Comments by "Mikko Rantalainen" (@MikkoRantalainen) on "Technology Connections" channel.

  1. Great video! I think the brake lights should activate based on g-forces nowadays. For example, always lit brakelight when deceleration is 0.1 g or more, or the speed is less than 3 km/h. Measuring deceleration is better than monitoring pedal input because it will lit the brake lights correctly in case of failures, too. Say the wheel bearing goes bad and the car rapidly slows down: brake light automatically lits if the deceleration is rapid enough. And I truly meant that the limit should be 0.1 g. It's better to lit the brake light a bit too soon than too late and 0.1 g is already far enough from stable movement that it shouldn't happen accidentally. 20:00 I really cannot understand the need for "operator to intentionally slow down". The brake lights is to signal other people about the fact of slowing down not to advertise intentions.
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  2. The important things about the encoding used to press stereo LPs is that the sideways movement has the highest bandwidth so it makes perfect sense to use that for the average signal between the channels. The same idea is used in digital audio compression, for example MP3 files support "joint stereo" encoding where one of the channels is encoded as delta to the main channel. Because real world stereo music typically has very similar audio on both channels, encoding one channel as difference to the another saves a lot of bandwidth.
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  3. I was actually a bit disappointed that you didn't include any reference to general relativity and impossibity to perfectly sync anything in different locations. Other than that, great video.
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  4. Pro tip: wrap a beach towel around the output hose. It will help getting the warm outside the apartment. Another tip: try to avoid getting any direct sunshine in through the windows; even a narrow slice of direct sunshine will include lots of infrared radiation which means more heat.
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  5. Cardboard for masking and tinted translucent car paint sounds like a pretty good solution. Anything meant for car painting is sure to be UV tolerant.
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  6. I live in Finland and we purchased the highest performance induction stove we could find and it still has only 3.5 kW emitters. (It has max power consumption of 10.9 kW so if you try to run all 4 emitters at the same time, each gets only about 2.7 kW per emitter. It has 3x400V 16A connection to the grid so the grid connection would allow higher power if the stove supported it.) That's good enough that we didn't get a new electric kettle when the heating element failed in the last one (that was running at 3.2 kW if I remember correctly). I often boil just 2 dl of water in a small pot which obviously boils pretty fast with 3.5 kW. Pro tip: if you have electric kettle, you can use it to boil about half the water you need for cooking. That way you can use your stove to boil some of the water and the kettle to boil the rest and you can then pour the water from the kettle to your cooking.
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  7.  @SirBlastalot  Modern cars are supposed to flash the brake lights if heavy deceleration is applied. I think it would make sense to flash the lights according to ABS activation because that would clearly communicate how close to the maximal friction the vehicle in front of you is breaking.
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  8. The biggest source of planned obsolescence is closed source software in the device that cannot be upgraded and is no longer safe to use when everything is now smart/vulnerable and connected to internet.
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  9. Get one, you'll be much happier with. The only reason to not get a dishwasher is that you don't own/have an access to a laundry washing machine and you cannot affort both - then by all means get a laundry washing machine first. And when you have both dishwasher and washing machines, next thing you should try to acquire is high power induction stove. Those are life-changing for cooking. (However, I've been told that the grid is poor enough in the USA that you cannot get high power induction stoves there. Our induction stove max input power is 10.9 kW.)
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  10. The interesting thing is how different heat pumps work below -15 °C. Some higher quality pumps using R32 refridgerant have COP around 2.0 even at -30 °C which makes them only a bit less effective than burning gas locally but how many days per year do you have at -30 °C? If it's warmer, the heat pump wins every time. We live in Finland and have latest gen split unit heat pump pumping heat into the house and we also have exhaust air heat pump that improves efficiency of the air ventilation (the efficiency of air ventilation gets above 100% when outside temperature is above 3-5 °C because extra heat is transferred to hot water). If you want heat pumps that work in cold climate, look for models intended for Nordic Countries. And check the local legislation for installation – here in Finland it's illegal to install these things by yourself unless you are a certified installer.
