I still work with vacuum tubes. (and I can actually spell 'vacuum. One of the few words i *can* spell. Just jabbing ya)

__________________
The Temporary Relief Assistant Trailer Park Supervisor. Carmelisous Jornl :: ElecUsageCostsCalc

Oh yes, I'll get right on it! Durr my brain hurts.

I cant spell shit

What do you do with tubes ?

__________________
Michigan Medical mj vote comming up in november,sign up & vote dammitt !

LOL. me neither

They fire/control current on the plasma tubes for a CO2 laser. Some use solid state, others RF. But mine are generally DC. (-23KVDC @ 1 amp)

__________________
The Temporary Relief Assistant Trailer Park Supervisor. Carmelisous Jornl :: ElecUsageCostsCalc

Cool link. It would probably be a really cool project to build but using it in real life would be a total pain in the ass since you have to recalibrate it every time you use it, "The two other potentiometers are used for calibrating the pH meter before each use using known pH solutions."

Plus it costs about 100 euros, "You now have a tiny high-accuracy pH-meter that costs less than 100 euros." For that amount you could buy a good, self calibrating pH meter.

All that being said it does look like a fun project for someone into electronics but it's just not very practicable for everyday use. The reason it's so good for classrooms is you WANT your students to learn how to calibrate devices...

__________________
Grow 004 - 1 Bag seed: FIM, Pinch HST, LST
Grow 005 - 4 Bag Seed: FIM, Pinch HST
Grow 006 - Generic seeds: 4 White Widow, 2 Mazar/Afgan, 1 Bubblegum

in all practicalities it is a bit more of a pain in the ass than buying one but for people who like projects and like to be able to just tinker with shit it is really neat. I got a bunch of rep from this so i mean somebody had to find it useful enough to do that

__________________
Possessing information is perfectly legal...