Search found 2516 matches

by Chris Bradley
Wed Nov 05, 2014 7:10 pm
Forum: Vacuum Technology (& FAQs)
Topic: How to improve your mechanical vacuum pump
Replies: 7
Views: 3059

Re: How to improve your mechanical vacuum pump

HEAVY WATER wrote:If you have a small mechanical vacuum pump.How can you improve it?
Sell it and use the money to help replace it with something bigger?
by Chris Bradley
Sat Nov 01, 2014 1:07 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Homemade ceramic insulators
Replies: 8
Views: 5294

Re: Homemade ceramic insulators

Andrew Robinson wrote:Depending on what your purposes are...
As a general forum point, better to mention purposes at the outset than keep everyone guessing.
by Chris Bradley
Fri Oct 31, 2014 6:16 am
Forum: Interesting Links
Topic: ITER Lego Model Needs Support!
Replies: 2
Views: 7268

Re: ITER Lego Model Needs Support!

The plastic would become brittle after neutron bombardment.
Probably the wrong material for a reactor, but at least it'll mean it finally gets built.
:)
I know lego is expensive, but $30 billion.....? :D
by Chris Bradley
Sun Oct 26, 2014 6:17 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: New HF Driver Idea
Replies: 37
Views: 20512

Re: New HF Driver Idea

I have seen that there are a couple of microseconds of shoot-through every time the circuit switches, and with 120v, this might be an issue. I'll see how I can build in a delay between the switches. Why not buy an H-bridge driver that has a built-in delay, like anyone else would? (Sorry if I am not...
by Chris Bradley
Sat Oct 25, 2014 5:15 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: A new topology for building a low-cost DIY HV power supply ... 30kV/80W for $25.
Replies: 39
Views: 24103

Re: A new topology for building a low-cost DIY HV power supp

They are boxed up at the moment but in principle I could do that (if I can find them!!). What is the specification/project you are aiming for and how many do you want, where are you? These days, it might be easier to find a smaller number of higher power lighting or OBIT transformers that are also u...
by Chris Bradley
Sat Oct 25, 2014 5:11 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: New HF Driver Idea
Replies: 37
Views: 20512

Re: New HF Driver Idea

You are re-inventing what does not need re-inventing if you do not use FET drivers. Your 'NPN' transistor arrangement looks poor for a variety of reasons that you can find in most good texts on the subjects. Save your efforts and buy high current (for maximum efficiency) non-inverting (to avoid feed...
by Chris Bradley
Wed Oct 22, 2014 9:39 pm
Forum: Vacuum Technology (& FAQs)
Topic: VCR Fittings a Vacuum Line Hose
Replies: 8
Views: 3817

Re: VCR Fittings a Vacuum Line Hose

I run a metre of KF16 bellows from my 60l/s turbo, and it pumps just fine. We're not after super dooper scientific vacuums. You are more likely to find the chamber itself and plasma operations in the chamber are the limiting factors to the base pressure rather than the pressures in the foreline hose.
by Chris Bradley
Wed Oct 22, 2014 4:32 pm
Forum: Images du Jour
Topic: Dismantling the Fusor
Replies: 2
Views: 1741

Re: Dismantling the Fusor

Good stuff. Looking forward to seeing you set up again and generating results.
by Chris Bradley
Wed Oct 22, 2014 5:47 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Radio waves readings from fusion
Replies: 6
Views: 4170

Re: Radio waves readings from fusion

Let us know the result! I can't see it would tell you much, and be swamped by electrical noise, but if you are going to try then hope to see the report soon!
by Chris Bradley
Wed Oct 22, 2014 5:45 am
Forum: Vacuum Technology (& FAQs)
Topic: VCR Fittings a Vacuum Line Hose
Replies: 8
Views: 3817

Re: VCR Fittings a Vacuum Line Hose

My recommendation would be to buy yourself some hose adapters for either end, and use a length of heavy natural rubber hose to go in between, but not longer than necessary.