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  11.  @richjhart  Type C plug (CEE 7/17) is missing the grounding which makes it illegal to use for many purposes. The other type C plug (CEE 7/16) is more commonly known as Europlug and it, too, is missing the grounding. In addition, CEE 7/17 has max rating of 2.5 A which prevents its use for any high power applications. (Yes, there are two Type C plugs which have totally different designs but both are missing grounding. You should use Type E or Type F plugs only for safety but those do not fit all outlets in Europe.)
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  12. Yet another case of patents benefiting the society, right?
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  13. I remember seeing some research done that suggests that human eye considers more reddish light as "white" when the lux level goes down. And the same works for higher light levels. That's why 6500K daylight doesn't feel blueish but if you had 6500K 3W white led bulb, it would look light blue instead of white. As such, it makes perfect sense to have the color temperature go towards 2000K when the light is dimmed. That said, it appears to me tht most people cannot even notice the difference between 2700K and 4000K lights, nevermind the horrible CRI 80 Ra color reproduction. Unfortunately, I have good color vision and I cannot stand low quality lights. As a result, I still keep using actual halogen lights and hoping for good enough led lights in the future. I would want each and every bulb box to contain accurate spectral distribution graph so that I could easily avoid wasting my money on poor quality lighting. The closest to acceptable LED lights for my eyes have been those filament LED bulbs with very heavy phosphor coating which I guess generates smoother spectral distribution. For the same reason, I cannot stand those LED lights with fullyadjustable color because the spectral distribution is typically so spikey resulting in so poor color reproduction that even the skin of my own hands look weird.
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  14. 27:30 Europeans watching this diagram are just wondering why didn't you use a single 3x400V connector (IEC 60309-2 Red 3P+N+E, 6h) for all high current needs? That allows minimum of 3 separate 400V 16A phases allowing for minimum of 19.2 kW power transfer using a connector that has been widely in use here in Europe for multiple decades already. And many of those connectors already have IP67 or IP69 ratings so there wouldn't need much restrictions for the operating environment.
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  15. 8:00 Kelvin "degrees". I'm sure you did that just for extra comments. Here's one more.
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  16. 46:20 If you get one of these machines, at least get some high quality soldering iron and good flux, not something shown a couple seconds later in this video. Minimum acceptable hardware is TS-100.
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  17.  @smilerjerg  I drive manual, too, and I sometimes blink the brake lights manually even when the actual braking is engine braking only.
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  18. How much air do you exchange for your house/apartment? Here in Finland, the minimum required air exhange is 100% of the volume of the the house/apartment per 2 hours. As a result, when it gets very hot outside, you have to pump that hot air inside the house/apartment.
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  19. I think some older Epson printer+scanner combinations had similar feature.
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  20. Great video! I'd like to see a future video about different fully mechanical typewriter mechanisms.
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  21. I have to say that I was a bit disappointed that you used only 100% efficient heater. Surely there would have been a way to use a heat pump, right?
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  22. Even with all the wires and relays visible, imagine how hard it would be to figure this all out without schematics. Now imagine how hard it's to reverse engineer schematics for modern electronics – the information you need to repair modern electronics when they fail and manufacturer witholds the information because your country doesn't have right to repair legislation to force disclosure of schematics.
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  23. Big humidifiers can be found at stores that sell musical instruments. Many wooden instruments are very sensitive to too low humidity and humidifiers are used to fix the problem. I would guess that the hardware store has cheaper prices for the same stuff if the same product is available in both sources.
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  24. 21:24 Thanks for mentioning the perfume thing! Some people are nearly allergic to heavy perfume and that would be absolutely nope for them.
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  25. About that public service announcement: in addition, in case you live in a cold country that has actual winters, the incandescent light bulbs can also melt the snow from your lights unlike any LED lights. The situation where you want to have the best visibility is in the middle of night during snow storm and you definitely don't want any led lights in the rear for those cases.
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  26. Linus Tech Tips channel made a video in 2023 about an actual monitor with e-ink tech. Just search for the video titled as follows: This is the WORST Monitor Ever...ON PURPOSE! - Dasung PaperlikeU E-Ink Monitor
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  27. They could just call it "incorrect colors mode" so that people wouldn't expect too much from it.
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  28. Interesting device which I have totally missed even though I've been interested in various display technologies for a long time.
