EEVblog

Teardown of the new Keysight EDU34450A 5.5 digit Bench Multimeter Forum: https://www.eevblog.com/forum/blog/eevblog-1382-keysight-edu34450a-5-5-digit-bench-multimeter-teardown/ HiRes teardown photos:

What’s inside a 10kW linear power supply for a Coherent Skylight 300C 10W Argon Ion Laser? Teardown time! Daryl Tewksbury: https://theamphour.com/521-outdoor-laser-projection-object-mapping-with-daryl-tewksbury/ Forum: https://www.eevblog.com/forum/blog/eevblog-1381-10kw-argon-ion-laser-psu-teardown/

It’s an aussie barbie with fried IBM chips. Ken Shirriff’s blog: https://www.righto.com/ Forum: https://www.eevblog.com/forum/blog/eevblog-1380-bbq-ibm-chips/

Why does a handheld multimeter read zero volts and a bench meter reads several volts? It’s all about the NPLC’s man… Forum: https://www.eevblog.com/forum/blog/eevblog-1379-whats-all-this-nplc-stuff-anyhow/

Is the new Uni-T UT61E+ Multimeter still the bang-per-buck king the existing UT61-E was? How does it compare? Is the increased cost worth it? https://s.click.aliexpress.com/e/_AaRaJS https://s.click.aliexpress.com/e/_9foaZO And what about the ANENG AM870 at half the price? https://s.click.aliexpress.com/e/_AFiPjA Flickr photos: https://www.flickr.com/photos/eevblog/albums/72157718441411852 Forum: https://www.eevblog.com/forum/blog/eevblog-1378-new-uni-t-ut61e-multimeter/

How long does it take for your 400mA multimeter fuse to blow at 600mA? Grab a chair and watch! The amazing unpredictability of fusing current ratings at low overloads. Forum: https://www.eevblog.com/forum/blog/eevblog-1377-the-amazing-unpredictability-of-fuses/

Dave fixes a rather strange fault in his Tandy 102 portable computer. Forum: https://www.eevblog.com/forum/blog/eevblog-1376-tandy-102-vintage-computer-repair/

Another bumper Mailbag! Forum: https://www.eevblog.com/forum/blog/eevblog-1375-mailbag/ SPOILERS: 00:00 – Start 00:17 – Dave hates cats 02:29 – BIG stud power diodes and SCR’s 06:20 – Workbench of the week. Louis Borsu from Brussels, Belgium 08:20 – Amiga Addict magazine: https://www.amiga-addict.com/ 11:35 – Dave levels up in the IEEE 13:09 – Canadian LCR Reader MPA Tweezers: https://lcr-reader.com/lcrreadermpa.html ...

How easy is it to take the open source Trezor Model T crypto hardware wallet files and manufacture your own? Or to modify or improve the design? The Trezor is open source hardware, so Dave checks out the Github and looks at the hardware files available and imports into Eagle and KiCAD. Where to from ...

Part 2 of the DIY PCB LED light photography box. This time experimenting with top and bottom side emitters and paper reflectors to give an even better result. Forum: https://www.eevblog.com/forum/blog/eevblog-1372-diy-pcb-photography-light-box/

How to build your own DIY light box for photographing PCB’s Dave experiments with a cardboard box, some alfoil, and a hacked YujiLED high cri studio light. https://www.flickr.com/photos/eevblog/albums Forum: https://www.eevblog.com/forum/blog/eevblog-1372-diy-pcb-photography-light-box/

Dave is a tad obsessed with making a 10,000hr battery life bench multimeter. It’s actually not hard. Forum: https://www.eevblog.com/forum/testgear/10000hr-battery-life-bench-multimeter/

Dave repairs his pesky Kindle Paperwhite with touch screen and charging issues. Forum: https://www.eevblog.com/forum/blog/eevblog-1370-kindle-paperwhite-repair/

Dave debunks the Xiaomi Mi Air wireless charging system that claims to be able to charge at 5W up to several meters using mm wave RF beam steering technology. Where have we heard this before? The Amp Hour 5G episode: https://theamphour.com/430-shahriar-discusses-5g/ https://blog.mi.com/en/2021/01/29/forget-about-cables-and-charging-stands-with-revolutionary-mi-air-charge-technology/ Forum: https://www.eevblog.com/forum/blog/eevblog-1369-xiaomi-mi-air-wireless-charging-busted!/

Part 2, this time looking at different types of active oscillocope probes. Single ended active FET probes, differential active FET probes, current clamp probes, high voltage differential probes, positional current probes, and EMC magnetic and electric field probes. 2MHz Current clamp probe: https://www.eevblog.com/product/cp2100b/ Active FET probe: https://amzn.to/3oq0Q8g EMC probe set: https://amzn.to/39oEqAh Forum: https://www.eevblog.com/forum/blog/eevblog-1368-active-oscilloscope-probes-compared-(part-2)/