EEVblog

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/

Dave got his hands on a piece of the protective covering of the Solaroad in Krommenie in the Netherlands. How much light does it block? Subscribe on LBRY: https://lbry.tv/@eevblog:7 Thanks to Stop Solaroad: https://www.youtube.com/channel/UCRhclm-nzJ1PaE2XmjPcTog https://twitter.com/Stop_Solaroad Forum: https://www.eevblog.com/forum/blog/eevblog-1276-solar-roadways-surface-tested!/

How much has UHF technology progressed in 20 years? A teardown of a 2000 vintage Uniden 500mW UH040 UHF Walkie Talkie to a modern kids 500mW version at half the size and 1/10th the cost! Bonus UH750 5W teardown. Forum: https://www.eevblog.com/forum/blog/eevblog-1275-uniden-uhf-walkie-talkie-teardowns/

Testing 7 different brands of AA Alkaline batteries in two different configurations over 10 months to see if they leak. Duracell, Energizer, Varta, Panasonic, Fujitsu, HVP70 High Voltage Probe: https://www.eevblog.com/product/hvp70/ Subscribe on LBRY: https://lbry.tv/@eevblog:7 Forum: https://www.eevblog.com/forum/blog/eevblog-1274-long-term-alkaline-battery-leakage-testing/

An explanation of near-field vs far-field in relation to EMC compliance testing. H-field magnetic probes vs e-field electric probes. Explanation extraction from video #1176 Wideband EMC log-periodic antenna: http://s.click.aliexpress.com/e/DQeIdwZ6 Near field probes: http://s.click.aliexpress.com/e/N5wdxeFQ Subscribe on LBRY: https://lbry.tv/@eevblog:7 Forum: https://www.eevblog.com/forum/blog/eevblog-1273-emc-near-field-vs-far-field-explained/

More Mailbag! Subscribe to Dave on LBRY: https://lbry.tv/@eevblog:7 SPOILERS: Vintage Tek Scopes Group https://groups.io/g/TekScopes 2:57 8 Cent Touch Sensor Chip TTP223 from TonTek: https://lcsc.com/products/Touch-Screen-Controller-ICs_902.html?q=ttp223 http://www.tontek.com.tw/product/product2?lang=en&idx=42 9:08 DefPom’s new open source BOM tool MyPartsBin: https://mypartsbin.com/ https://www.youtube.com/user/TheDefpom Casio FX-730P Calculator 11:49 FREE Multimeters went to a good cause, and Amazon Returns 14:07 CB2 Micro Kit: http://cb2.qrp.gr/ 17:02 ...