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  29. If you swapped the factory included fan to high quality one, you could get a small nearly silent minifridge. Granted the total heat transfer performance is really low and energy consumption is high. If you only need to keep stuff cool instead of cooling down hot stuff, and the peltier minifridge actually had proper insulation (spoiler alert, the cheap stuff doesn't) it could be an acceptable solution, especially with a thermostat. If somebody could create a peltier element with higher efficiency (e.g. 50% efficient meaning it would need 20W to cool down 10W) then using a peltier element based systems would make a lot more sense.
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  30. 7:00 Volkswagen solved the calibration problem even more clear: require first swipe after turning on the ignition to be initiated by the driver. This avoids ever accidentally turning on the wipers automatically and avoids swiping the windscreen if the owner knows the wipers are bad or there's sand dust on the windscreen.
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  31. I somewhat understand why modern manufacturers do not copy this automatic lowering and raising technology but they should at least copy the radiation based thermostat. That makes a lot of sense and allows toasting frozen leafs of bread, too, without any adjustments by the user. And to make the radioation based control with modern stuff, all you need is a hole for the radiation to hit the silicon based heat sensor. Add a small display to select the user requested surface temperature (with C, F or K scale) and you're done. (Though I'd prefer the system totally losing power when the power is off, though.) I'd personally prefer the manual lever activation with the magnet but add a dampener element to get rid of the noise.
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  32. Combination of superb collab and a piece of interesting technology.
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  33. A scandinavian manufacturer (Nibe) which manufactures water heaters, exhaust air heat pumps and similar stuff has computer controlled water heaters which run logic to heat the water only once per 2 weeks above 55 degrees celcius. (Of course, the cycle time is adjustable but that's the default if I remember correctly.) That's enough to kill any bacteria as long as your incoming water source is pure enough. At all other times, keeping the water a bit cooler will reduce energy usage. The hot water storage in our unit has 4 temperature sensors which monitor the amount of hot water.
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  34. Superb video! I'm already looking forward for second part. Though, I'm already hoping that this will turn into 5 episode trilogy.
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  35. 12:31 I guess the time " 420 69 " wasn't by accident here.
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  36. 24:20 I find it surprising that the button on the handle doesn't break the 12V control wire which would result in wall charger to cut the power no matter what the car/heater does with the load. Update: Oh... you explained this later in the video. The cause is that the contactor in the wall "charger" is low enough quality that it cannot be used to cut the power under load without damage. It this configuration is used to allow even cheaper wall "chargers".
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  37. Pro tip: YouTube video goes frame-by-frame with comma and period keys with some keyboard layouts when the video is paused. For some other layouts, the correct keys are "<" and ">".
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  38. 8:30 To be accurate, half of the drivers are worse than a median driver, not an average driver.
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  39.  @whuzzzup  Can you name some well known manufacturers that have 3.7 kW induction emitters (/burners)? Our stove is from year 2015 and at that time 3.5 kW was the best market had available for non-industrial design.
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  40. Great project! I think you should have installed the heater in orientation where the fan blows hot air towards the floor. This would circulate the cool air in the room faster and increase heat transfer from the heater to the room because hot air will raise towards the ceiling anyway so you should focus on getting warm air close to floor.
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  41. I don't know how much did you pay for those logging temperature probes but open source "Ruuvitag" would have been a nice option here. The idea is to run single (pretty high quality) Bosch sensor with a small battery and output the data as Bluetooth LE signal. You put a smartphone (or some other compatible device) nearby and use that to log as many sensors as you have. The con side of this setup is that you need additional device for logging, the pro side is that you can keep the logging side in room temperature and monitor all the probes wirelessly. As an additional bonus, you can change the software in the sensor devices to do other stuff that hobbyists have figured out. That said, it seems that the price of Ruuvitag has nearly doubled since it was originally published so it's starting to get too expensive.
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  42. Interesting product, and I agree this "new" design is superior! It seems that it's poorly available. I cannot find it any common shops here in Finland. Every place just sells the old style variant with two handles (obviously covered with lots of plastic to make it more "modern"). That said, Amazon seems to be show many variants when I search for "Safe Cut Can Opener".
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  43. 9:00 Different manufacturers have different ideas how to park wipers in high position. For VW cars, you have to turn off the engine and take off the key and within ~3 second activate the wipers.
