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3 hours of Dave answering questions from the Youtube audience. Part 1. Forum HERE Podcast: Download

Part 3 in the Precision Current Source series. Dave breadboards a classic precision low current source circuit using the 10V REF102 voltage reference to generate accurate 1mA and 1uA currents. Also some talk about the errors in a typical precision circuit like this. Part 2 HERE Part 1 HERE REF102 …

Dave hates products with built in charging that don’t use a standard Micro USB connector. In this case the Panasonic Lumix LF1 with its stupid proprietary connector. Why in this day and age of attempted standardisation are companies still doing this? Dave also shows off a good example, the Sony …

Part 1 HERE Dave gets his precision 1A current source circuit working on a breadboard. LTC6655 VPR221Z Precision 4-terminal Z-Foil resistor from Vishay LTC6655 Voltage Reference OPA376 Podcast: Download

A quick look at Dave’s Advantest R6142 Voltage and Current Source. Can it be used as a current reference for the uCurrent? A look at the stability with temperature and time, and absolute calibration of the unit. Is it an ebay score, or ebay junk? Forum HERE Podcast: Download

Phil VK2BDF from the Manly Warringah HAM Radio Society shows off his 1970’s vintage home made 200MHz DIY spectrum analyser. Forum: http://www.eevblog.com/forum/blog/eevblog-575-diy-1970s-spectrum-analyser/ Podcast: Download

Dave looks through the documentation for the vintage 1980 NEC PCN-1205AH 5kW Analog TV Transmitter that used to transmit the CH7 TV frequency in Sydney He then tears down the HPA-3696 IF Modulator used in the system. Facility tour HERE Forum HERE Podcast: Download

Mailbag Monday SMD Adapter PCBs NXP SMD Package Cheats: Leaded Non-Leaded HP 41 Calculator upgrade PCB OHARARP Lab Notebooks CNC-Design in Finland Laser Cut 3D Signs Hacked Microsoft Lifecam DIYINHK USB Microscope uARM 4-Axis Arduino Open Source Hardware Robotic Arm Kickstarter Forum HERE Podcast: Download

Fundamentals Friday. Dave explains Gain Bandwith Product and how it’s possible to increase your system bandwidth by cascading opamps in series. Also, a discussion on the associated noise issues. A breadboard example shows how variable GBWP can be, and how it can relate to distortion. Opamp Noise Tutorial Forum HERE …

A little behind the scenes packing and shipping the uCurrent parts off to the assembler.

What is inside one of the best quality wireless microphones on the market? Dave takes a look inside the Sennheiser EW100 G3 SK100 Bodypack Transmitter and the EK100 Diversity Receiver. Datasheets: ADF4117 SA575 BH4127 Forum HERE Podcast: Download

Ever wanted to learn practical electronics in a structured hands-on online course? My AmpHour radio show co-host Chris Gammell has an excellent new 10 week electronics course called Contextual Electronics starting TODAY! Course prices are HERE, and there are various levels of how you can participate. You can do the …

Dave cleans up the lab and adds some shelves. Exciting stuff. Original lab timelapse build: https://www.youtube.com/watch?v=lhsgJnrkQYc Forum: http://www.eevblog.com/forum/blog/eevblog-570-lab-cleanup-and-shelving/ Podcast: Download

David Kilpatrick from TXAustralia takes us on a detailed tour of the old decommissioned 10kW analog TV transmission system at the Artarmon facility in Sydney. How it all works from the broadcaster video input to final transmission output up the 180m broadcast antenna. Plus some teardowns of the old equipment …

What is the actual capacitance of typical breadboard contacts? It’s not in the datasheet, so Dave decides to measure it. It is well know that breadboards are not suitable for high frequency work due to the stray capacitance between contacts, but how bad is it really? Forum: http://www.eevblog.com/forum/blog/eevblog-568-solderless-breadboard-capacitance/ Podcast: Download