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Hack Chat Transcript, Part 3

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

Hacking on the edge of the danger zone

LutetiumLutetium 02/21/2019 at 16:300 Comments

Fran PiernasFeb-20 12:51 PM
that should work too, however I think that kerosene has shorter chains than mineal oil, so it's more likkely to burn than minearl oil

JarrettFeb-20 12:51 PM
kerosene does burn, yeah

guido.giunchiFeb-20 12:51 PM
How do you measure HV?

JarrettFeb-20 12:52 PM
it's one of the more commonly used EDM dialectrics though, so it's not instant death or anything

Fran PiernasFeb-20 12:52 PM
@guido.giunchi I do an indirect measurement:

Fran PiernasFeb-20 12:52 PM

https://www.youtube.com/watch?v=ZnGXrOs88dE

YOUTUBE MILLITESLA

JarrettFeb-20 12:52 PM
trying to remember why I wanted to use it instead of mineral oil (which is also used)

Fran PiernasFeb-20 12:52 PM
I know what I have at primary because I can measure it with the oscilloscope

Fran PiernasFeb-20 12:53 PM
(I have 138V) and I know then exactly the voltage on secondary because I know the turn ratio

Fran PiernasFeb-20 12:54 PM
btw that's the transformer the machine uses

Fran PiernasFeb-20 12:54 PM
around 5kV on secondary

guido.giunchiFeb-20 12:55 PM
What about DC? You can use a huge resisitive divider, but that scares me if the ground disconnects or opens

Fran PiernasFeb-20 12:55 PM
@guido.giunchi i don't trust resistive dividers when I have to measure 70 000V xD

guido.giunchiFeb-20 12:56 PM
Yeah, I was referring to that!

Fran PiernasFeb-20 12:56 PM
I use the oscilloscope to measure the low voltage part of the circuit and do some maths

Fran PiernasFeb-20 12:56 PM
Also, simulations are helpful

Fran PiernasFeb-20 12:56 PM
I used OrCAD to simulate all the circuit

vincent stuchlyFeb-20 12:56 PM
what about to measure lenght of the gab which the spark can jump? XD

Fran PiernasFeb-20 12:57 PM
@vincent stuchly you mean like this? :

Fran PiernasFeb-20 12:57 PM

Fran PiernasFeb-20 12:57 PM
Go and approach a ruler to it, if you dare

Fran PiernasFeb-20 12:57 PM
(I took that picture with the marx generator)

guido.giunchiFeb-20 12:58 PM
If I'm asking too much questions I'll stop, but I'm a curious electronics engineering student..

Why does the oil jump under HV?

Fran PiernasFeb-20 12:58 PM
(also it's my profile picture :D)

vincent stuchlyFeb-20 12:58 PM
I know :D it wasnt meant serious I am sorry

Fran PiernasFeb-20 12:58 PM
@guido.giunchi ask anything you want, I will answer like if @Dan Maloney if paying me for that

Fran PiernasFeb-20 12:59 PM
@guido.giunchi the oil gets ionized, not by the multipler, but by the air

Fran PiernasFeb-20 12:59 PM
I mean, that does not happen in the sealed box

guido.giunchiFeb-20 1:00 PM
Doesn't it move inside the box?

Fran PiernasFeb-20 1:00 PM
Yes, it moves a bit

Fran PiernasFeb-20 1:00 PM
but there is no air (almost) in there

Dan MaloneyFeb-20 1:00 PM
Looks like our time is almost up, but everyone is free to continue chatting as long as Fran wants to hang around, of course. I want to thank Fran for his time today and a really informative Hack Chat, and thanks to everyone for the great questions.

I also want to let everyone know that next week we'll be talking to Simon Jansen about "All Things Engima" - https://hackaday.io/event/163974-all-things-engima-hack-chat. Be sure to stop by.

Fran PiernasFeb-20 1:00 PM
so nothing happens

neil k. sheridanFeb-20 1:01 PM
Can we hear about the CT scanner before we finish!!

Fran PiernasFeb-20 1:01 PM
I will stay :P

Fran PiernasFeb-20 1:01 PM
Yes, I prepared some things to show

neil k. sheridanFeb-20 1:01 PM
:-)

Fran PiernasFeb-20 1:01 PM

https://www.youtube.com/watch?v=VqcW84oigto

YOUTUBE MILLITESLA

Fran PiernasFeb-20 1:01 PM
This is part of the live fluoroscopy before I did the scanner

Fran PiernasFeb-20 1:02 PM
I wanted to know if the camera could record it

guido.giunchiFeb-20 1:02 PM
The white dots are just high energy photons hitting the cmos sensor?

Fran PiernasFeb-20 1:02 PM
I then took a motor:

Fran PiernasFeb-20 1:02 PM

https://www.youtube.com/watch?v=CA2EUH2K-uI

YOUTUBE MILLITESLA

Fran PiernasFeb-20 1:03 PM
@guido.giunchi yes, it's noise by the x-rays

neil k. sheridanFeb-20 1:03 PM
ooh excellent!

