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Topics - Mads Barnkob

Pages: [1] 2 3 ... 7
1
General Chat / Corona lockdown thread, tell about your situation
« on: March 13, 2020, 09:23:40 PM »
Thurday 12th March, Denmark closed down by sending home all employees of the state that did not work in health care or vital parts. To work from home. I am one of the employees that are to work from home, so in the evening I film a daily short video about the situation very short and some electronics :)
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Friday 13th March. All borders just closed here in the evening, noone are allowed to travel unless extremely necessary. Amount of cases and hospitalisations are rising. Some first deaths are now reality :( We have cancelled everything and just stay at home with our kids. Not even friends or neighbors at visit.

2
Light, Lasers and Optics / DIY 250W LED Flood Light for High Speed Filming
« on: February 17, 2020, 10:58:17 AM »
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This is part 1 of my diy led flood light that is going to be used for high speed video filming with the FPS1000HD camera.

It is being built form 5x 50W LED COBs mounted on old Pentium4 CPU coolers.

I got no affiliation with these sellers, but it is where I bought my parts:
50W LED COB chips: https://www.ebay.co.uk/itm/50-W-Watt-LED-Chip-kaltweiss-24-40-mil-4500-Lm-6000K-kw-COB-Fluter-Flutlicht/162464897645?ssPageName=STRK%3AMEBIDX%3AIT
Reflector seller1: https://www.ebay.co.uk/itm/50W-70W-100W-120W-COB-Chip-LED-Lens-Fixed-Bracket-50mm-Reflector-Collimator/112785049513?ssPageName=STRK%3AMEBIDX%3AIT
Reflector seller2: https://www.ebay.co.uk/itm/50W-70W-100W-120W-50mm-Reflector-Collimator-COB-Chip-Fixed-Bracket-LED-Lens/263468105919?ssPageName=STRK%3AMEBIDX%3AIT

3
This is the unboxing of a Anet A8 3D prrinter that was bought for my father to experiment with. Hopefully this will give some good help to make parts for electronics as part of the diy way of life :)

Following videos, in the future, will be about upgrades to the printer and test of its printer capabilities.


4
Electronic Circuits / APC RS-1000 UPS Teardown
« on: January 29, 2020, 10:21:23 AM »
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A teardown of a APC RS-1000 UPS, a run down of the current paths in the system.

Data on the unit: https://www.apc.com/shop/us/en/products/Back-UPS-RS-1000VA/P-BR1000

5
Laboratories, Equipment and Tools / DSO138, Not Even Once
« on: January 20, 2020, 11:13:23 AM »
Before you buy a DSO138 or DSO150 from ebay, amazon, wish or aliexpress, it is important to understand what you are getting. The specifications are very loosely written and what looks good on paper is useless in practical use. Here I test the DSO138 specified at 200 kHz, but in reality it is worthless above 20 kHz.

Buying the right oscilloscope is knowing your work area limits and where it might be in the future. I recommend that you read: 12 things to consider when choosing an oscilloscope: https://www.mouser.com/pdfdocs/Tektronix12_things_to_consider1.pdf

For the Nyquist applet to play with: http://195.134.76.37/applets/AppletNyquist/Appl_Nyquist2.html


6
I do not know the seller, but some US members might be interested in some fairly priced CM300 bricks. I am sure that seller is open to offers on buying more of them :)

https://www.ebay.co.uk/itm/Mitsubishi-CM300HA-24H-H-Series-Switching-IGBT-Module-Transistor/184111758395?epid=1400334401&hash=item2addea7c3b:g:lI4AAOSwW79eBirr

7
From: https://hackaday.com/2020/01/08/commercial-circuit-simulator-goes-free/

Quote
If you are looking for simulation software, you are probably thinking LTSpice or one of the open-source simulators like Ngspice (which drives Oregano and QUCs-S), or GNUCap. However, there is a new free option after the closing of Spectrum Software last year: Micro-Cap 12. You may be thinking: why use another closed-source simulator? Well, all the simulators have particular strengths, but Micro-Cap does have very nice features and used to retail for about $4,500.

The simulator boasts a multipage schematic editor, native robust digital simulation, Monte Carlo analysis, 33,000 parts in its library, worst-case and smoke analysis, Smith charts, and it can even incorporate spreadsheets. There’s a built-in designer for active and passive filters. Have a look at the brochure and you will see this is a pretty serious piece of software. And now it’s at least free as in beer.