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  44. I think all new houses should be built to be fully electric. And 100 A seems plenty unless you can get really cheap service with higher max current.
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  45. As a comparision, here in Finland pretty much all single family houses have 3 phase 230 V service (nominally "240 V" but intentionally run at exactly 230 V due historical reasons). And in addition to your usual circuit breakers building code requires all new wall sockets to have fault detection (50 mA leakage to ground will trip the circuit). The only exception is wall sockets designed for single use only for devices that are not moved (e.g. freeze, refridgerator and other devices you really want to keep powered all the time) where fault detection is not required. And the voltage between 3 phases is around 400 V. Most homes have service connection through three 35 A fuses that means max is 3*35A*400V = 42 kW in total. That's enough to run 10 kW stove, heat water and the house and all the electronics in the whole house.
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  46. Great research! I've been saying for a long time that I want smart fridge but not "smart as in WLAN connection and web browser" but "smart as in it optimizes second derivative of the temperature inside the fridge".
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  47. 9:27 The ultrasound humidifiers cause exactly the same power usage as the boiling water thingy - the evaporation takes the same amount of energy per 1 g of water no matter how you convert the water from dropplet to gas. In case of ultrasound humidifier the energy is taken from your house heating system. Granted, it might have better COP than 1.0 that electric heater in water can do. If you need to heat your house anyway and you need to use humidifier, the boiling versions are least bad option because it causes least issues with lime stains and avoids mold and algae inside the humidifier.
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  48. If you used Oklab color space, your color wheel would show constant brightness when you rotate the hue. Even the cyan and blue would appear to have constant brightness unlike in sRGB or many other commonly used colorspaces.
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  49. This is basically mechanical PWM controller. And I was thinking our induction stove had bad design then its PWM cycle appears to be around 3 seconds. The sound makes me think it's using relay with an actual electromagnet instead of bi-metal mechnical part, though. Actual induction switching is obviously solid state relay so I have hard time understanding why there's additional relay but maybe it's some kind of failsafe? And yes, our induction stove most definitely has actual knobs instead of touch UI. I still have to use the touch UI with one press to activate the "boost" option that increases the max power but if I'm happy without using the boost option, the real rotating knobs are enough for everything.
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  50. As a Finn, our outlets are super-safe compared to any option you can have in the US. Look for images of grounded CEE 7/3 outlets with protective shutters and CEE 7/7 plugs for details.
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  51. It seems that the hot blast lamp is basically an EGR setup for oil lamps. It reduces burning temperatures but burns the output gases more complete. And the heated input air could in theory allow oil to evaporate better. I'm not sure if that matters because you can adjust the flame height to change the evaporation rate in any case.
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  52. Pro tip: many multimeters have a separate battery voltage measurement option that applies semi-small load to test the battery under load which gives you more realistic understanding of the true state of the battery.
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  53. To keep stuff "indefinitely" in freezer, you should keep the temperature below –21 °C (about -6 °F) at all times. I doubt that this single compressor system is far from that.
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  54. I think the true use case for this tech was to verify that every one battery in newly opened package is good. If you purchase a pack of 20 batteries nowadays and actually measure every one under load, it's not uncommon to find 1 or 2 bad batteries straight from the factory.
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  55. I wish you would have included something about what the TEST button actually does in most fire detectors. Is it just battery voltage tester or does it actually excersize the circuits needed for detection?
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  56. I'd be pretty happy with $10 LED single-use light like the one shown in this video if it emits enough light (e.g. 1500 lm or more) and has good enough color rendering (for example, CRI in range from 92 to 96). I would be okay with white point in range 3500-4000 K. Support for 0-10V dimming would be really nice! However, the local market seems to sell LED lights that emit 1400 lm, have CRI 82, do not support dimming and still cost 60-110 EUR. Filament LEDs seem like the least bad option in short run.
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  57. Great video as usual! I was expecting the metering part to jam something between gears but the actual implementation was even more clever!
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  58. I had CD-R, CD-RW and DVD-RW drives in my computers over various years and I still wasn't aware that DVD-RAM was available without the cartridge! I guess marketing of DVD-RAM was total failure at least here in Finland.
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  59. Great introduction to digital pianos! I'd recommend channel called ThePianoforever if you want to learn more about digital pianos (and analog, too).
