Search found 124 matches

by AllenWallace
Fri Jan 29, 2010 1:56 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Some Ideas on D2 Purification, for D2O to D Production Methods
Replies: 16
Views: 6161

Re: Some Ideas on D2 Purification, for D2O to D Production Methods

<r>What about using HDPE or LDPE (polythene) as a hydrogen purifier? Just put D2 + D20 vapor in one side, and pull a vacuum of the other side. The D2 should diffuse across the polythene leaving the D20 behind. I would hope that the draw could feed a fusor.<br/> <br/> Perhaps a coaxial arrangement wi...
by AllenWallace
Mon Dec 07, 2009 5:28 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: GM tube with two electrodes?
Replies: 5
Views: 2022

GM tube with two electrodes?

<t>I have a couple of pancake GM tubes salvaged from an air monitor which have an unusual electrode arrangement. I'd like to understand what going on, so I can devise a circuit which will adapt the 2 BNC system to a single BNC system. <br/> <br/> I figure the HV BNC supplied the HV and the standard ...
by AllenWallace
Sun Oct 18, 2009 3:49 pm
Forum: Vacuum Technology (& FAQs)
Topic: destructive vacuum metal vapor arcs
Replies: 3
Views: 1708

destructive vacuum metal vapor arcs

<r>I'm helping a kid with his Tin Whiskers science fair project, and part of this is replicating the scenario where a spacecraft fuse blows and rather than the fuse melting, an metal vapor arc occurs which either destroys the fuse or caused a higher rated failsafe fuse to blow.<br/> <br/> The questi...
by AllenWallace
Mon Jul 13, 2009 1:54 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: oh the joys of craigslist/the NST jackpot/lookie what I got!!
Replies: 6
Views: 3231

Re: oh the joys of craigslist/the NST jackpot/lookie what I got!!

<t>I don't totally agree that NST are only usable for demo fusors. I have often speculated that if you had enough NST in parallel, the combined current would be useful for a neutron generation. <br/> <br/> I'd connect each transformer using a full wave rectifier (two diodes scavenged from discarded ...
by AllenWallace
Tue Jun 09, 2009 12:47 am
Forum: Vacuum Technology (& FAQs)
Topic: Help needed!
Replies: 2
Views: 1600

Re: Help needed!

The standard TC gauge uses 1/8 inch NPT threads. This is easy to drill and tap. Teflon tape is used when threading the TC gauge.
by AllenWallace
Sat Feb 07, 2009 10:01 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: A few noob questions
Replies: 5
Views: 2110

Re: A few noob questions

<t>> pressure cooker? <br/> Look for an aluminum cooker with the thickest metal walls. I'm thinking that older cookers may be better. Others can eaily argue that SS (Stainless Steel) is better, there are pros and cons. Steel is easier welded or brazed. <br/> <br/> One thing to watch for: the pressur...
by AllenWallace
Sat Feb 07, 2009 9:41 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Interesting Schematic in Nuts and Volts.
Replies: 40
Views: 8086

Re: Interesting Schematic in Nuts and Volts.

How does one download the high rez schematic? I can only get a low rez copy.
by AllenWallace
Wed Jun 25, 2008 12:19 am
Forum: Vacuum Technology (& FAQs)
Topic: D2 and turbo pumps?
Replies: 3
Views: 1879

D2 and turbo pumps?

<r>While reading <URL url="http://www.talk-polywell.org/bb/viewtopic.php?t=326">http://www.talk-polywell.org/bb/viewtopic.php?t=326</URL> which is about the collage fusor, I saw a note by MSimon: <br/> <br/> "There is also the compression ratio problem. Turbo pumps have a compression ratio for H2 on...
by AllenWallace
Sat Jun 07, 2008 11:45 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: mca tests- it looks to me like noise and... lets say... something?
Replies: 15
Views: 3801

Re: mca tests- it looks to me like noise and... lets say... something?

For initial testing, use a AM-241 source. It's clean. Uranium ore has numerous peaks and it's quite a mess.
by AllenWallace
Tue Apr 22, 2008 2:05 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Current and Voltage Metering for a HV Supply
Replies: 25
Views: 8105

Re: Current and Voltage Metering for a HV Supply

<t>I strongly agree using a Transzorb and a current shunt. This keeps the high voltage away from the meters!<br/> <br/> Please ask yourself, what is the worst thing which can happen if any one component shorts out or opens up (bad connection).<br/> <br/> In your original schematic, several faults wo...