Comments by "Peter S" (@Peter_S_) on "Technology Connections" channel.

  1. In the right configuration, multi-stage thermoelectric coolers can achieve liquid nitrogen temperatures. I am curious how cold the cooler in a fridge would get.
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  2. Buss1000; see Pacific DC Intertie https://en.wikipedia.org/wiki/Pacific_DC_Intertie
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  3. These used to be sold at every Radio-Shack, with an accompanying paneled mirror reflector box made from black plastic and cheap pressed tin. They were quite the thing in 1976, and they still are.
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  4. That's a very incelish comment.
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  5. I was really quite impressed by this episode. It's so unassuming for the depth of detail it contains. It's remarkable in that respect.
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  6. I remember flying with Magicubes and a 110 camera, but in those days people also smoked on airplanes. It was a less delicate world.
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  7.  @ElectricNed  Duh. Who cares? When is the last time you achieved LN2 temperatures in a fridge?
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  8. The ultimate way to drive a Balafire is to hook a sine-wave oscillator up to a 100W per channel stereo power amp which has a "bridge mode" to double the wattage in mono use. Set the frequency to something between 30 and 60 Hz, hook the lamp to where the speaker would be, and turn up the volume until the AC output across the output channels is 115V. Now you can turn down the oscillator frequency for longer bulb life and less frenetic operation, but the output will fall off as the frequency gets lower than the amp was made to carry. These bulbs are precious now that they don't sell them at Radio-Shack anymore. It's about lifespan, not efficiency.
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  9.  @Renegade605  Yes, totally agree. I would love to see thermocouples in the air spaces of the cooler and the fridge, and on both surfaces of the Peltier module graphed over time. With enough channels on the data logger, I would also add ambient temp and a thermocouple on the evaporator and the condenser coils of the fridge as well as a digital input for recording when the compressor is running. There's a lot of efficiency data to be had there.
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  10.  @ElectricNed  What were you trying to achieve? Did you just want to be contradictory and state the obvious for the sake of being contradictory? Yes, thermoelectric coolers are very inefficient as stated in this video, and I've also known that since the 1970s. There's still a lot of efficiency data to be had here about multi-stage refrigeration which many people would find interesting. I hope you have a nice day.
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  11.  @jeremiahlowe3268  These devices pump heat. There's always work to do if you're above absolute zero. You may want to watch the video again.
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  12.  @lucasgroves137  Wow, you apparently have some issues. I hope you find happiness.
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  13. Have you priced such units or would that be too lame for you? Maybe you should pay the difference in cost too.
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  14.  @CooperZ2  It's a "joke" for an incel alright.
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  15. More satisfying is the click of a relay energizing a contactor to make a chonk which in turn energizes a thumper to make a LOUD thud.
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  16. They are subbed to each other's channels. That would be perfect show for the BigCliveLive channel. I could see it happening somewhat easily.
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  17. As an ex NeXT service technician (Northern San Francisco Bay Area) so do I.
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  18.  @lucasgroves137  🤣🤣🤣 Oh my.... Bless your heart.
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  19. The 'boost' button is fascinating. Thank you for your comment. Makes perfect sense but I've not seen this before as my area is heated with gas.
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  20. That's my favorite retro style so far. Switching the plastic back to glass was a huge upgrade.
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  21. LOL, I installed one of those as a 2nd horn for nudging college kids who don't pay attention to traffic. It's quite effective and perplexing.
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  22. That lamp from the 80s is a mostly analog circuit with a little bit of digital logic on the output to sequence the phase delay dimming, but it's absolutely not a microprocessor controlled device. It's tuned by circuit values in the same way that sensitive tube based VT proximity fuses were tuned during WWII; by solid design. Touch sensing based on DSP didn't become available until later, I think about a decade plus later. Even the Tontek TT6061 in that "modern" 20 year old hardware store module isn't microprocessor based. The "bootup delay" when the lamp is plugged in is actually just a capacitor slowly charging to establish voltage for the digital logic (a couple handfuls of NAND gates) to operate and to give bias generation time to come up to voltage in the oscillator and for it to stabilize.
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  23. 11:20 How did you get into my kitchen?
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  24. The one place I see this technology working great outside of special lab and process applications is making custom coolers for trucks and boats where you can run on solar power. In those cases you can use stacks of two Peltier modules to get a lot colder than single modules get, and you can use the sea or the vehicle frame to dissipate the excess heat without a fan.
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  25. Patents don't base themselves around products but rather technologies with variable implementations. I would guess the prototype circuit described may have used a 12AU7 because of the employment in operating a relay coil, however there were dozens and dozens of dual triodes available. Only the most basic mention is made of characteristics in the patent, and in use the only restriction is that one triode support an oscillator while the other switches a relay coil.
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  26.  @terreausore2435  LOL! Can you tell the difference between incel and intel? Looks like you can't. You seem to have a shortage of intellect.
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  27. Tamper resistant receptacles take the fun out of learning about electricity.
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  28. I also had a bust of Lincoln from that mold-o-rama machine in the Chicago Museum of Science and Industry, but mine was white.
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  29. Have you seen BigClive's videos on that? He's gone somewhat ornate as Clive does, and the CAD scripts are available for download in the video descriptions.
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  30.  @georgeblair7129  The plastic bulbs just look plastic to me and don't have the same depth of color as a lacquer dye. The shine of the smooth glass gives a nicer finish while the plastic ones I have are poorly molded and have obvious mold lines. The plastic bulbs I have degraded a bit outdoors and diffuse things while the glass envelopes remain more of a point source like classic incandescents. I've not seen any with fluorescent coatings... WOW! That's a whole new area!!! Too bad fluorescent pigments like sodium fluorescein don't stand up to UV. Awesome idea tough! I think I'll give it a try with some dye and clear nail polish.
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  31. Just to be pedant/technically accurate... 7:18 That Romex(tm) is indeed made from THHN, but not all Romex was in the past. Codes are better now. That cable is Romex if produced by Southwire Company, LLC but as a general type, that is called "non metallic sheathed wire" or NM for short. THHN when spoken by an electrician is almost always in reference to single conductor [very often stranded] wire commonly run through conduits.
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