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Topics - Mads Barnkob

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1
Beginners / Teach your kids electronics
« on: April 17, 2019, 11:51:59 AM »
I could write a long motivational letter about the importance of teaching on electronics with all its basic trades of logical thinking and scientific methods, but instead I will leave you with the happy face of a 5 year old that completes her first little project :)


2
Electronic circuits / Teardown of a GE LP-33 10kVA UPS system
« on: March 31, 2019, 10:32:18 PM »
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A teardown of a General Electric LP-33 10 kVA UPS, a run down of the current paths in the system and I show which parts I brought home with me.

Datasheet on the unit: https://apps.geindustrial.com/publibrary/checkout/GEA-D1026?TNR=Data%20Sheets%7CGEA-D1026%7CPDF&filename=LP%2033%20-%2010-120kVA%20-%20CE%20Listed%20-%20Customer%20Data%20Sheet%20-%20GEA-D1026.pdf

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All MIDI files played can be found in this thread: https://highvoltageforum.net/index.php?topic=118.0

DRSSTC1 information: http://kaizerpowerelectronics.dk/tesla-coils/kaizer-drsstc-i/ which I will soon update with the rebuilded bridge

Popcorn
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Star Wars - Imperial Death March
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Dave Brubeck - Take Five

5
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Schematic and pictures: http://kaizerpowerelectronics.dk/tesla-coils/kaizer-drsstc-i/

My first DRSSTC had a unfortunate and not-so-dramatic failure. I suspect in-adequate grounding from the coils grounding bar to ground to be the culprit, I will know more once I take the old bridge apart.

Silent death during a MIDI playback, once power is turned back on, the bridge short circuits and burns outs. I quickly changed it to a SKM200GB123 inverter bridge that I had around, built for another experimental project, hence why its a little crude.

It took 3-4 evenings/nights to locate all the faults, replace parts and get it running again. I am happy.

Can you guess the song that was played?


6
DSLR / Video gear & workflow: Canon 5D mk3, Rødelink, FPS1000HD and more
« on: February 12, 2019, 08:51:43 AM »
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A walk-through and demonstration of all my video and audio equipment that I use for youtube videos.

7
Voltage Multipliers / Russian Marx generator test center torn down
« on: February 06, 2019, 08:45:25 PM »
This is a sad occasion to look at a huge Marx generator in Russia that has been torn down to make space for a shopping centre. Luckily a few Russian high voltage enthusiasts managed to save as many toroids and capacitors as they could drag away in a large trailer.

First post will be the before pictures and the second the after pictures.







8
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I made this video about AC vs. DC fuses and why current limiting fuses is awesome!

High Voltage Fuse Teardown video: https://www.youtube.com/watch?v=XoW5iqfq4tA
Semiconductor Fuse Applications Guide: https://ep-us.mersen.com/fileadmin/catalog/Literature/Brochures/BR-Semiconductor-Fuse-Applications-Guide-Brochure.pdf

Littlefuse 300A 32VDC fuse destructive test:



Protistor 200A 690VAC fuse (naked) destructive test:



Protistor 200A 690VAC fuse (housed) destructive test:




9
General chatting / Merry Christmas and Happy New Year to everyone!
« on: December 23, 2018, 09:54:27 AM »
I would like to say Merry Christmas and Happy New Year to all that celebrates and for the rest, have a great holiday if that is what you enjoy at this time of year :)

It has been a wonderful year on HVF and I am happy about the community quality and slow growing progress that makes us all able to know each other and the projects.

I recorded a small Christmas/New Year greetings video for my own youtube channel.

I wish you all the best for 2019!


10
X-ray / Siemens Polyphos 30 xray machine
« on: December 19, 2018, 08:35:32 PM »
I got hold of this decommissioned xray machine, which also has quite a few years on its back. All cables cut, missing most of the mechanical parts and motors for adjusting head/table. Missing remote control and possible some external power supplies.

What surprised me the most was the wire-wrapped backplane!

I will do a video walk-through of the system once I know some more about it, hopefully I can find a manual, but it does not seem like it floats all over the internet for that model.

Enjoy :)





11
The RRU3928 is an outdoor remote radio unit. It processes baseband and RF signal data. With the Software Defined Radio (SDR)technology, the RRU3928 supports the dual-mode operation of any two modes of GSM, UMTS, and LTE through software configuration modification. RRU3928 has a dual-transmitter and dual-receiver structure, which supports higher output power and carrier capacity.

It can f.ex. do 6x GSM carriers at each 10 Watt and 1x LTE carrier at 2x10 Watt or 4x GSM carrier at each 10 Watt and 2x UMTS carriers at 2x20 Watt.

This is the initial teardown and later on I will release part 2 which is the circuit analysis video.


12
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Teardown of a Nokia Siemens Networks Flexi BTS base station. This have been in service as a 6 antenna GSM system for mobile telecommunications.

