EEVblog Electronics Community Forum

EEVblog => Other Blogs => Topic started by: madsbarnkob on April 03, 2017, 07:56:02 am

Title: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on April 03, 2017, 07:56:02 am
Hello All

Just wanted to tell you a little about my high voltage, Tesla coil and general electronics website. 8 years of projects and data :)

It contains schematics, pictures, instructions and videos of 10 Tesla coils of different topologies, a DRSSTC design guide on how to chose components for building such coils. Another 10 smaller high voltage related projects, 3 tube amplifiers, many online electronics calculators like IGBT gate drive, transistor base resistor, MMC calculator and single layer coils. Theory pages with data lists, file archive with a good collection of application notes. General electronics and everyday experiments.

Website and blog: http://www.kaizerpowerelectronics.dk (http://www.kaizerpowerelectronics.dk)

Youtube: https://www.youtube.com/channel/UCSukTlgTEWiL-sl0UeYeJvQ/ (https://www.youtube.com/channel/UCSukTlgTEWiL-sl0UeYeJvQ/)
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: DutchGert on April 03, 2017, 09:53:58 am
Read a few months ago some posts about Solid State Tesla Coils on your website, very good read  :-+

Would recommend it for everyone to check it out
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: madsbarnkob on April 04, 2017, 08:41:48 am
Read a few months ago some posts about Solid State Tesla Coils on your website, very good read  :-+

Would recommend it for everyone to check it out

Thank you very much :)
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: madsbarnkob on April 19, 2017, 07:26:03 pm
A new article has been added that describes the thoughts, design, construction and test of a very high impedance primary circuit QCW DRSSTC, where the voltage ramp is coming straight from half wave rectified mains supply and a mains synced interrupter is used to trigger at the right interval.

The article covers the fall pits and strange behaviour of Tesla coils driven in this manner.

The project is highly experimental and the results were not as satisfying as expected, but problems with switching transients was a much bigger issues than initially thought of.

Read it all, see all the pictures and view all the videos at: http://kaizerpowerelectronics.dk/tesla-coils/kaizer-drsstc-iv/ (http://kaizerpowerelectronics.dk/tesla-coils/kaizer-drsstc-iv/)
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: madsbarnkob on June 14, 2017, 08:56:45 pm
I made a new channel trailer for my youtube channel, which is more action packed than the old one, what do you think?

New trailer:
https://www.youtube.com/watch?v=X69q7pcvIrE (https://www.youtube.com/watch?v=X69q7pcvIrE)

Old trailer:
https://www.youtube.com/watch?v=aUXePwstA48 (https://www.youtube.com/watch?v=aUXePwstA48)
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: Cliff Matthews on June 15, 2017, 12:20:40 am
It's better now, but since you asked, I'll put in my 2-cents... You look a little rigid and need to loosen-up a bit. Also, stop looking up to your right before cutting forward. Fasten your eyes and maybe experiment to see how a brief mischievous eye works for your style (you may not be comfortable with that so try what works for you - but be sure to hold the eyes till the first cut).

Since HV is kind of risky and exiting stuff, a continuity of background beat music is catchy (volume and edge should suite you not anyone else). Raise and lower background volume to not compete with voice-overs and effects. Since it's short, make sure cuts are fast with some light-flash cuts and definitely in-sync with the rhythm. Maybe some help here (https://www.videomaker.com/community/forums/topic/cut-to-beat-vs-against-the-beat).

Lastly you may want to cut down, break-up or even lower the long spark sound at the beginning, since noisy intro's get old pretty quick when returning to the channel (but it could be just me the semi-retired schlager musik fan).
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: madsbarnkob on June 15, 2017, 06:48:45 am
Thank you for the feedback.

I know I am a little stiff in it, I think it comes from English being my 2nd language and maybe a little stage freight, handheld camera as I do not even have space for a tripod in the cramped lab :) So I spend too much brainpower on keeping camera still enough, to keep my head in the shot etc etc. I never make a script beforehand, I do retake some scenes, I often feel the big disadvantage of being alone to do both experiments and filming, its hard to do both really good.

