Search found 270 matches

by Bob Reite
Sat May 26, 2018 10:48 pm
Forum: Announcements and Site Administration Topics
Topic: A bit more on hamfesting (buying and selling)
Replies: 3
Views: 260

Re: A bit more on hamfesting (buying and selling)

I bit the bullet a couple of years ago and bought surface mount rework equipment and learned how to use it. That's because newer broadcast gear is loaded with SMT and unlike consumer electronics, you can't just go to Wally World and buy another for a couple of hundred bucks. So I can fix the newer g...
by Bob Reite
Wed May 23, 2018 2:45 am
Forum: New User Chat Area
Topic: Inner grid size assessment
Replies: 3
Views: 162

Re: Inner grid size assessment

Oh I remember Doug Coulter finding that a grid half the diameter gave him more neutrons. Not double as I recall, but statistically significant.
by Bob Reite
Sun May 20, 2018 7:52 pm
Forum: The Trading Post
Topic: Andrew Robinson FOR SALE (17/10/15)
Replies: 3
Views: 601

Re: Andrew Robinson FOR SALE (17/10/15)

Did the meter sell? I can't read the fine print in the photo, I think it says 50 uA, but not sure. Any buyer should be aware that the proper size multiplier resistor will be needed to get this meter to indicate the voltage shown on the scales.
by Bob Reite
Sun May 20, 2018 7:34 pm
Forum: New User Chat Area
Topic: Usable Chamber?
Replies: 5
Views: 283

Re: Usable Chamber?

On the other hand, people have been reporting more neutrons per KV of input with the smaller chambers.
by Bob Reite
Sun May 20, 2018 7:31 pm
Forum: New User Chat Area
Topic: Price of Viewport
Replies: 5
Views: 155

Re: Price of Viewport

If it's brand new, go for it.
by Bob Reite
Wed May 16, 2018 11:25 pm
Forum: New User Chat Area
Topic: HV feedthroughs
Replies: 3
Views: 237

Re: HV feedthroughs

Is this for a demo fusor or a machine that will eventually do full fledged fusion? If a demo fuser, just use a spark plug. Making your own can be a bit of a challenge, but search the posts here for what people have tried.
by Bob Reite
Wed Apr 11, 2018 9:25 pm
Forum: New User Chat Area
Topic: Stainless steel pipe chamber
Replies: 39
Views: 3885

Re: Stainless steel pipe chamber

You can get three phase power in a residence if there is already three phase power going down the road. One of my amateur radio friends who is into restoring old AM Broadcast vacuum tube transmitters, had a Gates 21E that he moved frequency wise to the 160 meter amateur band. The Gates 21E requires ...
by Bob Reite
Mon Mar 26, 2018 10:48 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: HV transformer yay/nay
Replies: 3
Views: 867

Re: HV transformer yay/nay

That is also known as a "potential transformer" it's used to reduce a 2400 volt medium voltage circuit down to 120 volts so that it can be measured without having the real high voltage at the meter. The ratio between the input and output is very accurate. IMHO, not useful at all for fusor work.
by Bob Reite
Sun Mar 25, 2018 7:08 pm
Forum: New User Chat Area
Topic: Xray tansformer. Usuable or not?
Replies: 12
Views: 744

Re: Xray tansformer. Usuable or not?

It's rated 680 mA "long term". More than enough! I'd say that one could get it working on single phase by building your own + and - 300 volt DC supplies and just one of the inverter boards. The proof is left to the student as to how to PWM the inverters to get variable voltage. Another approach migh...
by Bob Reite
Fri Mar 23, 2018 10:33 pm
Forum: New User Chat Area
Topic: Xray tansformer. Usuable or not?
Replies: 12
Views: 744

Re: Xray tansformer. Usuable or not?

I thought I saw this posted with a photo of the label, but can't find it now. The frequency required is shown as "15 KHz". So yes, this would be quite usable provided that you can build a 15 KHz power oscillator to drive it with. You don't need 150 KV output however, 50 KV is more than enough to pro...