Search found 61 matches

by Cai Arcos
Sun Sep 13, 2020 6:33 pm
Forum: Interesting Links
Topic: 4hv
Replies: 3
Views: 173

Re: 4hv

Rich: Using gmail, the mail "4hv.org" is erroneous. It wouldn't even let me send the message in the first place. That's why I thought that there must be some appendix. A webpage that has lasted 10 years... Sites like those (obviously fusor.net included) always bring me a bit of joy, because they sho...
by Cai Arcos
Sun Sep 13, 2020 2:39 pm
Forum: Interesting Links
Topic: 4hv
Replies: 3
Views: 173

4hv

Hello: I recently found a forum called 4hv which seems to be packed to the brim with useful information. I tried registering, but I'm required to send an e-mail to "4hv.org". I thought I had to add the standard @gmail.com, but apparently such direction does not exist. I presume some people here are ...
by Cai Arcos
Wed Sep 02, 2020 6:07 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: For those frustrated by spark gaps...
Replies: 4
Views: 365

Re: For those frustrated by spark gaps...

That is a very good idea! I do wonder if you could trigger those spark gaps using a magnetic field, thus creating a cheap and easy-to-make trigatron. Furthermore, it could be triggered using high-current low-voltage pulse, and thus simple solid state circuitry. In theory, you would put a coil around...
by Cai Arcos
Sat Aug 29, 2020 5:52 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Help with HV adjustable power supplies for radiation detectors.
Replies: 38
Views: 5031

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

Well, no mater what I do, I am not able to observe a sinewave on the scope. All I see is 50hz hum and the noise of the supply. I will have to try something else EDIT: I also appear to have destroyed my last TL072, so until Monday, I'm not going to be able to do anything else EDIT EDIT: Searching in ...
by Cai Arcos
Sat Aug 29, 2020 4:53 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Help with HV adjustable power supplies for radiation detectors.
Replies: 38
Views: 5031

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

If I understood correctly, my main objective using this technique is to observe the phase shift at 0db and make sure it is high enough (between 45 or 50 degrees).
If I make my function generator float, then the transformer is unnecessary, right?
by Cai Arcos
Sat Aug 29, 2020 3:48 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Help with HV adjustable power supplies for radiation detectors.
Replies: 38
Views: 5031

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

The problem is that I dont know the characteristic function of the CCFL-Inverter and bridge-filter themselves, so planning for compensation is, well, impossible. The best I'm doing is inserting various capacitance values between the feedback and the output pin of the TL072 until the noise (which ver...
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: 5031

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: 5031

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...