I do try to be more happy, less dry in my speech and so on, but damn its hard when it gets technical :)

Problem with music and youtube is that they will almost instantly slam you with a copyright claim, so I just stopped using it, maybe once I build my sequencer/VCOs I can make my own, but it will hardly be any good. Even royalty free music / commercial free music does not go free of this.

I made that splash screen with spark sound as my trademark, as you have seen on many videos, lowering the sound and shortening it to 2 seconds will be tried in the future.
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: madsbarnkob on November 27, 2017, 10:16:14 am
I did some more experiments and teardowns, I also made a new intro splash which is used in these two latest videos

https://www.youtube.com/watch?v=6dhek53Tvp0 (https://www.youtube.com/watch?v=6dhek53Tvp0)

https://www.youtube.com/watch?v=VabalurNbTw (https://www.youtube.com/watch?v=VabalurNbTw)

I have been working on getting better audio (external active microphone on DSLR), unless its handheld smartphone recordings and lightning, but a 10 sq.m. lab that contains 9 sq.m stuff really makes things difficult, but I do not want to let that stop me from making videos :)
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: madsbarnkob on December 31, 2017, 07:00:15 am
Happy new year to all the readers, followers, subscribers, liker's and users that has to do with reading, commenting and writing on www.kaizerpowerelectronics.dk (http://www.kaizerpowerelectronics.dk) or www.highvoltageforum.net (http://www.highvoltageforum.net)

I have filmed a small new year special video for you all! See you all in 2018 for more high voltage exploration and experimentation!

https://www.youtube.com/watch?v=NyrSnRc63RM (https://www.youtube.com/watch?v=NyrSnRc63RM)
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: Cliff Matthews on December 31, 2017, 01:40:12 pm
Well done and happy new year to you and your family!
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: madsbarnkob on June 07, 2018, 08:36:34 am
I bought a house and that is why updates have been rare, as I went into deconstruction/construction mode. I have however made a few small videos along the way to show the progress of moving all the electronics and get settled in a new work shop/lab.

Before moving out
https://www.youtube.com/watch?v=VWj_7vyFVuw (https://www.youtube.com/watch?v=VWj_7vyFVuw)

Moving out
https://www.youtube.com/watch?v=dHbSk7di_qE (https://www.youtube.com/watch?v=dHbSk7di_qE)

The new place
https://www.youtube.com/watch?v=fis6WOPAeBg (https://www.youtube.com/watch?v=fis6WOPAeBg)

Some kind of order is restored in the work shop
https://www.youtube.com/watch?v=G8orLYYzmEg (https://www.youtube.com/watch?v=G8orLYYzmEg)
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: madsbarnkob on November 08, 2018, 08:00:03 pm
There has also been a lot of teardown videos etc, you can find that on the channel

Seems that I forgot to post part 5 long ago, so here is both part 5 and part 6 :)

https://www.youtube.com/watch?v=zaaS696Uf2g (https://www.youtube.com/watch?v=zaaS696Uf2g)

https://www.youtube.com/watch?v=Gwc8fv8Zg9k (https://www.youtube.com/watch?v=Gwc8fv8Zg9k)

I am operational again!
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: johnlsenchak on November 11, 2018, 08:09:29 pm
Glad  to see you here   !   

Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: madsbarnkob on April 24, 2019, 06:51:06 am
All MIDI files played can be found in this thread: https://highvoltageforum.net/index.php?topic=118.0 (https://highvoltageforum.net/index.php?topic=118.0)

DRSSTC1 information: http://kaizerpowerelectronics.dk/tesla-coils/kaizer-drsstc-i/ (http://kaizerpowerelectronics.dk/tesla-coils/kaizer-drsstc-i/)

Popcorn
https://www.youtube.com/watch?v=SBAaVIW6ZM4 (https://www.youtube.com/watch?v=SBAaVIW6ZM4)

Star Wars - Imperial Death March
https://www.youtube.com/watch?v=TTgFXJ-Elw8 (https://www.youtube.com/watch?v=TTgFXJ-Elw8)

Dave Brubeck - Take Five
https://www.youtube.com/watch?v=PGdsCUe47oI (https://www.youtube.com/watch?v=PGdsCUe47oI)