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  60. Here in Finland the solution is to have no fuse in the extension cord but have extension cords beefy enough to not be the limiting factor. In practice even the cheapest extension cords here can carry 16 A which is usually the maximum fuse used in normal homes when we have 230 V system. For US I'd think easy solution would be to require minimum wiring for 20 A or require built-in fuse if lesser wire is used. Considering the price of copper, most manufacturers would probably opt-in to built-in fuse.
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  61. The CC track for the intro was superb!
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  62. To be honest, the price of electricity has been very volatile here in Europe since the Russia attacked Ukraine. Price has been anything between 9 EUR/MWh and 550 EUR/MWh practically randomly (mostly based on wind patterns).
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  63. As a software developer with 20+ year experience, I can tell you that majority of the software developers will always implement the easiest solution that fulfills the requirements. There's no pride for your work for most developers I've met so there's no need to think how the brake lights should work. As the driver cannot see the brake lights, it's typically ignored except from the regulations. And when regulations have the word "MAY", that part will be left out from the requirements for the software.
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  64. I think the pronounciation is supposed to make "G" sound like "the" and "B" as bee. So the whole sentence is supposed to say "Yes, these light really are the bee's knees."
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  65. Great video! I've been a bit of a audiophile since around 1993 and I never heard about ability to save digital audio on analog video casettes. I did have a VHS setup with ability to store audio on the video area of the tape (I think it was called NICAM Hi-Fi) pretty soon those came available because that was at that time the highest quality you could get for cheap. (DAT was definitely higher quality but very expensive.) However, looking at the specs of NICAM today, it seems that this old Sony PCM converter could do much higher audio quality about 15 years earlier!
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  66. I'd love to see videos of this caliber for both.
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  67. Geeks obvious would need a flip clock with an NTP sync and stepper motor. That way you could get aesthetics and accurate time at the same time.
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  68. It would be interesting to see if a stack of peltier elements, each doing just 1 °C temperature difference would result in usable COP over the whole stack. Of course, the total energy transfer power would also plummet even if the efficiency would increase.
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  69. Great series! It's easy to see why pinball machines changed from relays to small computers. That said, computers require capacitors and electrolytic capacitors are much cheaper than old school capacitors of same capacity so manufacturers obviously use electrolytic capacitors. And electrolytic capacitors decay over time. This techinical issue could be fixed easily: just use the more expensive capacitors! However, it would reduce profits of the manufacturers so guess what happens in reality?
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  70. There's alternative product for that swamp cooler. It's called clothes rack with a wet towel. As a bonus, you can use clean towels directly from washing machine so it doesn't smell funny and as an extra bonus you get clean and dry towels when the process is ready.
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  71. I write software for living and I definitely belong in the group that thinks that critical systems (e.g. home heating) should not be connected to Internet. I have about 1% confidence that the manufacturers of heating appliances get software security correct to prevent hackers from taking control over the internet.
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  72. This is one of the demonstrations that would require you to be in a dark room with only the monitor giving any light (that is cover your RGB mouse and keyboard, too, if you have one). The best way to fail to see the effect is to watch the video in a small window with white or light gray background behind your window.
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  73. There are other solutions, too. Here in Finland, the cheap detergent is typically wrapped in plastic-like wrapper which is designed to melt slowly and you're supposed to get it wet during the prewash so it melts away near the start of the main cycle. So depending on the detergent you're using, the detergent should be in enclosed detergent box during the start of the wash or somewhere in the machine (we put the detergent tablet into the holder for cutlery). And if you use powder style detergent, just put some on the bottom of the machine and rest into the sealed box.
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  74. 5:45 The car DC charging protocol could have been designed to have similar design to USB PPS charging standard but it would have required more expensive wall chargers. The current decorated remote controlled contactor "charger" is much cheaper to manufacture but requires having inverter inside each car.
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  75. Just had a discussion today with somebody who claimed that latest gen Audi "matrix" headlight modules cost 3500 EUR each. And those things have polycarbonate "glass", too, so they will go bad over time. Those standardized $15 modules seem too nice compared to that.
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  76. They missed the opportunity to say that "100% of the manufacturers recommend Finish tabs"!
