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Messages - DashApple

Pages: [1]
1
X-ray / Re: My new x-ray transformer
« on: April 25, 2020, 11:23:22 AM »
Do you have a supplier for the silicone oil ? , Currently I use transformer grade mineral oil with my X ray transformers , but think changing over may be a better solution for longer life ?


When I vacuumed my small transformer , It took around 7 days straight and I used a small vibration module to help move the trapped air , Worked really well .

After the 7 days , No more air bubbles could be seen and i stopped the vacuum , Seems to work fine currently : )

2
Transformer (Iron Core) / Re: Small 65Kv X Ray Transformer hosuing build
« on: December 18, 2019, 07:38:30 AM »
Thanks : ) ,

I have an oxford tig welder , I haven't used it much but its nice .

The transformer was from a small x ray head , they show up now and then online .

3
When I made a few ZVS drivers I always ran the gate supply from 12V and varied the voltage into the transformer primary to control the output .

Seemed to work well , though not sure how reliable it would be in the long run

4
Transformer (Iron Core) / Small 65Kv X Ray Transformer hosuing build
« on: December 14, 2019, 10:52:49 PM »
Hi All ,

Just wanted to share the small project I have worked on for a while now , my goal was to make small cases for the few x ray transformers I have so I can safely run them .

The transformer in use here is rated 230V Primary and 65Kv @ 8mA secondary .

The housing is made from  150 x 150 x 3mm aluminium box section , I tig welded a base and cut and welded the flange on the top .

Lid is made from polycarbonate , feed throughs are 16mm Diameter pure PTFE ( Teflon ) rods with a 3mm copper bar though the centre , this is then held in place to the lid with a nylon cable gland , both having a tight fit to minimize gaps  .

Transformer was vacuumed for 4 days under slight vibration in transformer grade mineral oil , The box is lined with 2mm Teflon sheet to help improve insulation between the case and wires .

Overall it turned out well : )




5
one reason for the 4 windings on a full bridge GDT is that even though the two mosfets/igbt are in phase they are not both at the same potential

One switch will be sitting near the supply voltage while the other will be at ground with respect to its source so you need windings for each to 

6
General Chat / Re: Degassing of Dielectric Oil Using High Vacuum.
« on: November 08, 2019, 10:16:14 PM »
I have ever only vacuumed a transformer under oil to remove the trapped air within the windings and not tried to degas the oil its self so not sure if this reply will be helpful

I used HV transformer mineral oil and ran it direct from the vacuum pump for 6 days

I believe there are some baby oils that are pure mineral oil without any additives ?

7
Spark Gap Tesla Coils (SGTC) / Re: What is going on hear
« on: September 27, 2019, 06:20:57 PM »
I have done both using manual PFC with high voltage transformers and it dose work within a range , as said knowing the inductance of the circuit helps in selecting a capacitor .


I have also have built a system that uses a industrial PFC controller to control 12 capacitors and will actively try and maintain a PFC , I have had good results with test trials .


On a high voltage transformer setup with inductive ballast and auto PFC i was able to hit 0.98 PFC during arcs , there are limits to this as the PF controller was never intended for this and is abit slow , but the principle is there .

8
Laboratories, Equipment and Tools / Re: The new toy
« on: September 21, 2019, 05:54:03 PM »
Are those 2 devices that look like transformers actually current-sharing inductors for the 3 variacs?

Yeah , I need to look and see how they wired them in

9
Laboratories, Equipment and Tools / Re: The new toy
« on: September 21, 2019, 04:55:44 PM »
I to haven't seen many with round brushes , I have three linear variacs used in lighting rated for 13A , two of them use one round brush in the centre  and the other with a round widnding uses 2 , I believe they are German made .


My 30A Tri stack uses British made transformers with full brush coverage and what looks to be brass coated windings ( goldish colour ) .

AlexanderHun Heres the picture , It was too good to pass so i got it : D .






10
Laboratories, Equipment and Tools / Re: The new toy
« on: September 20, 2019, 08:17:36 PM »
Very nice varices both of you : D

I too have a three variac unit , though mine is configured for 230V single phase with balancing chokes 75 A continuous 90A max


I am a fan on the linear style varias mainly , though i havent seen many past 13A

11
General Chat / Re: Small Phase change build R600a
« on: August 15, 2019, 06:23:40 PM »
Thanks : ) , There was a few issues to get through but in the end it turned out well .

Xtreme systems was and still is a very good place to go for phase change , there is a massive section full of builds and info threads , alot of what i learned was from there : ) .


Some of the cascade and auto cascades on there are crazy , I too would love to be able to do that but for now the simple single stage is where i will probably stay .

12
General Chat / Small Phase change build R600a
« on: August 05, 2019, 06:16:35 PM »
Hi All .

This was my first attempt at building a small phase change system and want to share the results

There was no real gain to be made from this on the CPU other than for the building experience : ) .
Specs are -

Secop 30AA 3cc R600a compressor
2.8m 0.8mm Capillary tube .
120mm 13W AC fan and 120x120x50mm condenser .
CPU is a i5 3470 ( around 85 - 90W Load )


The evaporator is a copper plate with 1/4" copper pipe coiled and brazed to it .  Under no load evap is -6C , Low side is 1PSI ( -10C Boiling point on R600a ) , Suction line 6" from compressor is -1 to -2 C so superheat is around 8C under no load .


Loaded 100% the temperatures are -1C to 0C evap and 18C reported by the CPU .


PCB is full coated in varnish on both side around and under the CPU socket , Then filled with silicone grease and lined around it with armaflex insulation ( still need to do some more insulating ) .


Not the best looking but i am happy with the results for a first attempt : ) .

IMG_20190805_132413 by TwirlyWhirly555, on Flickr

13
Smart Phones / Led Closeups with Mobile phone and lens .
« on: July 14, 2019, 03:00:09 PM »
Just wanted to share a few closeups I did with my mobile phone ( Nokia 7 ) and a small lens : )

Led engine LZ7 , 7 Colour led .

led by TwirlyWhirly555, on Flickr

intelligent led soultions 12 die , 12 colour led . 360 - 950nm

Untitled by TwirlyWhirly555, on Flickr

Led engine 4 die and 12 die 365nm leds ( 4 die is running at 5mA in picture ) .

IMG_20190714_134548 by TwirlyWhirly555, on Flickr

IMG_20190714_134401 by TwirlyWhirly555, on Flickr


14
General Chat / Re: Happy New Year!
« on: January 01, 2019, 10:23:27 PM »
Happy New Year : )

15
General Chat / Re: Merry Christmas and Happy New Year to everyone!
« on: December 23, 2018, 07:11:50 PM »
Merry Christmas everyone , happy new year .

16
Hey Everyone .

I'm from the Uk  , I have been interested in electronics and HV for a while now Have done a few small VTTCs and SSTCs and other bits a peices . I try and collect HV transofmers mostly .

I look foward to reading the threads on here and seeing what people do and hopfuly oneday making a small DRSSTC .

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