Ghostbusters theme

https://www.youtube.com/watch?v=ofsA_CwkwRE (https://www.youtube.com/watch?v=ofsA_CwkwRE)

The Buggles - Video killed the Radio Star

https://www.youtube.com/watch?v=br-d5O3ZSfM (https://www.youtube.com/watch?v=br-d5O3ZSfM)

Awolnation - Sail

https://www.youtube.com/watch?v=VteaEB_I7Ww (https://www.youtube.com/watch?v=VteaEB_I7Ww)
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: madsbarnkob on May 19, 2019, 09:28:11 am
Part 1 and 2 of a little series on a 750W solar project I am currently testing/building.

https://www.youtube.com/watch?v=feY76C9c-V8&t=127s (https://www.youtube.com/watch?v=feY76C9c-V8&t=127s)

https://www.youtube.com/watch?v=xBUDq71q76I (https://www.youtube.com/watch?v=xBUDq71q76I)
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: madsbarnkob on June 04, 2019, 06:35:58 am
https://www.youtube.com/watch?v=USN_wnYLLQU (https://www.youtube.com/watch?v=USN_wnYLLQU)

A teardown of a ESAB Caddy 1500i TIG welder, a run down of the current paths in the system and I show which parts I kept.

Datasheet on the unit: https://www.esab.dk/dk/da/products/arc-welding-equipment/tig-equipment-cc/industrial-equipment/caddy-tig-1500i-2200i-ta34.cfm (https://www.esab.dk/dk/da/products/arc-welding-equipment/tig-equipment-cc/industrial-equipment/caddy-tig-1500i-2200i-ta34.cfm)
Title: Re: Kaizer Power Electronics - www.kaizerpowerelectronics.dk
Post by: madsbarnkob on June 12, 2019, 12:54:46 pm
https://www.youtube.com/watch?v=F7PyPinI6Pc (https://www.youtube.com/watch?v=F7PyPinI6Pc)

 In part 3 I test the setup with all 3 panels connected and look at the performance over the last 8 days.

It all consists of:

3x 250W solar panels

1x Victron SmartSolar 100|30 MPPT battery charger

2x Norbatt 12V 150Ah batteries

1x 750W 24VDC to 230VAC inverter

Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on June 21, 2019, 07:14:38 am
Teardown of the Siemens Polyphos 30 X-ray head which contains step-up transformers, voltage multipliers and a rotating plate x-ray tube and a lot of oil!

https://www.youtube.com/watch?v=5ylabpdv2e8 (https://www.youtube.com/watch?v=5ylabpdv2e8)
Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on June 30, 2019, 05:07:43 pm
Teardown of the Siemens Polyphos 30 collimator and image plate. Collimator had an interesting moving blinds design with a lot of gears, pulleys and strings. Image plate has a lead grid and some kind of sensor.

https://www.youtube.com/watch?v=089yxpuISio (https://www.youtube.com/watch?v=089yxpuISio)
Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on July 09, 2019, 05:08:38 pm
Teardown of the Siemens Polyphos 30 X-ray systems control panel including computer, safety functions, HMI and high voltage inverter circuit.

https://www.youtube.com/watch?v=EqzAJoMWSPg (https://www.youtube.com/watch?v=EqzAJoMWSPg)
Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on July 17, 2019, 08:03:44 pm
I found a old 3.5" floppy drive cleaning kit and tried it out on a defective computer/floppy drive/floppy that I had. It would constantly ruin "new" disks and leave them with few kb of useful space.

https://www.youtube.com/watch?v=LdUmBHwkkt8 (https://www.youtube.com/watch?v=LdUmBHwkkt8)
Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on July 27, 2019, 02:23:41 pm
https://www.youtube.com/watch?v=Psnsvagsabs (https://www.youtube.com/watch?v=Psnsvagsabs)

A teardown of a Danfoss VLT6000 4kW VFD, a run down of the current paths in the system and I show which parts I find to have a value.

