Search found 82 matches

by Cai Arcos
Sat Aug 29, 2020 7:59 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Help with HV adjustable power supplies for radiation detectors.
Replies: 38
Views: 8205

Re: Help with HV adjustable power supplies for radiation detectors.

Joe: If you use a fluorescent lamp inverter and this filter (just like Jim Williams used) the noise will be indistinguishable from background. However I wanted to add feedback as to make the supply regulated, and it always seemed to introduce noise. As of right now, and trying to learn as much as po...
by Cai Arcos
Thu Aug 27, 2020 8:57 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Help with HV adjustable power supplies for radiation detectors.
Replies: 38
Views: 8205

Re: Help with HV adjustable power supplies for radiation detectors.

This linear regulator are toys, with terrible regulation under load and tremendously easy to pop. I have finished the supply now, using a classic series regulator with a HV transistor from a CRT TV. If anyone is interested in pursuing low noise power supplies, GET A DIFFERENTIAL PROBE! I can not tel...
by Cai Arcos
Thu Aug 27, 2020 7:09 am
Forum: Fusion --- Past, Present, and Future
Topic: Successful Russian fusion neutron club entry
Replies: 2
Views: 2836

Re: Successful Russian fusion neutron club entry

Well at least there is a full photo of the builder!
by Cai Arcos
Sat Aug 15, 2020 9:47 am
Forum: Images du Jour
Topic: Quaid Hawkins - Plasma and Progress
Replies: 14
Views: 2757

Re: Quaid Hawkins - Plasma and Progress

Hi: I've read that digital potentiometers don't like to operate in very noisy areas. Besides, taking into account that a failure of this component could be fatal, I would recommend connecting a phenolic (or other insulating material) to the shaft of the original potentiometer, and then this rod to a...
by Cai Arcos
Tue Jul 28, 2020 8:55 am
Forum: Images du Jour
Topic: Carl’s Jr. gone Steampunk ?
Replies: 9
Views: 1673

Re: Carl’s Jr. gone Steampunk ?

Rich:
I don't know how I did no see the T-49 written in the base... I just saw the metal cusp and assumed it was a voltage regulator.
My bad!
by Cai Arcos
Mon Jul 27, 2020 6:04 pm
Forum: Images du Jour
Topic: Carl’s Jr. gone Steampunk ?
Replies: 9
Views: 1673

Re: Carl’s Jr. gone Steampunk ?

Do I see a voltage regulator tube sticking out of a port?
by Cai Arcos
Thu Jul 16, 2020 7:18 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: HF switcher supply construction and voltage multiplication
Replies: 38
Views: 10257

Re: HF switcher supply construction and voltage multiplication

Why all the hassle? Seems to me like you still don't have a solid understanding of the circuit you are trying to build, and simply copy pasting schematics in hv projects normally leads to broken components. You also have taken the most difficult path. Might be consider start searching for a traditio...
by Cai Arcos
Sat Jul 11, 2020 8:26 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: NEW Fusor V build under way.
Replies: 63
Views: 11515

Re: NEW Fusor V build under way.

Richard:

I remember that you calibrated your detectors using bubble dosimeters, and that they couldn't be moved afterwards in order to conserve that calibration.
Are you planning to redo the whole process or do you have something in mind?

As always, a superb effort.
by Cai Arcos
Tue Jul 07, 2020 10:43 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Help with HV adjustable power supplies for radiation detectors.
Replies: 38
Views: 8205

Re: Help with HV adjustable power supplies for radiation detectors.

After becoming tired of feedback compensation shanaenigans, poor regulation and spurious oscillations, i'm now looking to linear high voltage, maida style regulators. I've even found the fascinating LR8, a one-package, 400V, cheap, linear regulator! Wow! Is there any problems or quirks (aside from p...
by Cai Arcos
Wed Jul 01, 2020 7:15 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Help with HV adjustable power supplies for radiation detectors.
Replies: 38
Views: 8205

Re: Help with HV adjustable power supplies for radiation detectors.

After the final exams and some unexpected health issues, I'm finally able to continue working. I just got the inverters for a power supply like that demonstrated by Nathan Marshall, but before that I'm (again) revising the HV supply. More specifically, I've found a way to use the blocking oscillator...