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  77. If you want fast charging at home even in here in Europe where 3-phase power is common so you can get 16A 3x400 V (19.2 kW) connection pretty easily to the car, the whole electric grid connection of your house may become limiting factor in cost. Our house has "only" 3x25A connection to the grid and while it can be increased with a contract change, the monthly bills for the beefier connection get much higher fast. The initial grid connection for 3x25A connection costs about 1800 EUR (including all taxes) and if you want more, the beefier options are 3x35A for 2500 EUR, 3x50A for 3500 EUR, 3x80A for 5700 EUR or 3x100A for 7100 EUR. If you live further from the existing customers, expect to at least pay 20% more. In addition to that, you get to pay monthly fees for the max current you want from your grid connection. The basic 3x25A connection costs 20 EUR/month (including all taxes) whereas, for example, 3x50A costs 64 EUR and 3x100A costs 155 EUR/month. Of course, that 3x100A connection can only deliver 3x100x400 W or 120 kW so it's still pretty slow compared to proper fast chargers available with CCS connector. And as you can see, the costs of even 120 kW level fast charging at home gets pretty expensive indeed so it really makes little sense to fast charge at home. Going from 19.2 kW charging to 120 kW charging increases your monthly costs about 130 EUR and of course, the initial connection has extra 5000 EUR additional cost. And note that you have to pay these fees for the possibility of fast charging. The actual electricity for the charging obviously goes above the mentioned costs. Suddenly that 19.2 kW sounds pretty nice deal!
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  78. Here in Finland cheapest dishwasher tablets are around 0.07 - 0.09 EUR per wash including all taxes. Our Whirlpool dishwasher also "recommends" Finish tablets and I've tested one bag of those even if they are much more expensive and couldn't find any difference in washing result. The water is really soft so that may help, too (the water is actually so soft that even though our dishwasher also supports using salt, it makes no sense to add salt in the container).
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  79. The big problem in this story is not that USPTO accepted both patents. The big problem is that USPTO cannot invalidate the patents when it figures out that accepting both was a mistake. And I'd argue that if two independant patent applications for the same thing come through nearly at the same time, the whole thing is probably too obvious and shouldn't result in a patent for neither party. The minimum bar for a patent should be insanely high in modern world, but somehow USPTO has been constantly lowering the bar for decades now.
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  80. Dual hose portable AC unit could use a LOT longer incoming air hose to help with the installation requirements. Only the exhaust hose should be kept pretty short because that hose gets really hot and is not insulated.
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  81. I agree that reverse lights should emit illumination instead of being just a signal. As a result, I typically have to put on hazards and have my foot lightly on the brake while reversing. Which is a bit tricky to do with manual gearbox while you're using clutch, too. Update: our car doesn't have backup camera for reversing but it would be really dumb to install a camera at the factory without a light source. At very least, the car should have bright IR lights at the rear of the car to allow black and white backup camera view without visible flood lights.
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  82.  @AnotherPointOfView944  Does your car have real illumination at the rear when you engage the reverse gear?
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  83. There's probably also extra magic in front of the incoming water pipe inside that heater to reduce currents from the water flow. This is usually implemented by one or two extra metal plates.
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  84.  @MikkiPike  Thanks for pointing that out. English is not my native language and I didn't expect dryer to be mixed with "washing machine". I update wording of my previous comment to make it more clear. The literal translations from my mother language (Finnish) would be "clothes washing machine" and "dish washing machine" which naturally affects how I think about those things in English, too.
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  85. I personally prefer 0-10 V dimmer switches that allow pushing full AC voltage to the lights and then the light implements the dimming without super complicated circuitry. Of course, the standards are still very lacking for that plus the need for 5 wires is a problem for most users.
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  86. Do you have a video about history of LCDs used in watches? I failed to find one.
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  87. The only bad part about the whole situation is that CCS connector with fast DC charging is so damn big. I wish Tesla would have allowed everybody to just use their connector because it's obviously superior to everybody else. The idea of putting the beefy DC charger outside the car is/was good and you need a beefy connector to handle the continous high load during fast charging but you only need two thick pins and communication channel.