Datasheet on the unit: https://www.danfoss.com/en/products/ac-drives/dds/vlt-and-vacon-legacy-drives/vlt-6000/#tab-overview (https://www.danfoss.com/en/products/ac-drives/dds/vlt-and-vacon-legacy-drives/vlt-6000/#tab-overview)
Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on August 16, 2019, 06:07:11 pm
https://www.youtube.com/watch?v=7M0qlVOEySU (https://www.youtube.com/watch?v=7M0qlVOEySU)

A teardown of a ESAB Power TIG LTR200 welder, a run down of the current paths in the system and I show which parts I kept.
Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on September 05, 2019, 06:38:16 pm
Teardown of a Nokia Siemens Networks Flexi Multiradio base station. This have been in service as a 3 antenna system for mobile telecommunications.

GSM/EDGE, WCDMA/HSPA and LTE capable. 3x90 Watt output power.

https://www.youtube.com/watch?v=nL69J6KHYRE (https://www.youtube.com/watch?v=nL69J6KHYRE)

Flexi RF Module Triple (FXxx)

The Flexi Multiradio Radio Frequency Module (FXxx) or RF Module, is a 3-branch multicarrier,multi-standard radio transceiver module. The module consists of three independent branches, capable of transmitting and receiving signals of multiple radio technologies concurrently:

    Up to 6 GSM carriers with 400 KHz minimum carrier separation
    Up to 4 WCDMA carriers with 4.6 MHz minimum carrier separation
    Multi-carrier LTE signal with 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, and 35 MHz carrier bandwidth
    Multi RAT operation with combination of GSM, WCDMA, and LTE

The RF Modules FXDA, FXDJ, FXEA, FXCA, and FXFA/ FXFB are referred to as 70W RF Module variants. RF Modules FXEB and FXDB are referred to as 90 W RF Module variants. Each branch consists of a transmitter and two receiver chains. FXxA and FXFB (70W) variants have front end software tunable filters (STuF). 90 W RF Module variants have fixed full band filters. FXxx is a 3U high module with an integrated, replaceable 3-fan assembly for module cooling. The supported functions are:

    Chaining up to three RF Modules with OBSAI RP3_01
    2-way receive diversity in the receiver chains
    Integrated antenna line supervision
    MHA, Antenna Hopping, EGPRS2, and VAMOS support
    Digital and control circuitry, optical interface, DC/DC power conversion, and other necessary functionalities
    Integrated DC line OVP, Class II rated to 5kA pulse (FXFB, FXDB/FXEB)
    Remote Electrical Tilt (RET) support (FXFB, FXDB/FXEB)

Flexi Multiradio BTS GSM/EDGE modules are equipped with an integrated air guide plate providing full thermal compliance without casings. This allows installation of the modules without casings in Flexi cabinets and enclosed 19″ racks. Casings and covers are recommended in standalone 19″ racks (no cabinet) for safety reasons. Casings are not part of the FXxx delivery package. If the configuration requires casings, Flexi BTS Module Casing (EMHA) kits must be ordered.

The Flexi Multiradio RF Module variants are:
Version    Description
FXDA     GSM 900 (E-GSM) 70W
FXDJ     GSM 900 J-Band (P-GSM for CDMA co-siting) 70W
FXEA     GSM 1800 70W
FXCA     GSM 850 70W
FXFA/FXFB GSM 1900 70W
FXDB     GSM 900 (E-GSM) 90W
FXEB     GSM 1800 90W
Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: Cliff Matthews on September 05, 2019, 06:47:48 pm
On the last 3 video's, I have to say the mug is a nice touch sir! (Now I have to pour me a coffee..)
Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on September 16, 2019, 07:32:48 pm
I have news about my solar setup, summer is over and so is the solar setup :( In part 4 I take a look at the efficiency and look at the performance over the last 60 days.

https://www.youtube.com/watch?v=0ojotLDd4PY (https://www.youtube.com/watch?v=0ojotLDd4PY)
Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on September 26, 2019, 08:33:38 am
Thank you Cliff, I also love my mug and the coffee inside of it, it is needed!  :=\

Also a new video :)

https://www.youtube.com/watch?v=Uzomw5KOKlw (https://www.youtube.com/watch?v=Uzomw5KOKlw)

