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Registered Member #1361
Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
I have a small CO2 laser tube here, and need to get a power supply for it. Its operating spec's are 13kV, 18ma. The trigger voltage is 20kV, but I am just going to use something like a bbq ignitor for that. Apparently it is a DC tube. Anyone know how I could get 13kV @ about 18ma?
Flyback would be easy, but I don't think they can source enough current ....
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
If you can find one, an old NST of 5kV-0-5kV - such as the British Tunewell type which has an easily removable centre-tap - would provide you with 14kV once it was rectified.
Older non-electronic American-made NSTs might also be suitable. There are plenty of NST enthusiasts on this site to ask!
Registered Member #538
Joined: Sun Feb 18 2007, 08:33PM
Location: Finland
Posts: 181
lpfthings wrote ...
I have a small CO2 laser tube here, and need to get a power supply for it. Its operating spec's are 13kV, 18ma. The trigger voltage is 20kV, but I am just going to use something like a bbq ignitor for that. Apparently it is a DC tube. Anyone know how I could get 13kV @ about 18ma?
Flyback would be easy, but I don't think they can source enough current ....
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
I would go with rectified NST; I have a small tube of similar specs and it works fine. As for ignition voltage, that just means it should produce 20kV open circuit, which will then drop to 13kV under load.
You really don't need to worry about tube voltage, just put a cheap ammeter in series with the tube to make sure the current stays in check. After all, Ohm's law will keep the voltage across the tube exactly where it should be, as long as current and temperature stay in operating range.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
If you can get an old and hefty AC bare-wire TV transformer, it should be able to source the current you need. Of course you need to use a rectifier, preferrably a fullwave one...
I used one in my demo Jacobs ladder, it operated approx. 500W peak for 6 hours and survived...
Edit: It is easy to wind your own if you have the core (preferrably a larger one).
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Building a power supply for a small CO2 laser tube?
