EEVblog No Script, No Fear, All Opinion

Modifying an old Maggy/Luxo magnifying lamp to get LED lighting and work from a Sony NP-FW50 battery.Video available on Odysee and Utreon

How you can use your multimeters capacitance range to measure inductors, using the reciprocal method. Forum: https://www.eevblog.com/forum/blog/eevblog-1465-measure-inductors-using-a-multimeter/ Podcast: Download

The TOP 5 Jellybean comparators, plus a bonus and special snowflake choice. 00:00 – Jellybean Comparators 01:20 – Traps for young players using Opamps as comparators 04:43 – Is the old School LM311 still THE jellybean? https://www.ti.com/lit/ds/symlink/lm311-n.pdf 11:17 – TS391 Small single comparator https://www.mouser.com/datasheet/2/389/cd00001660-1795546.pdf 16:33 – LM393/LM2903 Dual comparator https://www.ti.com/lit/ds/symlink/lm393a.pdf …

What’s in Dave’s Mailbag? Forum: https://www.eevblog.com/forum/blog/eevblog-1463-mailbag/ SPOILERS: 00:00 – Mailbag Bonanza! 03:24 – 3M IDC Crimping tool 04:57 – Bulova Accutron Watchmaster battery tester 06:52 – The best button EVER! 07:24 – Continentak Specialties Corporation breadboard 07:53 – Moving Iron AC ammeter 09:29 – Analog Devices power brick 09:57 – …

As if Dymo adding DRM to force you to use their labels wasn’t low enough, they have been BUSTED reusing their old 450/4XL Amazon listings in order to keep all their old positive reviews to make you think people are positively reviewing their new 550/5XL DRM model! This deception should …

Don’t buy the new Dymo 550 or 5XL label printers, they now use DRM NFC/RFID technology in the paper rolls to force you into using their labels at 10 TIMES the cost! EFF: https://www.eff.org/deeplinks/2022/02/worst-timeline-printer-company-putting-drm-paper-now NXP NFC chip: https://www.nxp.com/docs/en/data-sheet/SL2S2602.pdfSLRC610 RFID/NFC frontend: https://au.mouser.com/datasheet/2/302/SLRC610-1127743.pdf Forum: https://www.eevblog.com/forum/reviews/dymo-550-thermal-printer-drm-hacking/ Photos: Podcast: Download

Join Dave in the search for an alternative replacement MOSFET. It might not be as easy as it sounds. Talk about how to identify components and circuit function, MOSFET parameters, and using google and parametric searches on supplier and manufacturer websites. Can YOU find a -30V 17A P Channel SO-8 …

Dave repairs his failed Aputure Amaran HR672C LED studio light which is mysteriously killing batteries and falsely indicates charging when no batteries are installed. And salvaging the spare part from an old dumpster laptop! Forum: https://www.eevblog.com/forum/blog/eevblog1460-interesting-repair-of-an-aputure-amaran-led-studio-light/ Podcast: Download

Is it worth salvaging parts from a consumer HP office Inkjet Printer/Scanner from the dumpster? Forum: https://www.eevblog.com/forum/blog/eevblog-1459-is-it-worth-parts-salvaging-an-inkjet-printerscanner/ Podcast: Download

Can’t see those pesky laser etched part numbers on chips? Dave demonstrates what’s happening with the microscope polarising filter lenses on Twitter that’s blowing people’s minds. Does it actually work? And other tricks of the trade. https://twitter.com/azonenberg/status/1494061604161220615 https://twitter.com/ghidraninja/status/1494343655053832203 Aputure Amaran AL-M9 LED light https://amzn.to/3H0O5KW Leica microscope brochure: https://downloads.leica-microsystems.com/Leica%20LED3000%20RL/Brochures/Leica%20LED3000-5000_Brochure_EN.pdf Forum: https://www.eevblog.com/forum/blog/eevblog-1458-microscope-polarising-magic!/ …

Old school mailbag. Forum: https://www.eevblog.com/forum/blog/eevblog1457-old-school-mailbag/ SPOILERS: 00:00 – Old School Mailbag 01:09 – TOASTY Quadcopter ESC 08:07 – The best XMAS Tree LED light yet https://www.elimo.io/ 11:26 – Kaiweets ST600Y Multimeter https://s.click.aliexpress.com/e/_ALpSqJ 16:00 – UK Radio Teleswitch Protocol: http://downloads.bbc.co.uk/rd/pubs/reports/1984-19.pdf Podcast: Download

Repairing a Sega Toys Deathstar, err, Homestar Flux Planetarium https://amzn.to/3BsaIH7 Forum: https://www.eevblog.com/forum/blog/eevblog-1456-sega-toys-homestar-planetarium-repair/ Podcast: Download

Electrolytic capacitors produce current when they are reflow soldered! Enough to possibly light up a high efficiency LED. What is going on? A initial investigation with experiments and measurements. https://twitter.com/GregDavill/status/1491235709071818752 00:00 – WTF? 01:42 – Practical experiment heating up an electrolytic capacitor 07:37 – Data logging 09:55 – Analysing the …

Another Indiegogo marketing takedown. Kara Pure raised $1M for a water-from-air dessicant dehumidifier that costs US$1800 uses a $20 alkaline mineral filter to give you tasty filtered water for the cost only 14kWh/day in energy, at best. So dumb it hurts. https://www.alibaba.com/product-detail/ALK-alkaline-water-filter-cartridge_62009370049.html https://www.indiegogo.com/projects/kara-pure-make-pure-water-from-the-air Forum: https://www.eevblog.com/forum/blog/eevblog-1454-water-from-air-again-the-kara-pure/ Podcast: Download

Teardown of the Elgato Key Light https://amzn.to/3oqObEW Forum: https://www.eevblog.com/forum/blog/eevblog-1453-elgato-key-light-teardown/ Podcast: Download