GSM/EDGE, WCDMA/HSPA and LTE capable. 2x40 Watt output power.

also a picture of me pointing at where a remote radio unit or base station amplifier is usually mounted. Technically seen this is a TMA (tower mounted amplifier)


13
These are industrial building sized rain gutter holders, but also seems to make a perfect base for construction of a ringed toroid topload.

They will make a good ringed toroid with a major diameter of 100 cm and a minor diameter of 15 cm.

They could be bent a little more into shape to get a more complete circle or get a smaller minor diameter if wanted. They do also need to be "adjusted" just a bit to be straight if mounted in a star formation as shown.

Price for 6 arms: 20$ + world wide shipping 18$

There is a total of 8 sets of 6 arms for sale, they are first offered here on HVF, then later on ebay at a slightly higher price to counter their % of the cut.






14
Electronic circuits / Eaton PowerWare 20 kVA UPS teardown
« on: October 16, 2018, 08:19:50 AM »
Here is a little quick, dirty and early morning junk yard teardown of a 20 kVA Eaton PowerWare UPS system.

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I have earlier taken some of these systems apart and you can see the differences from there photo galleries:
http://kaizerpowerelectronics.dk/tools/file-archive/?drawer=images*junk_yard_stuff*2016_03_22_-_Eaton_Powerware_20kVA_UPS
http://kaizerpowerelectronics.dk/tools/file-archive/?drawer=images*junk_yard_stuff*2016_03_22_-_Eaton_Powerware_30kVA_UPS
http://kaizerpowerelectronics.dk/tools/file-archive/?drawer=images*junk_yard_stuff*2016_09_23_-_Eaton_Powerware_20kVA_UPS

Other UPS teardown videos:
http://kaizerpowerelectronics.dk/teardown/teardown-of-a-eaton-powerware-60kva-ups-system/
http://kaizerpowerelectronics.dk/teardown/teardown-video-of-eaton-powerware-30-kva-ups/
http://kaizerpowerelectronics.dk/electronics/teardown-eaton-powerware-30-kva-ups/
http://kaizerpowerelectronics.dk/teardown/teardown-of-a-merlin-gerin-pulsar-esv-22-ups/

15
obvious click-bait head line, but I got no plans... so what to call to it :)

I got these inverter boards from a large 60 kVA UPS system where each cabinet had 4 of these modules inside.

It consisted of 10 FS35R12 IGBT bricks, which is a 3 phased full bridge module, but here they used 2 of these modules for a halfbridge where all 3 "halfbridges" inside the module was used in parallel.

There is a common DC bus supply for the 3 phases, the other 2 halfbridge inverters was either PFC or intermediate inverters, so I removed those and I now have a board with 3 halfbridges that consists of 3 parallel halfbridges.

So if I parallel these 3 outputs I would have 9 parallel halfbridges where each igbt die is rated for 70 Apeak, which is a little low, but with the huge thermal mass that 9 parallel bridges gives, this could properly be pushed above 100A without too much trouble.

At these low peak currents I think there is only one plan for these boards, a QCWDRSSTC. I could try even longer than normal on-times due to the low peak current or as I have 5 of these boards and extra IGBT modules, I could run 2 or more interleaved to allow more time for cooling.



Anyone got comments or suggestions to this plan?

16
Transformer (iron core) / GE AMX-II, mobile 110kV X-RAY system teardown
« on: October 01, 2018, 03:50:04 PM »
Teardown of SCR inverter controller, driver and bridge for a General Electric mobile x-ray unit, the AMX-II. Features a 120V battery operated apparatus from 1979 which has a 60 Hz mains inverter and 500 Hz high voltage inverter. All analog controlled with completely custom made electronics.


17
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The Hameg 8122 is a programable universal counter / timer that has 3 inputs. Channel A and B from DC-150 MHz at 300 Vp-p and channel C from DC-1.6 GHz at 5 Vp-p.

I accidentally broke a knob off the instrument when moving and while I wanted to repair it, I might as well give a teardown of the unit. Finding a replacement part was not easy, but a cheap alternative solution was found.

18
This is not my listing, but wanted to tell our US users about fair priced bricks being available. There is currently 19 for sale.

https://www.ebay.co.uk/itm/113265157138?ul_noapp=true

19
Dual Resonant Solid State Tesla coils / 4x QCW coils playing MIDI
« on: September 21, 2018, 10:05:30 AM »
I saw this shared on facebook and it comes from a unknown Russian builder that has quite a lot of videos on his channel, but very little subscribers, definitely worth checking out!

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This should be a teaser good enough for everyone to straight away build multiply QCWs and replicate that awesome show :)

20
General chatting / Garden flag pole hit by lightning
« on: September 13, 2018, 02:35:00 PM »
This is a picture of a flag pole from a neighbor of my parents.

Lightning struck the flag pole approximately 200 meters from my parents house, yet their RCD on the mains supply was knocked out, but not soon enough to save some electronics. Their router died and a few other small electronics, but not bigger stuff like washer, fridge etc. It was only equipment that was on the network that suffered, so it might have been a transient injected in the network and not the mains that killed the equipment.

Sorry for the picture-in-picture, but that is how some people get a image from one device to another  ::)


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