Search found 464 matches

by ian_krase
Sun Sep 09, 2018 4:07 am
Forum: Images du Jour
Topic: My first plasma
Replies: 12
Views: 1892

Re: My first plasma

Not sure what you mean by an "arc from the grid to the glass" -- may need better pictures.

Your glass looks too clear for sputtering to be a big problem. Is there a hot spot?
by ian_krase
Thu Sep 06, 2018 2:38 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Capacitor blasts and automatic impedance matching
Replies: 1
Views: 371

Capacitor blasts and automatic impedance matching

I am sort of curious whether there's any practical circuit that automatically does some form of impedance matching on capacitor discharges -- can crushers, spot welders, flashlamp flashers, etc.
by ian_krase
Thu Aug 30, 2018 5:30 am
Forum: Vacuum Technology (& FAQs)
Topic: convectron 275 tube and controller
Replies: 9
Views: 1477

Re: convectron 275 tube and controller

Edge 10L -> Shield -> 1 -> Null Whiteblack Edge 11 -> Lowp -> 3 -> Tub 3 Redblack Edg 12 13 -> HighP -> 4 - > Tub1 Red Edge 14 -> Comp -> 8 -> Tub2 Greenblack Edge 15 -> Sense -> 9 -> Tub5 Green Here is the wiring table from my own attempt. The same for both analog and digital gauge controllers. The...
by ian_krase
Sun Aug 26, 2018 4:48 am
Forum: Vacuum Technology (& FAQs)
Topic: convectron 275 tube and controller
Replies: 9
Views: 1477

Re: convectron 275 tube and controller

Oh, also, if these are the controllers with the big .156 pitch edge connector on the back:


Two of the pins on this edge connector need to be connected for the controller to work.
by ian_krase
Fri Aug 24, 2018 8:04 pm
Forum: Vacuum Technology (& FAQs)
Topic: convectron 275 tube and controller
Replies: 9
Views: 1477

Re: convectron 275 tube and controller

Duniway Stockroom sells the connector but it's not in their catalog, yo need to ask for it.
by ian_krase
Mon Aug 20, 2018 12:31 am
Forum: Vacuum Technology (& FAQs)
Topic: Debugging an Inficon PKR 251 Series Gauge
Replies: 3
Views: 668

Re: Debugging an Inficon PKR 251 Series Gauge

Rotary vane pumps definitely get quiet when the pressure and gas load are small, but it's not terribly sensitive.
by ian_krase
Wed Aug 15, 2018 9:29 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: DIY hermetic feedthroughs: Has anybody done this?
Replies: 5
Views: 1062

DIY hermetic feedthroughs: Has anybody done this?

DIY feedthroughs are fairly common in Fusorland because you can make them with rubber or sometimes vacuum-epoxy seals. In the days of John Strong, wax seals were also used. However, the kinds of feedthroughs you can buy, the really hermetically sealed ones, are always either glass to metal sealed or...
by ian_krase
Mon Aug 13, 2018 7:14 pm
Forum: Advanced Technical Discussion Area
Topic: Fusor Simulation
Replies: 1
Views: 1190

Re: Fusor Simulation

I wish I could afford this software. My mass spectrometer project would be far easier.
by ian_krase
Sat Aug 11, 2018 6:58 pm
Forum: Announcements and Site Administration Topics
Topic: Sunnyvale Mini Meetup -- August 11
Replies: 5
Views: 1088

Re: Sunnyvale Mini Meetup -- August 11

Quick update: I will be about 20 minutes late.
by ian_krase
Fri Aug 10, 2018 6:09 am
Forum: New User Chat Area
Topic: Maintaining a vacuum in the absence of a pump.
Replies: 7
Views: 889

Re: Maintaining a vacuum in the absence of a pump.

Of course there are also mercury thyratrons. The biggest ones of these, called ignitrons, have a pool of mercury covering the entire bottom of the tube, which serves as an electrode that can't melt under high current because it is already molten. It seems like you could make an (obviously non-fusing...