Author Topic: DIY X-RAY generator made of eBay parts  (Read 1791 times)

Offline PhotonLab

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DIY X-RAY generator made of eBay parts
« on: February 13, 2024, 03:54:23 PM »
Hello, this is my first post, I would like to share my experience on building a X-RAY machine based on parts bought on eBay.



The assembly I bought is an almost complete X-RAY head:

1) X-RAY tube D-045
2) Cockcroft–Walton 6 stages multiplier
3  High frequency tranformer board (no driver)

I did rewind the original transformer, becouse the primary was made to work in SMPS mode (powered my mains), to work with a ZVS driver.

The tube filament current is provided by a toroid transformer that is feeded by a very simply single transistor self-oscillating  driver. The toroid primary consists of 15 + 15 turns center tapped while the scondary is 3 turns of high voltage cable. This ensure insulation of the HV source.

An exposure timer has been added to the circuitry.

You can see the results in the attached pictures.


Any comments or questions are welcome.

Mario

Offline Luca c.

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Re: DIY X-RAY generator made of eBay parts
« Reply #1 on: February 14, 2024, 03:33:25 PM »
Hi Mario, very neat build, can you share the schematic for the filament supply circuit? also i was curious if you are able to modulate the current in the filament to control the x-ray hardness? In the past, I also tried to use galvanically insulated filament transformer to feed the glowing filament in the tube, with a small Chinese zvs module, but I found it very hard to control the filament current (and consequentially the HV current flowing in the tube) by varying the input voltage to the oscillating circuit.
Also more or less what is the power consumption of the HV system?

Offline PhotonLab

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Re: DIY X-RAY generator made of eBay parts
« Reply #2 on: February 15, 2024, 11:31:42 AM »
Hi Mario, very neat build, can you share the schematic for the filament supply circuit? also i was curious if you are able to modulate the current in the filament to control the x-ray hardness? In the past, I also tried to use galvanically insulated filament transformer to feed the glowing filament in the tube, with a small Chinese zvs module, but I found it very hard to control the filament current (and consequentially the HV current flowing in the tube) by varying the input voltage to the oscillating circuit.
Also more or less what is the power consumption of the HV system?

Hi Luca,
here's, in MarioCAD format :), the schematic of my very simple driver.


 
You can control the heater voltage varying the input voltage of the driver from about 12 to 18 Vdc. In my setup I got 3 Vac with 18 Vdc input at the driver. However I run my tube at about 2.5 Vac.
The whole system at maximum power runs on about 250 W.
Ciao
M.

Offline klugesmith

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Re: DIY X-RAY generator made of eBay parts
« Reply #3 on: February 16, 2024, 01:55:48 AM »
Nice work, Mario.  Welcome to the forum!

Here is a HV-isolated filament supply with no transformers or batteries, reported in 2010.
It's a motor-generator set with insulating drive shaft, made from a blender and a cordless drill.


First glimpse of calibration chart:
Verb Filament_voltage
----- -----
Stir 1.9
Whip 2.3
Blend 2.9
« Last Edit: February 16, 2024, 02:00:39 AM by klugesmith »

Offline PhotonLab

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Re: DIY X-RAY generator made of eBay parts
« Reply #4 on: February 16, 2024, 09:20:44 AM »
Nice work, Mario.  Welcome to the forum!

Here is a HV-isolated filament supply with no transformers or batteries, reported in 2010.
It's a motor-generator set with insulating drive shaft, made from a blender and a cordless drill.


First glimpse of calibration chart:
Verb Filament_voltage
----- -----
Stir 1.9
Whip 2.3
Blend 2.9

Lovely solution, what about a hamster powered wheel connected to an alternator? :)
https://hackaday.com/2010/10/20/rodent-based-power-generation/

Offline alan sailer

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Re: DIY X-RAY generator made of eBay parts
« Reply #5 on: February 19, 2024, 06:08:05 PM »
I like the filament supply idea. Can you share a simple block diagram of the parts?

It looks like your are using an Ebay ZVS driver to drive some sort of HV AC transformer, then into
a 12 stage voltage multiplier.

Cheers.

Offline PhotonLab

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Re: DIY X-RAY generator made of eBay parts
« Reply #6 on: February 20, 2024, 03:14:58 PM »
I like the filament supply idea. Can you share a simple block diagram of the parts?

It looks like your are using an Ebay ZVS driver to drive some sort of HV AC transformer, then into
a 12 stage voltage multiplier.

Cheers.
Hello,
your guess is correct: its a cheap ZVS (Amazon) who feed an hand made winded ETD49 ferrite core  transformer (about 6T primary, 500T secondary), the Cockcroft–Walton multiplier is a 6 stages bipolar (each stages is made by 2 diodes + 2 capacitors) , theres an exposure control based on a 555 time and a remote control that turn on the HV voltage and also trigger at the same time the Olympus camera. All analog old style stuff.
Soon I will publish update pictures of the setup and a block diagram :)
Cheers
M.


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Re: DIY X-RAY generator made of eBay parts
« Reply #6 on: February 20, 2024, 03:14:58 PM »

 


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