#video from #Technology-Connections on induction fluorescent #lighting
on 02026-07-16#Technology-Connections #video #toread about dishwasher detergent formulations
on 02026-05-25#Technology-Connections #video promoting Vintaglo and Tru-Tone brands of Christmas lights, as well as Sylvania’s “traditional glow” copycat, and criticizing Menards and Meijer’s attempts.
on 02025-12-06#video about three-tube CRT projectors supporting 1080i video by #Technology-Connections
on 02025-10-08#Technology-Connections #video dissecting an “Aeocky” rotary desiccant dehumidifier, which uses red-hot heating elements, a shaded-pole fan motor for the regeneration air, and a plastic cross-current heat exchanger to regenerate the desiccant and recondense the water. The main desiccant wheel has air forced through it by a large (300mm?) BLDC-like fan. He reports that it’s much smaller than vapor-compression types, the fans only consume about 12W, but the regeneration heating element is 300W, very similar to a vapor-compression device, condensing some 100g of water per hour (11kJ/g water), about ⅕ as much as the refrigerant-based unit. A Peltier-based dehumidifier was about as efficient as the desiccant-based unit in his moist bathroom, but the desiccant-based unit was able to remove water even from the 40%-RH air of his office. Most the ones he found on amazon.co.uk in the US$170–300 range were 580–735W, 7.5–11ℓ/day, and 6–7.5kg, most being almost twice as efficient as the one he tested (≈5kJ/g water). Recommends an adsorption dehumidifier brochure from Technofrigo Tuscany (“TFT dry air solutions”). #desiccants #mechanisms #HVAC
on 02025-09-03#Technology-Connections #video on 01970 "Numitron" display devices from RCA: seven-segment #displays made of red-hot incandescent filaments in vacuum tubes, basically seven-segment 5-volt lightbulbs, 25mA per filament. He also shows IV-11 VFD tubes, a seven-segment clock he made in college out of LED tape, and a clock he made out of Numitrons, driving them directly from BCD decoder chips without separate driver chips. He catalogs the design errors in the Numitron: the digits don’t lean and so the decimal point makes them off-center; the segments are too thin to be legible; the segments are too far apart (they could have actually crossed in different planes); the vertical segments extend too far; the opaque support board behind the filaments is grey rather than black, reducing contrast and blurring the segments; and the numbers are slightly crooked due to imprecise assembly of the tubes. The Russian clones are even worse.
on 02024-07-02