Help with high volt transistor

RE: Help with high volt transistor

jw0752 — Thu, 26 Feb 2015 19:10:19 GMT

Hi Eddy, There are 2 things to control with respect to x-ray tubes. The high voltage will control the energy of the x-rays that are produced. Higher voltage produces a shorter wave length higher energy x-ray. The current to the x-ray tube's filament will control the mA of the x-ray tube and density (brightness) of the x-ray beam. All of the commercial x-rays I have ever seen control the kVp with a variac or other control of the lower voltage that generates the high voltage. The mA control is always on the current that heats the x-ray tube's heater for the cathode. More heat = more free electrons.

Note: This type of project can be dangerous electrically and also from exposure to harmful radiation. If you need x-rays for a real reason it might be better to use an old x-ray head that has the proper shielding and collimation. Statistically exposure to x-rays increases your chance of developing cancer.

John

RE: Help with high volt transistor

michaelkellett — Thu, 26 Feb 2015 09:50:16 GMT

Some time ago

Linas Karpavicius

posted an article about building a power supply for an X-Ray machine on E14.

I suggest you read it because it gives you some insights about working with high voltages.

Just search for X-Ray on E14

RE: Help with high volt transistor

Capper — Wed, 25 Feb 2015 22:51:27 GMT

I have an extra hydrogen Thyratron I'll sell you.

RE: Help with high volt transistor

gilshultz — Wed, 25 Feb 2015 19:57:23 GMT

Look at a crossatron Switch as a possible solution. Why not consider switching the lower voltage primary, if you are at mains voltage the price gets very reasonable.