Search found 211 matches

by Jeroen Vriesman
Fri May 20, 2011 7:47 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: How to make fusion chamber?
Replies: 23
Views: 4906

Re: How to make fusion chamber?

<t>I got some big stainless steel hemispheres (about 30 cm inside) from a scrap metal dump, didn't cost much but takes a lot of work to make it into a vacuum chamber. They came from an oil storage company (vopak), originally big rotary vanes.<br/> So if you can find friends at an oil storage/refiner...
by Jeroen Vriesman
Tue Apr 26, 2011 2:04 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: nickel and hydrogen " cold fusion" ???????
Replies: 14
Views: 6226

Re: nickel and hydrogen " cold fusion" ???????

<t>When you liquefy hydrogen, after some time, it will spontaneously heat up a bit and become vapour again, even in perfect thermal isolation.<br/> This energy comes from the transition of orthohydrogen to parahydrogen (proton spin aligned or in opposite directions).<br/> An ortho-para catalyst (lot...
by Jeroen Vriesman
Thu Mar 31, 2011 7:50 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Microwave inverters
Replies: 8
Views: 4321

Re: Microwave inverters

John is right.
I meant on/off directly for the magnetron when it is operating, but I should have been more clear.
by Jeroen Vriesman
Wed Mar 30, 2011 1:55 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Microwave inverters
Replies: 8
Views: 4321

Re: Microwave inverters

<t>It's just on/off.<br/> <br/> By putting 2-3 volts on pin 3 of the DPC connector, the optocoupler turns on and power turns on.<br/> <br/> You need to connect pin 2 of the DPC connector to ground of your control circuit.<br/> <br/> If you want to use the feedback "on" signal, use a pull-up resistor...
by Jeroen Vriesman
Tue Mar 29, 2011 7:47 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: EDITED, EDITED Help MCA HPGe HV Shutdown
Replies: 5
Views: 2607

Re: EDITED, EDITED Help MCA HPGe HV Shutdown

<t>You can use the output of the opamp directly to your BNC input, it's just a matter of selecting the right polarity, the manual you posted says that the polarity is "user selectable".<br/> You have to check the input impedance of the BNC input, from the manual or by measurement, might not be a goo...
by Jeroen Vriesman
Mon Mar 28, 2011 11:01 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: EDITED, EDITED Help MCA HPGe HV Shutdown
Replies: 5
Views: 2607

Re: EDITED, EDITED Help MCA HPGe HV Shutdown

<t>correction on my previous post:<br/> <br/> --------<br/> Now, depending on the "cut traces-add wires" or not the output of the LF356 will flip from -10 to +10 V at a Rptr=1250 ohm.<br/> --------<br/> <br/> should be:<br/> <br/> Now, depending on the "cut traces-add wires" or not the output of the...
by Jeroen Vriesman
Mon Mar 28, 2011 10:01 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: EDITED, EDITED Help MCA HPGe HV Shutdown
Replies: 5
Views: 2607

Re: EDITED, EDITED Help MCA HPGe HV Shutdown

<t>Hi Jerry,<br/> <br/> First, the thermistor should be connected to pin 1, also to pin 8, but that just happens to be ground.<br/> <br/> What happens is:<br/> <br/> R1 together with the PTR (= thermistor = Positive Temp.co Resistor, that explains why pin 1 is called PTR) forms a voltage divider.<br...
by Jeroen Vriesman
Sat Mar 19, 2011 8:11 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Opinions on theoretical plasma heating
Replies: 8
Views: 2980

Re: Opinions on theoretical plasma heating

<t>I think I understand some of your posting, the first half maybe..<br/> <br/> I don't know what you mean by "using smaller amounts of fuel, delivering more energy into the system".<br/> bremstrahlung loses will be less when the grid current is less.<br/> <br/> Do you mean that you are creating a v...
by Jeroen Vriesman
Fri Mar 18, 2011 1:56 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Spherical vacuum chamber
Replies: 2
Views: 3330

Re: Spherical vacuum chamber

Didn't pay that much for it (2 euro's per kilo). I believe they were used for oil.
And most edges are exactly right for standard viton rings.
But there probably is something coming up which will take a 100 hours...
by Jeroen Vriesman
Fri Mar 18, 2011 10:12 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Spherical vacuum chamber
Replies: 2
Views: 3330

Spherical vacuum chamber

<r>Yesterday I finally had some time to get two giant spherical plugs from the dump.<br/> It will take some work to make a vacuum chamber out of it. I post it here in case anyone would want to build a cheap spherical vacuum chamber and wonders where to get the material.<br/> I will try to post as ma...