Search found 147 matches

by Silviu Tamasdan
Sat Dec 30, 2017 4:33 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Matsusada Power Supply Cable
Replies: 12
Views: 2530

Re: Matsusada Power Supply Cable

Quick idea about the HV connector, if you have or can borrow one of those endoscope-like devices (used to inspect pipes from inside and whatnot) you could take a look inside the connector and see what kind of contact it has.
by Silviu Tamasdan
Sat Dec 30, 2017 4:10 am
Forum: Images du Jour
Topic: My WIP Fusor
Replies: 1
Views: 750

Re: My WIP Fusor

This may help on the metering. It's literally the top post in the HV FAQ section. http://www.fusor.net/board/viewtopic.php?f=29&t=11602 And then there's this http://www.fusor.net/board/viewtopic.php?f=29&t=4266 Essentially, the milivolts measured across a 1ohm resistor will give you the current thro...
by Silviu Tamasdan
Tue Dec 26, 2017 9:44 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Criticize my HV supply design
Replies: 26
Views: 4157

Re: Criticize my HV supply design

Thanks; I actually ordered some G10 sheet because it's basically good old bakelite laced with fiberglass. It's 2mm thick, I hope that it's stiff enough to support the resistors. (edit) To be honest I was dreading making that coil, and put it off for some time. In the end though it wasn't so bad sinc...
by Silviu Tamasdan
Tue Dec 26, 2017 1:59 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Criticize my HV supply design
Replies: 26
Views: 4157

Re: Criticize my HV supply design

Another thing you want to have at your disposal, is a high voltage power load. I am in the fortunate position to be payed for building one for a project and to keep it afterwards. I built it just today. IMG_20171110_155852.jpg Cheers, Finn Hammer Quick question. What material do you use for the pos...
by Silviu Tamasdan
Tue Dec 26, 2017 1:41 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Criticize my HV supply design
Replies: 26
Views: 4157

Re: Criticize my HV supply design

What better thing to do on a Christmas day than sit down and make a present for myself. I made the secondary winding for my HV transformer in 2 sittings today, 2h each with a break in between. 450 turns in 18 layers of 25 turns each, 28AWG wire with 0.5mm silicone insulation; 0.1mm of mylar between ...
by Silviu Tamasdan
Sun Dec 24, 2017 9:32 pm
Forum: Images du Jour
Topic: Wait, what? Tiny fusors? Not for me!
Replies: 43
Views: 6387

Re: Wait, what? Tiny fusors? Not for me!

Well _some_ UV is bound to escape, depending on intensity and wavelength. Glass is to UV what lead is to gammas, they get attenuated but not completely absorbed. That's the problem with photons, you can never get rid of them completely.
by Silviu Tamasdan
Sat Dec 23, 2017 12:29 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Criticize my HV supply design
Replies: 26
Views: 4157

Re: Criticize my HV supply design

I asked the Russian seller about power rating. He replied that the official power rating of these resistors is 5W. So definitely my 2.2M ones wouldn't work at more than 3kV each. Your 200M should be able to take 30kV. At this point I only plan to use them for a HV divider. 3*1.5G +2*2.2M in series i...
by Silviu Tamasdan
Fri Dec 22, 2017 8:57 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Criticize my HV supply design
Replies: 26
Views: 4157

Re: Criticize my HV supply design

You can't tell how they are made, the red coat is very thick and you can't guess what's under it. You can't peek inside either because both ends are covered with metal caps. I changed the primary wire to 60x24AWG wire, will support up to 30A and increases the usable frequency to above 60kHz should I...
by Silviu Tamasdan
Fri Dec 22, 2017 5:43 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: A Bunch of Failures
Replies: 46
Views: 5998

Re: A Bunch of Failures

...and when you do get to testing the power supply, I suggest building a power load like I'm planning on in this thread: http://www.fusor.net/board/viewtopic.php?f=11&t=11985&start=10#p78361 50 of the 100kohm/10W resistors in series will allow you to test the supply at 50kV and up to 10mA. I paid le...
by Silviu Tamasdan
Fri Dec 22, 2017 1:03 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Criticize my HV supply design
Replies: 26
Views: 4157

Re: Criticize my HV supply design

Yes, they are exactly the same Russian resistors. They do screw into each other and the thread is M4 indeed. I bought them largely due to this feature. It makes it very practical to construct all sorts of dividers easily. I'm not sure of the power rating for these but the seller states that they are...