Fran PiernasFeb-20 1:03 PM

https://www.youtube.com/watch?v=6ZYWHe7RwYo

YOUTUBE MILLITESLA

Fran PiernasFeb-20 1:03 PM
The camera does record a bit of noise

Fran PiernasFeb-20 1:04 PM
It even records sound noise lol

Nevermore78Feb-20 1:04 PM
I like that charger video!

Fran PiernasFeb-20 1:04 PM
This is the last video I prepared for this hackchat

Fran PiernasFeb-20 1:05 PM

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

YOUTUBE MILLITESLA

Fran PiernasFeb-20 1:05 PM
A view inside the machine

guido.giunchiFeb-20 1:06 PM
Woah!

Fran PiernasFeb-20 1:06 PM

Fran PiernasFeb-20 1:06 PM
This is how I do CT scans, to a lighter this time

Fran PiernasFeb-20 1:07 PM
btw, if you are looking to get some HV things to start doing experiments, here you have some things:

Fran PiernasFeb-20 1:07 PM

https://www.ebay.com/itm/12v-36V-ZVS-Tesla-coil-flyback-driver-Marx-generator-Jacob-ladder-ignition-coil/181862334218?epid=1384318081&hash=item2a57d6ff0a:g:z~QAAOSweW5VXJqH:rk:13:pf:0

EBAY

12v-36V ZVS Tesla coil flyback driver/Marx generator/Jacob' ladder+ignition coil 190268474092 | eBay

ZVS Tesla coil flyback driver generator/Jacob's ladder Inductive Heater ignitioN. 1 x ZVS Tesla coil flyback driver generator/Jacob's ladder Inductive Heater ignitioN. Excessive heat generated at magnetic coil. | eBay!

Read this on eBay

Fran PiernasFeb-20 1:07 PM
It's cheap and ready to use

Fran PiernasFeb-20 1:07 PM
On eBay you will also find HV diodes and capacitors like the ones I used for the machine

Fran PiernasFeb-20 1:08 PM
they are also very cheap: https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=20kv+10nf+capacitor&_sacat=0 and https://www.aliexpress.com/store/product/High-voltage-diode-2CL2FM-100MA-20KV/931572_32768102085.html?spm=a219c.12010108.1000001.8.766770d6MVP1E6&ws_ab_test=searchweb0_0%2Csearchweb201602_1_10065_10068_319_10892_317_10696_10084_453_454_10083_10618_10304_10307_10820_10821_537_10302_536_10902_10843_10059_10884_10887_321_322_10103%2Csearchweb201603_59%2CppcSwitch_0&algo_pvid=9cf00a05-b59c-447b-83cf-bb12e925f0df&algo_expid=9cf00a05-b59c-447b-83cf-bb12e925f0df-7

Fran PiernasFeb-20 1:08 PM
sorry fot the long links

Fran PiernasFeb-20 1:09 PM
Also guys, any question you have about HV or x-rays, you can ask me anytime via DM

guido.giunchiFeb-20 1:09 PM
Thank you!

neil k. sheridanFeb-20 1:09 PM
Thanks!

Glen SladeFeb-20 1:10 PM
Thanks, Fran

guido.giunchiFeb-20 1:10 PM
I'l probably reach out when I have a little bit more free time

eliocor joined  the room.Feb-20 1:10 PM

Fran PiernasFeb-20 1:10 PM
Also one last thing, don't be afraid of failing

Fran PiernasFeb-20 1:10 PM
I did 3 transformers for the machine:

Fran PiernasFeb-20 1:11 PM

Fran PiernasFeb-20 1:11 PM
The first one died in 2 seconds, the second worked pretty bad, and finally the third was good enough

Nevermore78Feb-20 1:11 PM
@Fran Piernas thanks for all the vids!

Fran PiernasFeb-20 1:11 PM
Keep in mind that there only one thing worse than seeing your device burning

Fran PiernasFeb-20 1:12 PM
And that's seeing that it does NOTHING XD

Fran PiernasFeb-20 1:12 PM
@Nevermore78 you're welcome :)

guido.giunchiFeb-20 1:12 PM
Ahahahahah happened too many times

Fran PiernasFeb-20 1:13 PM
Yeah, It also happened with the ZVS

Fran PiernasFeb-20 1:13 PM
I did two

Fran PiernasFeb-20 1:13 PM

Fran PiernasFeb-20 1:13 PM
this one never worked

Fran PiernasFeb-20 1:14 PM
very dissapointing, I was expecting at least that it exploded or someting

Fran PiernasFeb-20 1:14 PM
but nothing happened

Fran PiernasFeb-20 1:14 PM
Any last minute question guys? xD

Nevermore78Feb-20 1:17 PM
what's your next project?

Nevermore78Feb-20 1:17 PM
hint?

Fran PiernasFeb-20 1:18 PM
@Nevermore78 I'm buying the parts for a peltier based cloud chamber, I have the x.ray source, now it's time to build something to detect it

Nevermore78Feb-20 1:18 PM
Woah, that's gonna be nice!

Fran PiernasFeb-20 1:18 PM
Yes, it should be much easier to do than the x-ray machine

Fran PiernasFeb-20 1:19 PM
well I'm leaving now guys, thank you very much for the chat!

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