Search found 39 matches

by Pablo Llaguno
Fri Oct 18, 2019 4:42 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: My progress II
Replies: 40
Views: 12118

Re: My progress II

Hey,
Just an idea so you make your grid as Mark said
Take a look at this approach viewtopic.php?f=6&t=2484
by Pablo Llaguno
Fri Feb 15, 2019 3:55 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: NST issues
Replies: 15
Views: 8240

Re: NST issues

Got a 100ohm 10-watt resistor (read 99.8 ohms in the DMM) and measured its voltage across like this: https://farm8.staticflickr.com/7914/33223790808_454ecac674.jpg Also, I soldered three diodes in each leg and floated the string in the air as Richard said –> no more arcing. Couldn't test voltage and...
by Pablo Llaguno
Thu Feb 14, 2019 2:39 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: NST issues
Replies: 15
Views: 8240

Re: NST issues

I am in the process of installing a current meter so I can confirm the obvious: the fusor is pulling too much current and that’s why I am getting these voltages. Dennis, I did try the single pole approach and indeed get 7.5 kV when there is only the HV divider as load, when demo fusor is operated I ...
by Pablo Llaguno
Wed Feb 13, 2019 11:05 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: NST issues
Replies: 15
Views: 8240

Re: NST issues

Denis, with your approach I could get 7.5kV just with the HV divider as the load. With the fusor, I couldn't go above 3kV. I tried silicon on the diodes (still on plywood) and the rectifier seems more stable. Still, I won't go over 8kV as arcing starts about there but for 7.5kV it seems to work fine...
by Pablo Llaguno
Wed Feb 13, 2019 8:01 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: NST issues
Replies: 15
Views: 8240

Re: NST issues

Thanks, Richard. I was asking about the variac because I didn't understand what was meant by Rich "Can you test your rectifier now with 120 or 240 volts, and see if it's still functional?[with the variac]". Rich thanks for the info, you are right! So today I removed the diodes from the PVC pipe and ...
by Pablo Llaguno
Wed Feb 13, 2019 1:29 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: NST issues
Replies: 15
Views: 8240

Re: NST issues

Hey Rich, Here is a diagram of the system (it is the Make photo translated) https://farm8.staticflickr.com/7894/47025200532_3379b66791_z.jpg In my case, I did use the center tap as the ground for the full wave rectifier (not half wave, as the picture incorrectly says) and the voltage divider. But wi...
by Pablo Llaguno
Wed Feb 13, 2019 12:07 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: NST issues
Replies: 15
Views: 8240

NST issues

So while making a high voltage divider to use with a multimeter I decided to test it with a 15kV 30mA NST. What I did is hook the divider to one of the terminals and the other end to the NST's ground – voltmeter read 0.8 volts AC, which means around 8,000V. While it isn't super accurate (it was cali...
by Pablo Llaguno
Tue Jan 22, 2019 10:24 pm
Forum: Images du Jour
Topic: Joe Gayo's Fusor - Neutron Detection Upgrade
Replies: 29
Views: 8346

Re: Joe Gayo's Fusor - Neutron Detection Upgrade

Great work Joe!

I am curious as to how you set up your vacuum and D2 system. Does your setup use any valve between the pump and chamber? If not, how do you manage to not waste so much D2?
by Pablo Llaguno
Sun Dec 30, 2018 11:14 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Our progress
Replies: 5
Views: 4139

Re: Our progress

Looks good! If I may ask, where did you get that nice air cooled diff pump? Those are hard to get nowadays :) Also, for the vacuum gauge I highly recommend the MKS 901p transducer, I have a post (and also others) on how to set it up very easily with an Arduino board and LCD/OLED display, very cool l...
by Pablo Llaguno
Tue Jul 10, 2018 2:52 am
Forum: Vacuum Technology (& FAQs)
Topic: MKS 901p
Replies: 58
Views: 28626

Re: MKS 901p

You are not the first to try to see if the transducer works by mouth sucking, a very sophisticated method indeed :D