Search found 157 matches

by Liam David
Wed Dec 07, 2016 12:20 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Don't Build This HV Feedthrough
Replies: 6
Views: 4314

Re: Don't Build This HV Feedthrough

For the smaller feedthrough, I used a 1/4" Swagelok cap with two o-rings in it since the ferrules I used are stainless steel. On the larger one I'll be building, I'll use a 3/4 Swagelok cap with teflon ferrules, which will allow me to seal against the insulator and electrically connect to the inner ...
by Liam David
Tue Dec 06, 2016 4:06 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Don't Build This HV Feedthrough
Replies: 6
Views: 4314

Don't Build This HV Feedthrough

As I was ramping up the power to my fusor the other day, my Spellman supply tripped and I heard some arcing at around 21kV. I couldn't find the source of the problem until I looked behind the lead vest I had draped over the chamber. The custom HV feedthrough I made arced through the insulator, and w...
by Liam David
Sat Dec 03, 2016 4:41 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA
Replies: 157
Views: 82051

Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

It's a 60k resistor, and operating it with vs. without the resistor seems to have very little effect.
by Liam David
Sat Dec 03, 2016 4:41 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA
Replies: 157
Views: 82051

Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

It's a 60k resistor, and operating it with vs. without the resistor seems to have very little effect.
by Liam David
Sat Dec 03, 2016 2:44 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA
Replies: 157
Views: 82051

Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

I ran the functioning power supply with my fusor today and had some problems. I could turn the voltage up to 27kV, but plasma would not establish at any voltage around 15mtorr. Turning the voltage above 27kV got plasma to establish for a fraction of a second, but the over current light came on immed...
by Liam David
Wed Nov 30, 2016 3:20 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA
Replies: 157
Views: 82051

Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

The relay does click when I plug it in. I will update this post tomorrow when I check the other components you listed.
by Liam David
Wed Nov 30, 2016 2:51 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA
Replies: 157
Views: 82051

Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

I applied 24V to the fan connector and the digital circuitry came on with a green system power light. This narrows the problem down to the converter. C149 has about 120V across it, diode CR34 is good, and the transformer T2 appears intact. Both secondary coils do have continuity between them, but I ...
by Liam David
Tue Nov 29, 2016 12:20 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA
Replies: 157
Views: 82051

Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

I replaced the blown IRFBG30 mosfet on my power supply board, but it still does not function. I checked all of the capacitors, and C149 has a slight bulge but has no continuity. Otherwise none of the components on the board appear damaged. Removing the fan revealed that there is only about 2V on the...
by Liam David
Sun Nov 20, 2016 7:26 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA
Replies: 157
Views: 82051

Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

I have found the failure point in my power supply. A IRFBG30 mosfet blew out on the top board and came right off the board in pieces. I'll be ordering a replacement and will see what happens. I hope it didn't cause a chain of failures, or vise versa. Location of the blowout http://i1186.photobucket....
by Liam David
Sat Nov 19, 2016 8:45 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA
Replies: 157
Views: 82051

Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

One of mine was also DOA, even though I can hear a humming noise emanating from somewhere. I checked both input fuses and they were fine, and power was going to the board, but nothing. The one that works came on immediately; the Ethernet connector blinked a few times, the fan came on, and the power ...