Search found 26 matches

by Cristiano_Machado
Mon Nov 11, 2019 12:18 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Help to improve fusor
Replies: 5
Views: 128

Help to improve fusor

Hello, I would like to share the latest result from our fusor and ask for some advice. Today we could get a stable run at: v: 25000 V a: 1,5 mA P: 40 mTorr time: 180 s Three bubble (the big one is a failure in the dosimeter). Before test IMG_2292.jpg After test IMG_2293.jpg IMG_2295.jpg In our first...
by Cristiano_Machado
Mon Oct 28, 2019 1:31 am
Forum: Images du Jour
Topic: Neutron Club Application - Eduardo Machado & Cristiano Machado
Replies: 7
Views: 433

Re: Neutron Club Application - Eduardo Machado & Cristiano Machado

Hello, As a father I really like to help my daughter and son to develop new knowledge and to learn by doing. My role is this process is to be a mentor, but many times I have to do the "dangerous" stuff, to guarantee their safety. The fusor was our biggest project so far and I am sure it will be an i...
by Cristiano_Machado
Mon Sep 23, 2019 11:54 pm
Forum: Vacuum Technology (& FAQs)
Topic: Turbomolecular pump troubleshooting (EXT255H with EXDC80)
Replies: 44
Views: 3426

Re: Turbomolecular pump troubleshooting (EXT255H with EXDC80)

Artem, I also have this pump and I suggested to connect pin 2 to pin 5 and 6. I agree with you that this will correct the problem.
by Cristiano_Machado
Thu Sep 19, 2019 11:57 pm
Forum: Vacuum Technology (& FAQs)
Topic: Turbomolecular pump troubleshooting (EXT255H with EXDC80)
Replies: 44
Views: 3426

Re: Turbomolecular pump troubleshooting (EXT255H with EXDC80)

I may be wrong, but it seems that you have a problem on pin 2. I am not an expert, but I believe you should connect pin 2 to pin 5 and 6 (0V).
by Cristiano_Machado
Wed Sep 18, 2019 5:36 pm
Forum: Vacuum Technology (& FAQs)
Topic: Turbomolecular pump troubleshooting (EXT255H with EXDC80)
Replies: 44
Views: 3426

Re: Turbomolecular pump troubleshooting (EXT255H with EXDC80)

Hi Arun,

Can you explain how you are wiring the driver? Are you sure you are using the right pins with the correct input?
by Cristiano_Machado
Mon Sep 16, 2019 12:24 am
Forum: Vacuum Technology (& FAQs)
Topic: Turbomolecular pump troubleshooting (EXT255H with EXDC80)
Replies: 44
Views: 3426

Re: Turbomolecular pump troubleshooting (EXT255H with EXDC80)

Hello, I have one EXT255H, but my controller is EXDC160. I found an old post about the controller and it seems that the manual you are using is for the new model. My model was an old one, and the post recommended the attached manual. It worked perfectly for my turbo and controller. I use just a 24V ...
by Cristiano_Machado
Sat Sep 14, 2019 4:55 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: My progress II
Replies: 40
Views: 11662

Re: My progress II

Hello all, I am working with Eduardo on his fusor, and since the electrical part is more critical, I am responsible for it. After many troubles to get a HV power supply we finally got a solution, we will use the precipitator HVPS. We will use the attached schematic to ground and measuring the fusor ...
by Cristiano_Machado
Tue Sep 10, 2019 1:34 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Precipitator HV Supply Hacking
Replies: 15
Views: 2794

Re: Precipitator HV Supply Hacking

Hello Mark and Rex,

I received my 30kV unit today and I was wondering what is the use of these white connectors? Can I use them to measure the voltage output? I saw your schematic and I understood it can not be used to control the voltage.


30kv hacked.jpg
by Cristiano_Machado
Sat Mar 23, 2019 10:34 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 50kV Supply
Replies: 30
Views: 13233

Re: 50kV Supply

Hello Chris, Thank you for your feedback. I will check this board with the seller. I completed the schematic, using my initial design. Now I need to figure out the value of interrupter's resistors and capacitor. I think 25 kHz and 40% duty cycle is a good start and it will not stress the unit. Pleas...
by Cristiano_Machado
Wed Mar 20, 2019 4:06 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 50kV Supply
Replies: 30
Views: 13233

Re: 50kV Supply

Hello, Finally I received my unit. Now I am working on the driver. I would appreciate your comment on my design. This is based in Joe's suggestion (http://www.loneoceans.com/labs/sstc2/), and Gao Guangyan's project. Driver 2.jpg The output will be plugged into the unit transformer. IMG_1944.jpg I am...