Search found 323 matches

by Rex Allers
Tue Mar 03, 2020 7:08 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Vacuum Chamber Construction
Replies: 82
Views: 27023

Re: Vacuum Chamber Construction

Re: " its leaking a decent amount of oil from the black tube out its back" That sounds unusual to me. Not sure what to make of the black tube or this leak of oil. Not something I would expect from a normal working pump. Key, I guess, is what vacuum you get at the input of the mechanical pump. Second...
by Rex Allers
Tue Mar 03, 2020 5:06 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Vacuum Chamber Construction
Replies: 82
Views: 27023

Re: Vacuum Chamber Construction

from Nickolas: "All that being said, I think I'm going to take your advice Rich and test the backing pump with my vacuum gauge first" Yes indeed. One step at a time when possible and that is a basic good one. What kind of gauge have you? If your gauge is good and on the pump input that sets the best...
by Rex Allers
Sun Mar 01, 2020 9:47 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: A semi-DIY preamplifier for radiation detectors
Replies: 28
Views: 14575

Re: A semi-DIY preamplifier for radiation detectors

Good stuff, Rich.

What is your alpha source? Is it from one of those big old smoke detectors?
If so, I've heard bad stuff about them shedding radioactive material. I'm sure you are careful but it'd be good to monitor your work area.
by Rex Allers
Sun Mar 01, 2020 9:31 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Mark III Advanced Pressure Control / Deuterium Generation from D2O / Metal Hydride Storage
Replies: 20
Views: 2009

Re: Mark III Advanced Pressure Control / Deuterium Generation from D2O / Metal Hydride Storage

Yikes! Really? I haven't been looking at prices in quite a while. The Hydrofill I bought in 2015 was about $330 which I thought was pretty steep. So about 3X in 5 years I gather. Still could be a good deal if a person with a filler would share D2 filled cartridges. I'd think around $100 per might be...
by Rex Allers
Sun Mar 01, 2020 2:05 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Mark III Advanced Pressure Control / Deuterium Generation from D2O / Metal Hydride Storage
Replies: 20
Views: 2009

Re: Mark III Advanced Pressure Control / Deuterium Generation from D2O / Metal Hydride Storage

Good to see someone looking into this D2 generation, storage, and use idea. There was some discussion about this on the forum several years back. Links to older threads: Solid state hydrogen storage experiments Nov 14, 2016 http://www.fusor.net/board/viewtopic.php?f=10&t=11147 Deuterium storage Dec ...
by Rex Allers
Tue Jan 28, 2020 5:04 pm
Forum: Items For Sale
Topic: Digital X-ray dosimeters on ebay 15keV+ sensitivity
Replies: 8
Views: 1257

Re: Digital X-ray dosimeters on ebay 15keV+ sensitivity

Andrew, thanks for the docs and info on getting them reset. I've got one of these from ebay too. I guess my unit's symptoms are the same as discussed here. Let me describe and hopefully someone will confirm we're all seeing the same things. Put a battery in and it goes through some short tests then ...
by Rex Allers
Fri Jan 24, 2020 7:54 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Precipitator HV Supply Hacking
Replies: 24
Views: 6715

Re: Precipitator HV Supply Hacking

Oops, I see you used IRS... vs original IR... Good to know that worked. As I said, I found a few chips that seemed they might work. I'd have to go look at the datasheets again to remember what the differences were. I'm no power supply design engineer but the function of these supplies seems unusual ...
by Rex Allers
Fri Jan 24, 2020 7:16 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Precipitator HV Supply Hacking
Replies: 24
Views: 6715

Re: Precipitator HV Supply Hacking

Alan, Thanks for the good words on my shared results from hacking these supplies. The two mystery chips (markings sanded off) were only mysteries for a while after the hacking began. In one of my zips for the 60 KV unit there is a file with this: ------ Two chips used on the 60 kV supply 1) 8-pin dr...
by Rex Allers
Sun Jan 19, 2020 5:18 pm
Forum: Announcements and Site Administration Topics
Topic: No Intranets and no songs??
Replies: 6
Views: 767

Re: No Intranets and no songs??

Sigh. Not sure how you arrived at those working links, Frank. The top-level pages of fusor.net have different links in the only way I found (as described earlier). Frank's working links: https://www.fusor.net/old-boards/intranets.com/index.html https://www.fusor.net/old-boards/songs.com/index.html -...
by Rex Allers
Sun Jan 19, 2020 4:41 pm
Forum: Philo T Farnsworth Archive
Topic: Is It A Farnsworth... or a Hirsch (redux)
Replies: 18
Views: 2715

Re: Is It A Farnsworth... or a Hirsch (redux)

More great sharing of your efforts to accumulate fusion attempt history. Thanks, Richard.