Come on a ride as Dave repairs an intermittent Keithley 177 Microvolt DMM, garden paths and all. Service manual & Schematic ADC Datasheet 555 Timer T-Shirt HERE Negative Feedback T-Shirt in the EU through Fabrily Forum HERE Podcast: Download

As the titles says, Negative Feedback T-Shirts are now available in the EU through Fabrily. This should work out cheaper for postage than ordering through Teespring in the US. CLICK HERE to get one.

A look at the Ultra Micron, the world’s smallest digital ionising radiation dosimeter, and it’s Open Source Hardware. Github page is HERE SBM-10 Russian Geiger-Muller Tube DATASHEET Forum HERE Podcast: Download

Dave opens his mail. A potpourri of items this week. Forum: http://www.eevblog.com/forum/blog/eevblog-775-mailbag/ SPOILERS: The Ultra Micron world’s smallest digital dosimeter / Geiger counter, and it’s open source! Full teardown video HERE The Stick-Vise PCB Holder Russian nixie tube display The 1962 Ferrari 250 GTO Telsa merch Buzz Aldrin’s Mission To …

Dave shows how to do discharge testing on AAA and AA alkaline batteries, for the specific purpose of investigating how much energy is left under the industry standard 0.8V cutout voltage. This is an explanation of the test setup, verification, and a sample plot of some data before the long …