One item mailbag! A look at the Swissmicro DM42, the world’s most precise pocket calculator. A clone and improvement of the famous HP42S, with open source firmware based on the Free42 platform. https://www.swissmicros.com/dm42.phphttp://thomasokken.com/free42/ Forum HERE

PCB mod boards are useful for a whole range of applications and scenarios from production to upgrades, repair, and hacks. Dave shows you several examples and talks about creating manufacturing panels for them, along with castellations, V-Scoring, routing, and manufacturability. Forum HERE

A look at the dual bipolar transistor zener clamp circuit, and it’s usefulness as a fast low leakage overload clamp. The first part is lifted from video #1000 with 12 minutes of extra commentary. Interview with Dave Taylor, designer of the famous Fluke 8060A multimeter Forum HERE

A look inside the die-cast alloy Focal Professional CMS40 active nearfield studio monitor speakers. Forum HERE

More from the Mailbag. MailbagPO Box 7949Baulkham Hills NSW 2153AUSTRALIA SPOILERS:CrowPi Raspberry Pi Learning kitAnd scratch programming.Mr FusionPlay With Junk Youtube channelLED Claytons Nixie Clock kit & Muzio – Music Reactive Led LampSipeed MAIX : The World First RISC-V 64 AI Module for edge computing:Spacial microphone array and video camera face tracking demos

A surprising fault in the 4K LG Dumpster TV. Using the block diagram and schematic to track down the likely culprit and reflowing the BGA’s in an attempt to fix the fault. Forum HERE

Let’s do some programming, early 1970’s style with a teardown of the Canon Canola SX-100 Programmable Calculator Forum HERE

Dave’s 120V Weller WE1010 released the magic smoke when plugged into 240V… PEBKAC for sure, but a potentially dangerous design flaw too? Forum HERE

Dave finds a sweet Yamaha RX-V579 surround sound receiver with all the bell and whistles in the dumpster! Forum HERE Update video:

How do Electrostatic loadspeakers work? Teardown of the BenQ Trevolo S Electrostatic bluetooth speaker. Forum HERE