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Hack Chat Log transcript, Part 1

A event log for X-Rays and High Voltage Hack Chat

Hacking on the edge of the danger zone

LutetiumLutetium 02/21/2019 at 16:260 Comments

Fran PiernasFeb-20 11:50 AM
@Jan ohhh right, yes, I have some x-rayed stuff

anfractuosityFeb-20 11:51 AM
out of interest, do you use lead shielding?

JanFeb-20 11:52 AM
yeah, that's what I'd like to know as well. and a dosimeter?

anfractuosityFeb-20 11:52 AM
mm i was wondering about that too

JanFeb-20 11:53 AM
got my my complete face x-rayed a few weeks ago (teeth) and had to wear a full body lead apron

Fran PiernasFeb-20 11:53 AM
I use a Geiger counter, it's what I have right now, but I'd like to use a proportional meter

anfractuosityFeb-20 11:54 AM
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

neil k. sheridanFeb-20 11:54 AM
that's just to keep them from moving I think!

anfractuosityFeb-20 11:54 AM
ah yeah heh

JanFeb-20 11:54 AM
yeah I had to. to keep steady for imaging

Fran PiernasFeb-20 11:55 AM
before we start, I will answer any question and that includes technical ones of course

JanFeb-20 11:55 AM
@Fran Piernas just watched your youtube x-ray video. amazing

anfractuosityFeb-20 11:55 AM
linky? don't think i've seen that

Fran PiernasFeb-20 11:55 AM
@Jan thank you so much :D

Fran PiernasFeb-20 11:56 AM
@anfractuosity here you have

anfractuosityFeb-20 11:56 AM
thanks!

JanFeb-20 11:56 AM

https://youtu.be/ASnp6982ty8?t=366

YOUTUBE MILLITESLA

JanFeb-20 11:56 AM
X-ray video is so sweet. seeing the HDD move...

Fran PiernasFeb-20 11:57 AM
my favorite part, the HDD

JanFeb-20 11:57 AM
hasn't this been done to animals and humas as well in early X-ray days?

anfractuosityFeb-20 11:57 AM
ahh, so you're using phosphor screen right? (like krasnow did too?)

JanFeb-20 11:57 AM
*humans

Fran PiernasFeb-20 11:58 AM
@Jan you mean live fluoroscopy?

Fran PiernasFeb-20 11:58 AM
Yes

Fran PiernasFeb-20 11:58 AM
@anfractuosity of course, digital screens are very, VERY expensive

anfractuosityFeb-20 11:59 AM
i'm curious, if it's possible to diy them

anfractuosityFeb-20 11:59 AM
if you skip the fibre part

Dan MaloneyFeb-20 11:59 AM
As late as the 1940s, some shoe stores had fluoroscopy machines in them to show customers how well their shoes were fitting.

Dan MaloneyFeb-20 12:00 PM
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.

Dan MaloneyFeb-20 12:01 PM
Fran, can you start us off with a little about how you got interested in this area?

Fran PiernasFeb-20 12:01 PM
Yes of course

Fran PiernasFeb-20 12:01 PM
First I will introduce myself

Fran PiernasFeb-20 12:02 PM
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

Fran PiernasFeb-20 12:02 PM
Then I started building small devices, until I saw a tutorial about a TV flyback using the 2n3055 transistor

Fran PiernasFeb-20 12:03 PM
And I entered the amazing world of HV stuff

Fran PiernasFeb-20 12:04 PM
If you guys haven't questions I can start talking about some HV projects I've done X)

Dan MaloneyFeb-20 12:04 PM
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

anfractuosityFeb-20 12:05 PM
heh, how dangerous are the inside of old TVs, i'm kind of scared

anfractuosityFeb-20 12:05 PM
by the flyback things

anfractuosityFeb-20 12:05 PM
or in microwaves

Maccabees joined  the room.Feb-20 12:05 PM

Fran PiernasFeb-20 12:05 PM
TV are dangerous if it's been working recently before

Fran PiernasFeb-20 12:06 PM
But MOTs (microwave oven transformers) are the worst

JanFeb-20 12:06 PM
it's mostly still charged caps which were dangerous when opening old TVs :)

anfractuosityFeb-20 12:06 PM
is that because of the number of windings, re microwaves?

Fran PiernasFeb-20 12:06 PM
A pair of good gloves do the trick, you should be safe then

Dan MaloneyFeb-20 12:06 PM
I scared of microwaves, TBH. Old CRT TVs aren't too scary.

Fran PiernasFeb-20 12:06 PM
@anfractuosity mostly it's because the power

anfractuosityFeb-20 12:07 PM
ah, so more about the diameter of the wire maybe then?

JanFeb-20 12:07 PM
and a screwdriver to short caps. *boom* loved that!

Fran PiernasFeb-20 12:07 PM
I have a video of a MOT doing some plasma

Fran PiernasFeb-20 12:07 PM

https://www.youtube.com/watch?v=iOVhO8AXkrw

YOUTUBE MILLITESLA

anfractuosityFeb-20 12:07 PM
oooh

anfractuosityFeb-20 12:08 PM
what gas is in there?

