Dave’s local shopping centre just installed shopping trolleys with electronic locking wheels fro ma company called Gatekeeper System, how does it work? Teardown time! Subscribe on Library: https://lbry.tv/$/invite/@eevblog:7 FCC website: https://fccid.io/SOX-W9200/ Forum: https://www.eevblog.com/forum/blog/eevblog-1287-gatekeeper-shopping-trolley-lock-investigated/

What is “Design by Inspection” Dave answered what he thought was an obvious forum question, but to beginners it’s not so obvious. Rather than build something up and test, let’s do design by inspection. Subscribe on LBRY: https://lbry.tv/$/invite/@eevblog:7 Forum: https://www.eevblog.com/forum/blog/eevblog-1285-how-to-do-design-by-inspection/

More Mailbag! Subscribe on LBRY: https://lbry.tv/$/invite/@eevblog:7 Forum: https://www.eevblog.com/forum/blog/eevblog-1286-mailbag/ SPOILERS: BENQ Screenbar Plus monitor desk light: https://amzn.to/37BTXIO 12:27 Circuitmess Ringo DIY Mobile Phone Kit https://www.circuitmess.com/ringo/ 23:14 Essential Electric Circuits book: https://amzn.to/32elSxz 29:45 Chumby teardown! 38:02 SPO256-AL2 Speech Allophone chip 41:47 PCB business card

Let’s save 30 cents/unit and stuff the environment! How can bad and cheap product design kill the environment by requiring vastly more energy generation, delivery and PF correction infrastructure? Dave looks at the shockingly energy wasteful design of mains powered smoke alarms. Subscribe on LBRY: https://lbry.tv/$/invite/@eevblog:7 Forum: https://www.eevblog.com/forum/blog/eevblog-1284-how-bad-product-design-kills-the-environment/

What is Mains Ripple Injection and control? A mystery bunker item teardown turned out to be a very interesting and obscure bit of test kit. Subscribe: http://www.eevblog.tv Forum: https://www.eevblog.com/forum/blog/eevblog-1283-what-is-mains-ripple-injection/

How to design your own custom membrane keypad and get it manufactured, to make your products look really professional. It’s easier and cheaper than you think! Subscribe: http://www.eevblog.tv Forum: https://www.eevblog.com/forum/blog/eevblog-1282-design-your-own-membrane-keypad/

Forum: https://www.eevblog.com/forum/blog/eevblog-1281-garmin-gps-repair/ Repair of a Garmin GPS unit, with characteristic Dave screw-up and Murphy. https://www.eevblog.tv

Dave upgrades the processor in the dumpster Lab recording PC to one from another dumpster PC. It’s dumpsters all the way down… Subscribe on LBRY: https://www.eevblog.tv Forum: https://www.eevblog.com/forum/blog/eevblog-1280-dumpster-lab-pc-upgrade/

The best dumpster PC find yet! Some software hacking required to defeat Windows 10 security though. Subscribe on LBRY: https://eevblog.tv/ Forum: https://www.eevblog.com/forum/blog/eevblog-1279-best-dumpster-pc-find-yet!/

Random Bunker dumpster item teardown. A 20 year old Australian designed and made electric fence controller. Repair guides are here: https://pakton.com.au/support.php Forum: https://www.eevblog.com/forum/blog/eevblog-1277-electric-fence-controller-teardown/