@Jan ohhh right, yes, I have some x-rayed stuff
out of interest, do you use lead shielding?
yeah, that's what I'd like to know as well. and a dosimeter?
mm i was wondering about that too
got my my complete face x-rayed a few weeks ago (teeth) and had to wear a full body lead apron
I use a Geiger counter, it's what I have right now, but I'd like to use a proportional meter
heh i've had my teeth x-rayed, i had to bite something that was very uncomfortable, not sure why, but don't think i had an apron
that's just to keep them from moving I think!
ah yeah heh
yeah I had to. to keep steady for imaging
before we start, I will answer any question and that includes technical ones of course
@Fran Piernas just watched your youtube x-ray video. amazing
linky? don't think i've seen that
@Jan thank you so much :D
@anfractuosity here you have
X-ray video is so sweet. seeing the HDD move...
my favorite part, the HDD
hasn't this been done to animals and humas as well in early X-ray days?
ahh, so you're using phosphor screen right? (like krasnow did too?)
@Jan you mean live fluoroscopy?
@anfractuosity of course, digital screens are very, VERY expensive
i'm curious, if it's possible to diy them
if you skip the fibre part
As late as the 1940s, some shoe stores had fluoroscopy machines in them to show customers how well their shoes were fitting.
OK, folks, good turnout already and a good crowd in the chat. Let's kick it off with Fran Piernas talking about X-rays and high-voltage stuff.
Fran, can you start us off with a little about how you got interested in this area?
Yes of course
First I will introduce myself
Hello everyone, my name is Francisco "Fran" Piernas, I'm a 23 years old physics student at University of Granada in Spain. When I was a kid, I was that kind of kid that disassembled his toys to see what they had inside. I loved to disassemble anything. Sometimes my dad gave me a broken printer for me to disassemble it, and I was the happiest kid ever lol
Then I started building small devices, until I saw a tutorial about a TV flyback using the 2n3055 transistor
And I entered the amazing world of HV stuff
If you guys haven't questions I can start talking about some HV projects I've done X)
Cool, so much to be learned from taking stuff apart. I was always warned not to take TVs apart because of dangerous voltages. I ignored them, lol
heh, how dangerous are the inside of old TVs, i'm kind of scared
by the flyback things
or in microwaves
TV are dangerous if it's been working recently before
But MOTs (microwave oven transformers) are the worst
it's mostly still charged caps which were dangerous when opening old TVs :)
is that because of the number of windings, re microwaves?
A pair of good gloves do the trick, you should be safe then
I scared of microwaves, TBH. Old CRT TVs aren't too scary.
@anfractuosity mostly it's because the power
ah, so more about the diameter of the wire maybe then?
and a screwdriver to short caps. *boom* loved that!
I have a video of a MOT doing some plasma
what gas is in there?
Those booms gave me the Shivers
@anfractuosity just normal air at low pressure
It heats up quickly X)
Is that just a glass mixing bowl?
Yes, my family and I used to eat the salad from it
This experiment is very simple and you can get some cool photos, I have some
Seems to work well, why not?
@Fran Piernas How did you get the knowledge and tools to do hv?
do you have to worry about radiation, like UV etc. with that?
@guido.giunchi , I learned many things by doing them, with careHi
Does the HV Oscillator work with vacuum tubes or with transistors?
@anfractuosity it may emmit UV light, but just a moment doesn't hurt
@[skaarj] what oscillator?
Can you tell us about your projects please?
I found that the plasma behaves differently if I rectify the MOT output
@guido.giunchi yes of course!
I'm interested in the CT one!
here you can see when it's AC
and here it's DC:
There are a lot of things you can do with a MOT, just remember that it can kill you if you touch it
you could try making a plasma tweeter with it too ;)
Yes, I want to build one :D
this experiment was also done with a MOT
ooooooh! that's awesome
i really like those things
There have been some videos on plasma firelighters, playing music on the arc ;)
In fact, that awas a project for a subject at university
we investigated if Lichtenberg fractals are really fractals
i _think_ there's something simiilar to what you've done there, with plastic isn't there?
so we burnt them and done some maths, they followed an exponential law so they were fractals
Again I am asking the same question: for the project in that picture with the glass dome - is the HV circuit based on transistors or on vacuum tubes?
@[skaarj] you mean the plasma? just the MOT connected to the vacuum chamber
and a microwave oven HV diode to turn AC to DC
I do have a video about a vacuum tube
microwave oven transformer pffffffff I hate USA style of making words short
@Dan Maloney yes, just the MOT connected to mains, that simple
I thought it was some kind of vacuum tube oscillator and when I saw "MOT" I was wondering "what the hell kind of a MOTor is he using??"
Oh I now understand
@[skaarj] xDmy bad
MOT means a car checkup here heh
oh poor rectifier tube, why did you torture it like that?
How did you do the "vacuum"? Simple oil rotary pump and a long hose to avoid arcs?
nope... in every heavy industrial schematic involving high security and possible risk of lives - such as methan gas processing stations, petroleum drilling sites - MOT is electric motor
@guido.giunchi I used a vacuum pump I bought on ebay
for 100 bucks
I think I have a new item to add on my ebay list