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Registered Member #1134
Joined: Tue Nov 20 2007, 04:39PM
Location: Bonnie Scotland
Posts: 351
Not so far. I will try it with my homemade fluoroscope on Monday, hopefully the camera will have no issues focusing on that! I will upload a couple as soon as they are ready.
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Hello, I won one of these on ebay. While I wait for it to arrive, I am putting together the high voltage power supply. What would you reccommend more? High frequency flyback transformer based supply with rectification, or something such as a NST with voltage doubler (or tripler )?
Registered Member #1134
Joined: Tue Nov 20 2007, 04:39PM
Location: Bonnie Scotland
Posts: 351
I recommend a small ZVS driven flyback, and tripler, rather than "big iron" for these. The machine can be made more portable this way, plus the current requirements are very modest, so an NST seems like a waste!
For heater transformers, I used 9v AC "wall wart" transformers, that I modified to 6.3V by removing some of the windings.
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Hello, Good point about the NST, but going the ZVS route will no doubt cost much more money and be more fickle about running. On top of that, I hate messy looking proto boards when it comes to oscillators and power. (Which is what I would wind up with through protoboards) Unless someone knows of someone who makes ZVS pcbs, I might go the NST route and add a tripler+current limiting. (I dont plan to make this portable).
As for the heater, what current does it require? I have some 6.3VAC heater transformers around here somewhere capable of a few amps. Matt
Registered Member #1134
Joined: Tue Nov 20 2007, 04:39PM
Location: Bonnie Scotland
Posts: 351
The heater current is around 600mA or so.
Current limiting for a NST would be advised, since if the tube is allowed to overheat, the tube will happily draw whatever current is available, which would undoubtedly lead to the destruction of the tube.
I never use PCB`s for ZVS drivers, instead I solder the components directly to the MOSFET's. This actually looks quite neat, since there are few components in the circuit. There are photos kicking about on the forum in places, where people have done the same.
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Minifocus x-ray tubes for sale
(Which is what I would wind up with through protoboards) Unless someone knows of someone who makes ZVS pcbs, I might go the NST route and add a tripler+current limiting. (I dont plan to make this portable).