EEVblog No Script, No Fear, All Opinion

Doug Ford, former head designer at Rode Microphones explains 48V phantom powering of microphones and how it works. There is a ton of stuff here: Electrostatic and electromagnetic noise, differential amplifiers, common mode noise, transformer magnetisation current, JFET differential driver circuits, balanced impedances, phase splitters, miller capacitance and how it …

Dave tests out his newly installed 8M/8M symmetrical VDSL2 internet connection in the EEVblog lab. Building Connect And for those that don’t believe that Telstra charge $8000/month for 10M/10M business Ethernet connection, here you go. Planet Telecommunications VC-230N Ethernet over VDSL2 router

Dave walks around Cebit Australia 2014 at Homebush Bay in Sydney. Show highlights footage HERE If you don’t like shaky hand held walking footage, motion blur, or camera image stabilisation, don’t watch it, no complaints. I do not have a steadycam, and I don’t want advice on a steadycam, and …

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

The EEVblog lab continues to get upgraded. Some more shelving installed in the office cubicle. Another lot to go in the main area, and a new island bench to come as well. Still have 3.7m of ESD matting left over from that 10m roll. They fitted just perfectly in the …

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 …

Hack A Day are running the biggest electronics hardware design contest ever. The winner gets to fulfill every nerds fantasy, a trip to space! Dave is going to be one of the judges, so start sucking up now… The contest is to design an “open connected device”. So basically anything …

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 …

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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 …

Part 3 of microphone technology with Doug Ford, former head designer at Rode Microphones. This video discusses both regular condenser and electret condenser microphone construction and physical properties. All videos in this series are HERE Forum HERE Podcast: Download

What’s inside a $13K Agilent Source Measure Unit capable of 15fA and 100nV resolution? Plus triaxial cables, and low current measurement connection. Data Sheet Connection Guide Component Datasheets: FDS8978 Dual MOSFET OPA1611 Audio Opamp ISO7240A Isolators ADS8202 Diff Amp ADS1675 24bit ADC 30N06 MOSFET Forum HERE High Resolution Teardown Photos: …