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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 …

Why do digital oscilloscopes appear noisier than traditional analog oscilloscopes? PART 2 Learn how and why your digital storage oscilloscope display the noise that it does. In this 2nd installment Dave shows how waveform update rate affects the apparent displayed noise of a waveform, and alters the waveform update rate …

Part 4 of microphone technology with Doug Ford, former head designer at Rode Microphones. In this video Doug discusses how to design a condenser microphone, in particular the Rode Classic II microphone. Many things discussed include: External polarisation voltage generation and the relationship with sound pressure. The trade-offs involved in …