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

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/

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 spreadsheet graph Forum: https://www.eevblog.com/forum/blog/eevblog-1455-capacitors-produce-current-during-reflow-soldering-wtf/

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/

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

Repairing the Fluke/Philips PM3370B combiscope. Or have we? Service manual with schematic: https://www.manualslib.com/manual/1441823/Fluke-Autoranging-Combiscope-Pm3370b.html Forum: https://www.eevblog.com/forum/blog/eevblog-1452-fluke-pm3370b-combiscope-repair/

Showing you all the tools and techniques I use to shoot videos. Cameras, lighting, sound, streaming, editing, macro phototography, microscopes, green screen, and ATEM live production system. Locals: https://locals.com/member/EEVblog

A BM235 customer has a BM235 that drains the batteries in OFF switch mode, lets look at the PCB to find out the possible culprits. Potentially applicable to any battery powered product. Forum: https://www.eevblog.com/forum/blog/eevblog-1449-what-causes-excess-battery-drain-(bm235)/

How to convert a Fluke 77 IV average responding multimeter into a True RMS model 177 for 10 cents. *Plus calibration gear Should also work for converting a Fluke 83V to 87V True RMS measurement vs Average Responding And how to calibrate a Fluke multimeter. Fluke 87V service manual with schematic: https://xdevs.com/doc/Fluke/87V/Fluke_87V_Full_service_manual_with_schematic_and_electrical_parts_list_Service_Manual-87VANFullService.pdf 00:00 – Hacking ...

Why are Fluke multimeters so expensive? PART 2 A teardown of the Fluke 70/170 series vs the Brymen BM786. Is there any design and construction difference that justifies 2-3 times the price? 00:00 – Fluke vs Brymen 01:07 – The Yellow Peer Pressure 01:57 – Fluke 77/177 vs Brymen BM786 04:01 – Ruggedness 05:05 – ...