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  88. Our big fridge has an optional feature (with a toggle switch inside) to keep one box in very accurate temperature around +0.1 °C and it doesn't have documentation about the implementation but everything suggests that it has a peltier element between the inside of the fridge and the inside of the box. Our fridge is around +2.0 °C otherwise so this peltier element only needs to cool down on average 1.9 °C and it can do that very accurately. Of course, that little box requires additional temperature sensor (or multiple because the whole point of this box is accurate temperature control) and since the whole fridge is already controlled by a small CPU on a small motherboard, having a couple of extra sensors and a controller for the peltier element is pretty easy. The manufacturer does warn that if you want to achieve the official efficiency posted on the ad, you cannot enable this feature. This obviously suggests that the implementation is not very efficient which points to peltier element. The advertised use for this box is to keep highly sensitive foods as close to freezing temperature as possible without accidentally freezing the foods even momentarily. Peltier elements are also used in physics experiements for accurate temperature control. In that case, the peltier element is used between main cooling element and the actual scientific instrument the temperature of which needs to be controlled accurately. As you can run peltier element with PWM controller in closed loop setup with a simple microcontroller, you can achieve highly accurate temperature control as long as your main cooling setup can get close enough to target temperature even without the peltier element.
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  89. If you actually do any winter time driving, you want that extra heat in the rear lights or the snow is going to stick in the lenses. As mentioned in the video, the faster (or should I say instantaneous) ramp up time for max brightness is definitely a bonus for brake lights.
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  90.  @Zerocool818  Yeah, what can you trust nowadays? Selling crap that can only last for 30 years should be illegal!
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  91. It's funny to think that consumers would have enough information to make a educated choice between VHS and Betamax. If capitalism requires consumers to make educated choices, we're already doomed.
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  92. I've heard explanation at local fire department that ionizing detectors are better at detecting open flame and optical sensors are better at detecting smoke from things that are about to catch fire. Sometimes the open flame produces very little visible smoke and as a result, you should have both detector types in your home. The recommendation they told us was that one should use ionizing detector in hallways or other locations required for exiting the apartment or house in case of fire and optical detectors in bedrooms.
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  93.  @pe1dnn  Yes, you're right that double isolated device shouldn't use grounding and can therefore use no-grounded plugs. The current limits of Europlug is still a problem for any power hungry devices.
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  94. In countries with mandatory fully independent earth wiring (TN-S) doing a split wall socket requires 4 wires which costs more than as a result, surprisingly many will not install split wall sockets.
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  95.  @nonAehT  Since around year 2005 Topfield TF5100PVRc / TF5100PVRt was the total winner solution here in Finland. It had normal IDE hard drive and hobbyists created superb software for it to replace the official EPG and UI (it supported running user created software from the factory!). Even today, all devices you can connect to a TV set still have worse features for timeshifting and recording TV. The biggest problem with these devices was that it only supported 576i50 so no HD of any kind was possible.
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  96. The reason "turn the thermostat too high" sometimes improves the heating speed is that the thermostat is poorly located and will get directly heated by the heating system and it will turn the heat off too soon, simply to be turned on again after the air mixes a bit and the thermostat can measure the actual temperature in the room.
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  97. Hello from Finland! Here single family homes typically have 3-phase 25 A connection. That gives theoretical max limit of 3*25A*400V = 30 kW. That's plenty to run modern houses all electric even when it's really cold outside. Our house heats the water and the house with electricity, the induction stove is fully electric and AC is fully electric (Mitsubishi LN25 so it will pump heat from outdoors to indoors even when it's –30 °C or -22 °F outside). And we have a sauna, too, which takes extra 7–9 kW, too. That said, if you want fast charger for your EV, you would need to get much beefier connection and that gets really expensive really fast here in Finland. Let's say you wanted 100 kW fast charger for your EV. It would require 3-phase 100 A connection and the montly payment for having that kind of connection would cost 167 EUR before even using any electricity. We obviously have thing called insulation in our houses. Our house has about 120 m² or 1300 sq ft and it can stay heated (we have 22 °C indoors) and heat incoming air (about 60 liters/s) with about 6 kW even when it's -30 °C outdoors (and that's assuming the both our heat pumps were broken). With properly insulated house, you could heat a literal mansion with 80 kW system.
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  98. You did great job on having a video about just one color that's actually just an alternative name for dark orange!
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