In this episode Shahriar explores the world of Delta-Sigma modulators with emphasis on a Delta-Sigma Analog to Digital Converter (ADC). The basic concepts of analog to digital conversion is presented, particularly with respect to quantization noise spectral shape and power density. Next, oversampling ADCs are presented to demonstrate the possibility of increasing SQNR (ENOB) through manipulation of quantization noise spectrum.
Due to the practical limitations of high oversampling ratios, delta-sigma modulations is explored. The principle operation behind delta-sigma ADCs is presented with detailed explanation on noise shaping, filtering and decimation. The signal and noise transfer functions for a 1st order and 2nd order delta-sigma ADC are derived. Finally, as a practical example, a 2nd order delta-sigma ADC based on a 1-bit quantizer is presented. The ADC uses two Miller integrator op-amps, one comparator and a D-Type flip-flop. The complete measurement of this delta-sigma ADC is presented. The impact of over sampling ration, op-amp linearity and input signal bandwidth is presented. The slides for this video can be downloaded from The Signal Path website.
Theory, Design and Characterization of Delta-Sigma Analog to Digital Converters - [Link]
by limpkin @ limpkin.fr:
During the month of July I was visiting Beijing and had an extra 10 days to spare. What to do? Well it took me less than a few minutes to decide to go the wonderful city that is Shenzhen…
Video Series – Touring Factories in Shenzhen - [Link]
Did you know you can use your frequency counter to detect gravity? You’ve likely done it before and you didn’t even know it!
Dave demonstrates the phenomenon of 2g-tipover on quartz crystal oscillators in an Agilent 53131A frequency counter.
EEVblog #646 – Gravity Detection Using A Frequency Counter! - [Link]
Touring factories in Shenzhen: Visiting an assembly line, Seeedstudio and a CNC shop
Shenzhen is the geek’s paradise and can be described as an awesome concentration of very different companies, all within an hour cab ride from your hotel. If you ever go there, I highly recommend you to have a look at Ian’s article to get practical informations. Shenzhen is located in the south of China, right next to the border with Hong Kong. I therefore decided to spend my first day in this former British colony to buy myself a nice camera to bring back cool videos of my adventures.
Touring in Shenzhen video series from Limpkin - [Link]
Dave shows some techniques on how to build and mount usable PCB based front panels user interfaces with LCD displays and push buttons and capacitive touch buttons onto small cheap extruded aluminium enclosures.
EEVblog #644 – How To Design Front Panels On Extruded Enclosures - [Link]
Here’s a short interview from RS featuring Raspberry Pi Founder, Eben Upton, discussing the latest Raspberry Pi Model B+, shared by RSWWWChannel:
We caught up with Raspberry Pi founder Eben Upton for an exclusive interview on the differences between Model B and the new Raspberry Pi Model, B+. He talks us through all the changes we can expect to see and highlights the improvements made in the newer Model.
Raspberry Pi Founder, Eben Upton, talks the latest Raspberry Pi Model B+ - [Link]
kurtscottage @ youtube.com writes:
In this video I’m showing you how I built some solar panels from start to finish I tried to make it as detailed as possible. These panels cost me very little to build and are fun projects for everyone. This is just one way of doing this there are lot’s of others doing this and good videos out there. Presently I’m using my panels at a job site where there is no electricity available they are running my RV off the grid. These panels are not encapsulated but they work well and low cost not for on roof installation best to be close to ground for inspection.
Homemade Solar Panels Diy tutorial - [Link]
Scheme-It is an online schematic and diagramming tool that allows anyone to design and share electronic circuit diagrams. Walk through how to create your own diagrams with the electronic symbol library and how to export and share your drawings.
Scheme-It – Online schematic and diagramming tool - [Link]
mjlorton @ youtube.com writes: In this video I go through the components that are part of a solar power solution. I explain the differences between On-grid vs. off grid.
How to Solar Power Your Home / House #1 – On Grid vs Off Grid - [Link]
Dave grabs a few junkbox parts and builds a useful constant current load for switch mode power supply, battery testing, and other applications.
EEVblog #102 – DIY Constant Current Dummy Load for Power Supply and Battery Testing - [Link]