Search found 1303 matches

by Frank Sanns
Sat Apr 17, 2021 12:45 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: PMT/Scint. divider topology differences
Replies: 2
Views: 60

Re: PMT/Scint. divider topology differences

They are essentially equivalent circuits. The location of the capacitive coupled pulse output is the only meaningful difference. It is present on both configurations but in the case of the two lead setup, it comes after the split. Capacitors do not pass DC but they do pass a pulse. The key in both o...
by Frank Sanns
Mon Apr 12, 2021 9:19 pm
Forum: Interesting Links
Topic: Taste Test for Heavy Water
Replies: 1
Views: 157

Re: Taste Test for Heavy Water

Interestingly, I have smelled a difference between distilled water and heavy water. There is a very, very, slight smell of something like ethylene glycol or dioxane in there (a sweetish odor). Like one drop per liter. It is very faint but detectable especially if you A and B them back to back. One a...
by Frank Sanns
Sun Apr 11, 2021 2:52 am
Forum: Announcements and Site Administration Topics
Topic: Neutron Club / Recycled Fusor
Replies: 10
Views: 525

Re: Neutron Club / Recycled Fusor

The He-3 tube may not be the best choice for pulsed Fusor work. The signal coming from He-3 tube is feeble compared to that from a Boron-10 (BF3) tube. It also contributes way more to the background count. An equivalently large 1"x22" BF3 tube will only give around 2 counts per minute of background....
by Frank Sanns
Sat Apr 10, 2021 5:57 pm
Forum: Announcements and Site Administration Topics
Topic: Neutron Club / Recycled Fusor
Replies: 10
Views: 525

Re: Neutron Club / Recycled Fusor

We are not a plug n play forum. I call no joy for such scenario. This is one of the problems with 6 or 8 year olds “building” a Fusor with their parents. It has to be the individual or group of similar individuals building on their own. With that said though, it would be difficult to imagine someone...
by Frank Sanns
Sat Apr 10, 2021 1:31 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Long Lasting Bubble Detector
Replies: 6
Views: 342

Re: Long Lasting Bubble Detector

Self discovery and thinking for yourself is a thing of the past. We, as a society in the US have devolved into tearing people down for the minutia. Where even minor imperfection is cause to destroy a person's life or career. Safe zones just produce gatherings of the weak, self absorbed, blinder wear...
by Frank Sanns
Fri Apr 09, 2021 2:10 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Long Lasting Bubble Detector
Replies: 6
Views: 342

Re: Long Lasting Bubble Detector

I examined the couple of mine that failed in the several months window. I am not impressed with the design of the seal on these units. It is like a kids toy rather than a precision measuring device. For the price point, they are a scam. Sure they look nice with the knurled black knobs but it is what...
by Frank Sanns
Tue Mar 16, 2021 2:44 am
Forum: Control and Instrumentation Hardware and Software
Topic: Software to collect and display measured data.
Replies: 16
Views: 1281

Re: Software to collect and display measured data.

I guess we have come a long way from counting blocks on chart recorder paper! The early part of my career was before computers. We had to be resourceful and used chart recorders for everything. They had variable speed and gain and one of the projects I was working on used six transducers that the en...
by Frank Sanns
Sat Mar 13, 2021 9:44 pm
Forum: Announcements and Site Administration Topics
Topic: Two new forums added
Replies: 3
Views: 430

Two new forums added

As the site continues to evolve over the decades, new forums are sometimes needed. Two new ones are have been added. We now have a Primary Sources for Fusor Related Items forum in the Trading Post. This is the place to go if you are looking for specific items. I have moved relevant posts from the Fo...
by Frank Sanns
Mon Feb 01, 2021 11:09 pm
Forum: Items For Sale
Topic: Rich Feldman's store. Today's feature: beryllium sheet
Replies: 17
Views: 5081

Re: Rich Feldman's store. Today's feature: beryllium sheet

EDM under oil is the only reasonable way to work with beryllium. Grinding or sawing, even wet sawing is just dangerous. You do realize that there are always fines with the coarse. Doing it outside is not a guarantee of safety either. With the wind at your back or side, you will have vortices that wi...
by Frank Sanns
Sat Jan 23, 2021 11:45 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: A 50kV supply with 33mA drive ability
Replies: 19
Views: 3216

Re: A 50kV supply with 33mA drive ability

Finn, My wire winder was the two handed one. Early on I did use my father's small lathe but it was too powerful and I did not want to have the wire grab and pull my hand in or slice through it. The lathe was only The biggest project I every did by hand was around 4 miles of 22 gauge magnet wire on a...