The high resolution pictures and circuit explanation in text are hosted on my website: http://kaizerpowerelectronics.dk/teardown/nokia-siemens-flexi-3x90w-fxeb-1800mhz-base-station-teardown-power-amplifier-part-2-of-2/ (http://kaizerpowerelectronics.dk/teardown/nokia-siemens-flexi-3x90w-fxeb-1800mhz-base-station-teardown-power-amplifier-part-2-of-2/)
Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on September 30, 2019, 06:18:25 am
The 1800W IH is now boxed up with all power supplies, water cooling, foot switch, current meter and insulated work coil.

https://www.youtube.com/watch?v=Q3JOZFh0z_Y (https://www.youtube.com/watch?v=Q3JOZFh0z_Y)
Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on October 03, 2019, 07:53:05 am
Test with using regular mineral wool for house insulation, to insulated the work coil in order to achieve higher steel temperatures.

https://www.youtube.com/watch?v=VCfnuYSuDhc (https://www.youtube.com/watch?v=VCfnuYSuDhc)

Here is another try, just with horizontal instead to contain some more heat, accidentally melted some plastic on the enclosure from that

https://www.youtube.com/watch?v=8Xo6V50JdDw (https://www.youtube.com/watch?v=8Xo6V50JdDw)
Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on October 07, 2019, 07:48:40 am
https://www.youtube.com/watch?v=OlPXeR4Tb9I (https://www.youtube.com/watch?v=OlPXeR4Tb9I)

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.
Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on October 16, 2019, 07:11:38 am
https://www.youtube.com/watch?v=MStp3eDq1oQ (https://www.youtube.com/watch?v=MStp3eDq1oQ)

I needed a 50A current meter for the 1800W induction heater ( https://highvoltageforum.net/index.php?topic=530.0 (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 (http://stiftsbogtrykkeriet.dk/~mcs/Scale.html)
Link to Meter from Tonne software: http://www.tonnesoftware.com/meter.html (http://www.tonnesoftware.com/meter.html)
Title: Re: KPE - www.kaizerpowerelectronics.dk (see latest post for new videoes)
Post by: madsbarnkob on November 08, 2019, 01:37:35 pm
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.

https://www.youtube.com/watch?v=d0CsY1bC3pI (https://www.youtube.com/watch?v=d0CsY1bC3pI)

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 (http://nerdipedia.com/wiki/tiki-index.php?page=Smart+laptop+charger)
Title: Worlds Weirdest Microwave Oven, From A Weapons Factory - The Husqvarna Cupol
Post by: madsbarnkob on November 25, 2019, 09:33:30 am
https://www.youtube.com/watch?v=DZLMiUEVKNM (https://www.youtube.com/watch?v=DZLMiUEVKNM)

Teardown of a 1970’s Microwave Oven from Husqvarna. The model “Cupol” was a iconic design from the Swedish designer Carl-Arne Breger.

Additional information and pictures of the Cupol Microwave Oven and its designer.
https://digitaltmuseum.se/021026355944/mikrovagsugn-for-metaller-och-elektronik (https://digitaltmuseum.se/021026355944/mikrovagsugn-for-metaller-och-elektronik)
https://www.minnenasjournal.nu/carl-arne-breger-designer-mr-plast-han-med-hinken/ (https://www.minnenasjournal.nu/carl-arne-breger-designer-mr-plast-han-med-hinken/)
http://blogg.tekniskamuseet.se/raceforarens-mammas-mikrovagsugn/ (http://blogg.tekniskamuseet.se/raceforarens-mammas-mikrovagsugn/)
https://es.wikipedia.org/wiki/Horno_de_microondas#Historia_del_horno_microondas (https://es.wikipedia.org/wiki/Horno_de_microondas#Historia_del_horno_microondas)
https://www.flickr.com/photos/lunar-1/29857467730 (https://www.flickr.com/photos/lunar-1/29857467730)
Title: Aethra CCD Webcam Teardown - From Back When Streaming Was Expensive!
Post by: madsbarnkob on December 08, 2019, 12:36:33 pm
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.

https://www.youtube.com/watch?v=4SyETX7Sfb0 (https://www.youtube.com/watch?v=4SyETX7Sfb0)