Download: http://www.spectrum-soft.com/download/download.shtm

8
Electronic Circuits / 10 kVA Kjellberg Plasma Cutter CUTi 31 Teardown
« on: January 03, 2020, 09:34:58 AM »
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A teardown of a Kjellberg CUTi 31 Plasma Cutter with a power rating of 10 kVA. Made for cutting in 25-30 mm steel.

Connecting voltage (V): 3x 400VAC
Connecting power (kVA) 10.4
Mains fuse, slow(A) 16
Open circuit voltage (V) 240
Cutting current (A) 20...70
Duty cycle 70A/35% or 50A/100%

9
General Chat / Happy New Year 2020
« on: December 31, 2019, 11:12:01 AM »
Happy New Year and best wishes for a wonderful 2020 to you all!

Thank you to all followers, subscribers and members www.kaizerpowerelectronics.dk and www.highvoltageforum.net


A second video, end of the year comedy/spoof! Can tradition be broken by second video on second year? :)

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Screamer fireworks with 1g, 3g and 4½g of fireworks powder. Primarily Benzene group fuels and Potassium Chlorate / Perchlorate oxidizers. All legally bought fireworks, not home made!

10
I wish for good holidays and celebrations for All. Thank you for a good 2019 that only promises a better 2020 @ HVF.

It is not yet tradition, but here is my second comedy end of the year video.

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11
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Test and Teardown of a Julabo ED heating immersion circulator from a decommissioned laboratory.

JULABO immersion circulators for controlling temperature +20 to +150 °C in any bath tank up to 50 liters. Parts that are immersed in bath liquid are constructed of stainless steel or synthetic material. Common applications include controlling the temperature of samples, temperature testing of articles, materials testing, and evaluation, adjustment, and calibration or thermometers and thermal switches.

12
This is a Aethra Colour CCD Webcam that was part of a system made for remote medical diagnose / consultation for patients in remote locations.

The system was mounted in a car to be mobile, so a driver could visit patients and make a call to the doctor do complete the consultation within the patients home. The system was driven by a embedded PC with a complete circuit for the interface, audio/video and running all peripherals on a RS232 daisy chain. The whole setup used some kind of GSM link to transfer the video and audio signal, seemed to be a very expensive and complex setup.

Mainboard computer thread: https://highvoltageforum.net/index.php?topic=647.0


14
I received this on the Tesla Coil Mailing List ( https://www.pupman.com/mailman/listinfo/tesla ) today:

Full topic: "4. Bill Wysock's scrapbook, Frederick Finch Strong's scrapbook, T. B . Kinraide Archive, H. G. Fischer Blueprints, Electrotherapy Museum Archive, Unpublished Letters/Lectures of Tesla Family (Jeff Behary)"

Message:
Tesla group:

Some recently published photos, scrapbooks, and archives.
Not an easy thing to do...but I figured having the information out there is better than it dying with me or friends, or getting scrapped (like the Tesla family archives).
If these things were found 100 years from now they'd be considered national treasures and no one would think twice to publish them.
It's harder when it's friends.  Most of this stuff was never meant to be published... but are too priceless to be lost.  Right or wrong, I'm sorry either way.
My goal is to upload 50,000 pages by the end of the year.  The last few years have been too much.

Bill Wysock's Scrapbook and Photos
621 pages:
https://archive.org/details/billwysockscrapbooks

Tesla Technology Research
160 pages
https://archive.org/stream/billwysockscrapbooks/Bill_Wysock_TTR#mode/2up

Unpublished Letters
691 pages:
https://archive.org/details/electrotherapymuseumletters

Dr. Frederick Finch Strong's Scrapbook and Archive
Part 1:  429 Pages:
https://archive.org/details/ffs1scrapbook
Part 2:  337 Pages:
https://archive.org/stream/ffs1scrapbook/FFS_2_High_Freq_Currents#mode/2up
Part 3:  104 Pages:
https://archive.org/stream/ffs1scrapbook/FFS_3_Ajax_Replicas#mode/2up

Electrical Discharges in a Vacuum
92 Pages:
https://archive.org/details/VacuumDischargeTubesLowResolution

A selection of 11x17 blueprints from H. G. Fischer Corp
1427 Pages:
https://archive.org/details/HGFischer11x17Blueprints

T. Burton Kinraide Archive
5020 Pages
https://archive.org/details/QuestForKinraide5026pgs

Electrotherapy Museum Booklets:  1996-2003
4390 Pages
https://archive.org/details/electrotherapymuseum19962003

Jeff Behary,
or what remains of him.

