EEVblog #1122 – Raspberry Pi 3 PoE Hat FAIL Investigation
The new official Power Over Ethernet (PoE) hat for the Raspberry Pi 3 B+ has been reported to fail with an overcurrent error when powering USB devices. Dave investigates and narrows it down until, well, something goes horribly wrong… Rpi forum Forum HERE
EEVblog #1121 – Fontus goes BANKRUPT!
Who saw it coming?, Fontus have filed for bankruptcy! The infamous “self-filling water bottle” that raised $340k on Indiegogo has gone bankrupt and delivered nothing. You ‘canna beat the laws of physics Captain! https://www.ksv.
EEVblog #1120 – How To Understand Polarised Light
Gav “The Mechatronics Guy” explains circular polarised light and demonstrates his physical laser cut models to help understand this concept in his quest to make a pixel mapped polarised light camera. How do 3D shutter glasses work? https://tinkerings.org/
EEVBlog #1119 – Designing a 1kV Isolated Oscilloscope
Bart Schroder from Cleverscope talks about the challenges in designing the world’s highest performance isolated oscilloscope. Measurement demo on a 500V MOSFET H-Bridge and how to accurately probe it. Then a teardown and walk through of the design of t...
EEVblog #1118 – Why Are Studio Monitors Noisy?
Why do many powered studio monitor speakers have a low level audible background noise? This is an issue with many big and popular brand monitors like KRK, Yamaha, JBL, Alesis and many others Time for some investigation on the KRK Rokit 6 studio monitor...
EEVblog #1117 – PCB Power Plane Capacitance
Are power planes in a 4 layer PCB any good as a capacitor? Can it work as one big bypass capacitor? A look at an discussion on PCB layer stackups, and some measurements on 4 and 8 layer PCB power planes with different prepreg thicknesses and how well t...
EEVBlog #1116 – The Capacitance Multiplier
Circuit building block time. The capacitance multiplier and how it gives almost negligible power supply ripple compared to a voltage regulator. Whiteboard theory and then some bench demonstrations and experiments.
EEVblog #1115 – Traps In Chips – And the 7660
Dave looks at some traps in chips and their modes of operation. In this case the TI LM2776, a look a the classic 7660 charge pump voltage inverter, and output ripple and ways to reduce it. Parametric searching,
EEVblog #1114 – NEW TS80 USB Soldering Iron Review
Review of the new 18W USB-C TS80 temperature controlled portable soldering iron. TLDR; Highly recommended, money well spent if you need a portable iron solution, but you need a QC3 battery pack.
EEVblog #1113 – Is a $5 USB Soldering Iron Useful?
Is a $5 8W USB soldering iron actually useful? Forum HERE