Search found 1248 matches

by John Futter
Sat Aug 01, 2020 7:15 am
Forum: Images du Jour
Topic: Caden Burkhardt-Fusor Progress
Replies: 14
Views: 955

Re: Caden Burkhardt-Fusor Progress

Rich
I didn't see that it was a high freq unit
you can get high frequency HV diodes out of dead panasonic inverter microwaves they usually blow the igbt
by John Futter
Fri Jul 31, 2020 6:58 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Feedback on HVDC schematic
Replies: 7
Views: 189

Re: Feedback on HVDC schematic

Brendan the sem tank was approx 1.5 cu feet the transformers about 4" cubed high frequency ferrite
the rest of the tank was made up of 6 transformers in series for the filament and the 20 stage full wave multiplier caps and diodes
by John Futter
Fri Jul 31, 2020 6:51 pm
Forum: Images du Jour
Topic: Caden Burkhardt-Fusor Progress
Replies: 14
Views: 955

Re: Caden Burkhardt-Fusor Progress

Caden
Please redo your diode mounts in plastic
Wood at your voltages starts to conduct and poses a serious electric shock risk
by John Futter
Wed Jul 29, 2020 7:28 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Feedback on HVDC schematic
Replies: 7
Views: 189

Re: Feedback on HVDC schematic

Brendan When I had to service my HV tank on my SEM Phillips had several pages in the manual on how to do this The tank itself was not strong enough to take a vacuum so a purpose built one was constructed out of line pipe to take the entire hv tank. Phillips said to use a two stage rotary pump and ma...
by John Futter
Tue Jul 28, 2020 7:05 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Low energy (<100eV) ion sources
Replies: 8
Views: 419

Re: Low energy (<100eV) ion sources

Robert We made nano-whiskers out of SiC to get field emission and made diodes and triodes that operated at a few tens of volts end result was around 1 volt per micron spacing some a little better at .7 volts per micron I have put the said paper reference up here many years ago https://ir.canterbury....
by John Futter
Tue Jul 28, 2020 6:50 am
Forum: Images du Jour
Topic: Fusor Update - Liam David
Replies: 10
Views: 464

Re: Fusor Update - Liam David

Liam from what i see of your failure the earthy end is far too close to your hot end extend your printed bit alot further ie x2 and put plenty of silicon stopcock grease over the outside of the cable inner to stop air gaps there allowing corona hence conduction to occur that then carbonises the poly...
by John Futter
Mon Jul 27, 2020 6:24 am
Forum: Vacuum Technology (& FAQs)
Topic: Rotary gear pump for vacuum
Replies: 5
Views: 329

Re: Rotary gear pump for vacuum

only if you want to poison a cubic mile of earth
by John Futter
Mon Jul 27, 2020 6:22 am
Forum: Images du Jour
Topic: Carl’s Jr. gone Steampunk ?
Replies: 9
Views: 386

Re: Carl’s Jr. gone Steampunk ?

Judging by the meter its producing way more neutrons now!!!!!!!
by John Futter
Sat Jul 25, 2020 6:43 am
Forum: Images du Jour
Topic: Fusor Update - Liam David
Replies: 10
Views: 464

Re: Fusor Update - Liam David

Liam
looking at your droidcam photo i see the hallmark of radiation exciting the camera plenty of white / colored pixels
remote is good when you see that amount of radiation interaction--you do not want a suntan from this process
keep up the good work
by John Futter
Fri Jul 24, 2020 5:17 am
Forum: Items wanted
Topic: CZT or CdTe detector anyone?
Replies: 1
Views: 75

Re: CZT or CdTe detector anyone?

How about following the board rules you signed up to when registering