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Topics - Mads Barnkob

Pages: [1] 2 3 ... 5
1
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.

2
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.







3
/>
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:




4
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!


5
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 :)





6
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.


7
/>
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)


8
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.






9
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.

/>
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/

10
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?

11
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.


12
/>
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.

13
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

14
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!

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

15
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  ::)


16
As a part of Dave from eevblog gave me the opportunity to reach a larger audience through the guest videos, I hoped that I found a new owner for this camera and that it would bring something good to another electronics hobbyist. Unfortunately I did not find anyone back then, so I will give it another try. (edit: which also failed)

edit: You can have this camera for free! You only have to pay for shipping costs and be within the few rules stated further down.

/>
It is a Sony BVP-7AP Color Video Camera which is meant to be used with the CCU-355/P, this is the central control unit that would sit in a car with the satellite dish or be mounted in the mixer room of a studio.

It has nice viewfinder and properly a good shotgun microphone. It has a Fujinon 14x motorized zoom lens. It has 3 separate color sensors, hence the 3CCD brand, they sit in a optical filter for Red, Green and Blue.

It delivers a 720x576 lines PAL encoded signal, form the test output, the combined CCU output is a mix of picture, sound and internal communication on a special carrier frequency.

It has seen some water from bad storage, which never entered the electronics, but the UV filter behind the lens seems to have some glass pest and the exterior of the zoom lens and view finder has some aluminium corrosion. But it seems fully functional.

This is a heavy item (6kg) and shipping might be in the range of 60€ for Europe (even worse overseas), cost can vary from country to country, please ask for specific price if needed.

I will also include the DVR-USB converter and the dodgy software that came with it :)

The "contest" rules

0. Watch the video to get an idea of the electronics that is inside
1. Present a short description of a project that you want to use this camera for
2. Projects that will focus on digitalizing the analogue sensors for a new purpose will be considered front runners
edit: 3. I pick the winning idea on October 1st 2018
4. Show the result here on the forum

17
JavaTC 13.3: http://classictesla.com/home/javatc/

Quote
On 8/25/2018 2:48 PM, Bart Anderson wrote:

 There has been a recent update for Javatc

 Matt Lewis wrote a script or two to help him save a design to his hard
 drive and then load it.. He later shared it with me. I have now
 included that for Javatc.

 How it works:

 1) load a demo coil OR just type in your coil parameters into the
 input boxes like normal.

 2) Run Javatc to calc the form.

 3) go down near the bottom where the "Format Design As Text" and "Make
 Load? File" buttons are...

 4) click on "Make Load File" ----> this will save the load file to
 your hard drive wherever your browsers default save folder is located
 (we cannot force a Save As dialog in javascript, sorry)...

 5) now that the file is saved, you can upload it...

 6) if you want to upload that file (or any others you have saved),
 click on "Load Saved Coil" at the top right of the form.

 7) "Load Saved File" button will open a browser dialog where you can
 simply browse to the file and select it for uploading...

 8) once the file is selected and uploaded, you can run the data....

 There is no limit to what you can save and upload. It's all on the
 "client side" (your side on your hard drive)

 Of course you can rename the files that you save to whatever you
 desire and you can move them to whatever folder you desire...

 I want to thank Matt Lewis for making this happen. We got together
 Friday night and Saturday morning and now it should be working. There
 could be bugs but I think we killed most of the bugs.

 Anyway, just thought it would be good to let TCML know about that
 change... At some point I'll do the same for Javatc3D. Maybe next weekend.

 Mr. B

 /Love All, Trust Few, and Paddle Your Own Canoe/

18
Electronic circuits / Offgrid 48V solar to 24V battery setup
« on: August 15, 2018, 03:26:52 PM »
Hi All

I hope someone can guide me in the jungle of PWM/MPPT Western/Chinese solar battery chargers.

First a list of what I got

3x 250 Watt 48V solar panels
2x 750 Watt 24VDC/230VAC inverters
?x 24V Gel UPS batteries

So what I need is a 1000 Watt 48V solar system to 24 V battery charger. Having looked at ebay/amazon etc. its a jungle of missing specs, wild claims and no real good comparisons. I hope someone else can share their experience on this.

This is something in the price range that I find suitable and the user feedback there shows it can be used with a wide range of PV input voltage and battery bank voltage can be selected: https://www.amazon.com/ZHCSolar-Controller-Regulators-Temperature-Compensation/dp/B077TSVRDP/

Attached picture is from the solar panel.

19
Electronic circuits / Teardown of a Eaton PowerWare 60kVA UPS system
« on: August 09, 2018, 12:25:32 PM »
This is the teardown of a large 2x 60 kVA Eaton UPS system, first is the teardown video and below are some pictures and a little description of the components.

/>
Here is a picture of a single 60 kVA system installed with battery and inverter cabinets



I am not quite sure if this was really a 60 kVA or a 90 kVA unit, as the cabinet had both stickers on it.



The cabinets were unfortunately badly damaged from crane handling when they were thrown out into the junk yard. I managed to scavenge input rectifier, capacitor bank and 5 inverters from the system.









The inverter boards consisted of 10x FS35R12W1T4 IGBT 3-phase full-bridge modules, 6 of them used for the output and 4 of them for the intermediate / battery charge inverters.  For details of the boards see the video at the top.

The inverter boards were pure with only IGBT and DC bus capacitors, so they are suitable for hacking into something else, maybe it is just the relatively low 70 A peak current handling of the modules that limits its use for other applications. I will post more about this in a future thread :)

20
For information for those interested in seeing the live stream :)

Quote
T minus 5 days - weather is GO and launch window set.
Launch update July 23rd 2018

All systems are still go for launch of  the Nexø II rocket from ESD139 in the Baltic Sea. This afternoon we have confirmed that the weather forecast for ESD139 is within limits so we are still aiming for launch:

July 28th between 8AM and 11AM UTC

The fleet will depart from Copenhagen on Wednesday July 25th at approximately  1PM (CEST). Estimated time of arrival in Space port Nexø is Thursday July 26th at 1PM (CEST).

We will send out information regularly as the first launch window approaches. Updates will also be announced on www.copsub.com

The test will be transmitted LIVE on youtube. The livestream link will be available on mission day, and published on our website. All media are welcome to embed the link.

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