What does the UL type approval compliance logo on consumer products mean? What about TUV, ETL, GS, CCC and other marks? Dave breaks down safety standards and compliance marks. Forum HERE

Can a product work without ANY bypass capacitors? Dave finds out by “Muntzing” the Gigatron TTL computer. Lots of interesting talk on bypassing, grounding, probing, signal integrity, ground loops and noise and crosstalk. Forum HERE Links: http://www.electronicdesign.com/boards/whats-all-muntzing-stuff-anyhow http://web.mst.edu/~jfan/slides/Archambeault1.pdf https://ewh.ieee.org/r3/enc/emcs/archive/2012-10-10b_DecouplingMyths.pdf http://www.ti.com/lit/ml/slyp173/slyp173.pdf https://www.xilinx.com/support/documentation/user_guides/ug483_7Series_PCB.pdf https://www.xilinx.com/support/documentation/application_notes/xapp623.pdf

Review of the Gigatron.io TTL 8 bit retro computer kit. The processor is built entirely using TTL logic. http://www.gigatron.io Live 4 hours build: https://www.youtube.com/watch?v=wECZoUNd2GY Forum HERE

More mailbag! Forum HERE SPOILERS: Brads Projects: https://bradsprojects.com/ Microelectronics Timeline Poster http://www.engineeringminds.org/ Big Clown IoT kit: http://igg.me/at/bigclown USB TouchPad: https://www.kickstarter.com/projects/jacoburge/touchpad-the-arduino-compatible-customisable-keybo Fluxgate compass teardown Oregon Scientific temperature sensor teardown CCES-33 Calculator Kit The crustiest multimeter teardown in history Alcatel 565 Mbit/s PDH mux

A look at the amazing construction techniques used in the world’s thinnest calculator by Casio Destructive teardown on the Casio SL800 credit card calculator from 1983. It’s more interesting than expected! Forum HERE

Power supply repair attempt on an i7-2600 Dell Optiplex 990 dumpster PC. An update on previous dumpster PC’s. And the bunker to the rescue. Forum HERE

QUICK teardown of the failed KRK Rokit 6 textile (soft) dome tweeter. Forum HERE

Part 2 of designing your own custom LCD display. Looking at the manufacturers datasheet for approval, and test design considerations. Forum HERE

Fixing another two Gen 2 KRK Rokit 6 near field monitor speakers with the black gunk of death and failed capacitors. How wide spread is this problem? https://kit.com/EEVblog/youtube-video-blogging-gear LOL at KRK Systems Forum HERE

Repair of a HP Envy 23″ Touch PC found in the dumpster. Blank screen and doesn’t boot. Troubleshooting and repair to getting it booted again. New content at 20:00 Re-edited from the EEVblog2 channel video, with new happy-ish ending. Forum HERE Links: http://systats.or8.net/hpspi/