TaiwoFeb-20 12:08 PM
Those booms gave me the Shivers

Fran PiernasFeb-20 12:08 PM
@anfractuosity just normal air at low pressure

anfractuosityFeb-20 12:08 PM
nice

Fran PiernasFeb-20 12:08 PM
It heats up quickly X)

Dan MaloneyFeb-20 12:09 PM
Is that just a glass mixing bowl?

Fran PiernasFeb-20 12:09 PM
Yes, my family and I used to eat the salad from it

anfractuosityFeb-20 12:10 PM
haha

[skaarj]Feb-20 12:10 PM
Greetingz!!

Fran PiernasFeb-20 12:10 PM
This experiment is very simple and you can get some cool photos, I have some

Dan MaloneyFeb-20 12:10 PM
Seems to work well, why not?

Fran PiernasFeb-20 12:10 PM

guido.giunchiFeb-20 12:10 PM
@Fran Piernas How did you get the knowledge and tools to do hv?

Vladimir joined  the room.Feb-20 12:10 PM

[skaarj]Feb-20 12:10 PM
wuaaaaaauuu!!!

anfractuosityFeb-20 12:10 PM
do you have to worry about radiation, like UV etc. with that?

Fran PiernasFeb-20 12:11 PM
Hi @guido.giunchi , I learned many things by doing them, with care

[skaarj]Feb-20 12:11 PM
Does the HV Oscillator work with vacuum tubes or with transistors?

Fran PiernasFeb-20 12:11 PM
@anfractuosity it may emmit UV light, but just a moment doesn't hurt

Fran PiernasFeb-20 12:12 PM
@[skaarj] what oscillator?

guido.giunchiFeb-20 12:12 PM
Can you tell us about your projects please?

Fran PiernasFeb-20 12:12 PM
I found that the plasma behaves differently if I rectify the MOT output

Fran PiernasFeb-20 12:12 PM
@guido.giunchi yes of course!

neil k. sheridanFeb-20 12:12 PM
I'm interested in the CT one!

Fran PiernasFeb-20 12:12 PM
here you can see when it's AC

Fran PiernasFeb-20 12:12 PM

Glen Slade joined  the room.Feb-20 12:12 PM

Fran PiernasFeb-20 12:13 PM
and here it's DC:

Fran PiernasFeb-20 12:13 PM

Fran PiernasFeb-20 12:13 PM
There are a lot of things you can do with a MOT, just remember that it can kill you if you touch it

anfractuosityFeb-20 12:13 PM
you could try making a plasma tweeter with it too ;)

Fran PiernasFeb-20 12:14 PM
Yes, I want to build one :D

Fran PiernasFeb-20 12:14 PM

https://www.youtube.com/watch?v=X1u2QYEjuqw

YOUTUBE MILLITESLA

Fran PiernasFeb-20 12:14 PM
this experiment was also done with a MOT

anfractuosityFeb-20 12:14 PM
ooooooh! that's awesome

anfractuosityFeb-20 12:14 PM
i really like those things

kelu124Feb-20 12:14 PM
There have been some videos on plasma firelighters, playing music on the arc ;)

Dan MaloneyFeb-20 12:14 PM
Love Lichtenbergs!

Fran PiernasFeb-20 12:15 PM
In fact, that awas a project for a subject at university

Fran PiernasFeb-20 12:15 PM
we investigated if Lichtenberg fractals are really fractals

anfractuosityFeb-20 12:15 PM
i _think_ there's something simiilar to what you've done there, with plastic isn't there?

Fran PiernasFeb-20 12:15 PM
so we burnt them and done some maths, they followed an exponential law so they were fractals

[skaarj]Feb-20 12:16 PM
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?

Fran PiernasFeb-20 12:16 PM
@[skaarj] you mean the plasma? just the MOT connected to the vacuum chamber

Fran PiernasFeb-20 12:17 PM
and a microwave oven HV diode to turn AC to DC

Fran PiernasFeb-20 12:17 PM
I do have a video about a vacuum tube

Fran PiernasFeb-20 12:17 PM

https://www.youtube.com/watch?v=J4Co97kZxA4

YOUTUBE MILLITESLA

Dan MaloneyFeb-20 12:17 PM
@Fran Piernas - so is the oscillator @[skaarj] was referring to is just the AC line frequency?

[skaarj]Feb-20 12:17 PM
microwave oven transformer pffffffff I hate USA style of making words short

Fran PiernasFeb-20 12:18 PM
@Dan Maloney yes, just the MOT connected to mains, that simple

[skaarj]Feb-20 12:18 PM
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??"

Fran PiernasFeb-20 12:18 PM
Oh I now understand

[skaarj]Feb-20 12:18 PM
nice work

Fran PiernasFeb-20 12:18 PM
my bad @[skaarj] xD

anfractuosityFeb-20 12:18 PM
MOT means a car checkup here heh

[skaarj]Feb-20 12:19 PM
oh poor rectifier tube, why did you torture it like that?

guido.giunchiFeb-20 12:19 PM
How did you do the "vacuum"? Simple oil rotary pump and a long hose to avoid arcs?

[skaarj]Feb-20 12:19 PM
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

Fran PiernasFeb-20 12:20 PM
@guido.giunchi I used a vacuum pump I bought on ebay

Fran PiernasFeb-20 12:20 PM
for 100 bucks

guido.giunchiFeb-20 12:20 PM
I think I have a new item to add on my ebay list

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