15
The HP T-620 Thin Client is a powerful little machine, that with ease can be hacked into using a random 19VDC PSU and run Windows as any normal PC, easy and cheap PC!

This thin client was thrown out, without anything else than the box itself, no power supplies, no nothing.

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The port and connector layout from the manual shows that the HP T-620 models needs a 19VDC power supply. A little searching showed that it was not as simple as just supplying it with 19VDC. HP has put in a few tricks to make a "smart laptop charger" so that you can only use their chargers.



The "smart laptop charger" restriction can be bypassed with a simple current limiting hack as per this little schematics.



All credits for this hack goes to:  http://nerdipedia.com/wiki/tiki-index.php?page=Smart+laptop+charger

The machine itself is powerful enough to put a little work into modding it into a PC, running Linux or Windows off a USB disk or for some models, you can even find a spare SSD slot on the motherboard, unlucky for me, this model does not have that option.


16
Hobby Sites / Tesla Coil Image Albums Worth Sharing
« on: November 01, 2019, 10:04:32 PM »
There is a lot of coilers that never got around to document their projects, but still took a lot of pictures. Here is a list of my favorites, please reply with more if you have!


Eric Goodchild: https://www.flickr.com/photos/40804581@N04/
Gao Guangyan / Loneoceans: https://www.flickr.com/photos/loneoceans/
Hvman: https://www.flickr.com/photos/hvman/
Megavoltmeister: https://www.flickr.com/people/38438611@N02/
Phillip Slawinski: https://www.flickr.com/photos/pslawinski/with/4308016178/
Roy Piepers: https://www.flickr.com/photos/roypiepers/albums
Steve Ward / Kickermagnet: https://www.flickr.com/photos/kickermagnet/
Steven Canton: https://www.flickr.com/photos/stevencaton/albums
Weston Braun: https://www.flickr.com/photos/63341195@N08/albums/72157678478822788

17
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Three-phase string inverter, 20000Wac, 2 MPPT, 4 DC inputs for each MPPT, RS485 communication interface, IP65 (NEMA4x) environmental protection degree, integrated DC and AC disconnect switch, DC and AC surge arrester (type 2), string fuses (4+4 on each MPPT) and single string current monitoring

Full details: https://new.abb.com/products/6AGC002904/trio-20-0-tl-outd-s2x-400-inverter

18
Beginners / Analog Panel Meter Shunt Calculation and Custom Scale Design
« on: October 16, 2019, 07:56:20 AM »
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I needed a 50A current meter for the 1800W induction heater ( https://highvoltageforum.net/index.php?topic=530.0 ), but had none with the proper scaling. I do however have a large box of 1mA blank scale meters, so I decided to do a video on the following topics:

- Learn how to calculate the shunt resistor for your analog panel meter
- Guesstimate the internal resistance of a unknown meter
- Design custom scales if you have a blank meter or want to use a meter for another purpose than its original.

Link to scale-o-matic: http://stiftsbogtrykkeriet.dk/~mcs/Scale.html
Link to Meter from Tonne software: http://www.tonnesoftware.com/meter.html

19
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I visited HI Tech & Industry Scandinavia 2019 in Herning, Denmark and while doing so I recorded clips of the most interesting robots, robotics, machines, vision, PLC and machine technology.

You can find booth exhibitions from Schneider Electric, Beckhoff, Flir, MakerBot, Wago, Rhode&Schwartz, Coherent and so on.

20
Electronic Circuits / 50KVA generator on a 4 cylinder Dorman diesel engine
« on: September 26, 2019, 09:44:26 AM »
I came by a small emergency generator that has been in service and still is, for a atleast 50-60 years.

The generator itself is a Titan København 50 KVA 3 phase 380 VAC, 76 Ampere and the diesel engine is a British Dorman 4LBIII 4 cylinder engine, which was also used in large excavators at the time.

The control panel was upgraded once, from a purely mechanical control, to a phase lock controller, which is still pretty old by todays standards.


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