared to leave it alone after having cured the nasty spur that was the original complaint, but it did not quite meet FCC spec. We would up sending the darned thing to the factory.
by Bob Reite
Fri Dec 21, 2018 10:42 pm
Forum: New User Chat Area
Topic: PEM electrolysis example
Replies: 3
Views: 314

Re: PEM electrolysis example

I would advise NOT using ordinary water in a cell that you plan to use for heavy water later, else your D2 will be contaminated with H2 for I don't know how long. One should also install an over/under pressure system as the membrane can be damaged, if say something goes wrong with the mass flow cont...
by Bob Reite
Sun Nov 25, 2018 9:31 pm
Forum: Advanced Technical Discussion Area
Topic: Harbor Freight freebie meters
Replies: 12
Views: 1340

Re: Harbor Freight freebie meters

I'm guessing it's because the test lead wire is so flimsy on the current batch of meters is that they had to derate them to 250 volts.