EEVblog – Podcast

Dave checks the Dallas DS1220Y chip in the Prema 6047 7.5 digit multimeter to see if the battery is dead, and if the calibration constants have been lost. ROM is HERE Previous video HERE Forum HERE Podcast: Download

Dave attended the Cebit 2014 event in Sydney at Homebush Olympic Park. Here are some highlights. The EX¹ the worlds first PCB printer. It prints silver conductive ink onto FR4, paper, mylar, or many other types of substrate. GoFar, a wireless car monitoring startup. The University of Newcastle Robotics group …

Teardown Tuesday. What’s inside a 1980’s vintage 8.5 digit multimeter, the 6047 from Prema. Or did Dave diddle himself? Forum HERE EDC Voltage Standard Calibration Check User manual High Res Photos: Podcast: Download

Mailbag Monday What should Dave do with his new lab internet bandwidth? Thermocouple Tutorial Arduino Tape Shield Arduino Thermocouple Shield MAX31855 Boldport PCBmodE Artistic PCB layout program System MERA-400 computer schematic Elecktronika MK-61 Russian Calculator Forum HERE Podcast: Download

Part 5 – Doug Ford explains the design of Electret Microphone circuits, and all the associated traps: Transconductance, correct biasing, and temperature effects, leaky JFETS, non-linear clipping & headroom, current noise and voltage noise, and pseudo bias resistors. Also, the non-intuitive concept of higher resistance = less noise, and how …