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23 Aug 2014

by mjlorton:

In this series of video I want to take a look at what the industry has to offer in terms of DC Power and Energy Measurement Meters / Analyzers (Analysers). There seems to be a distinct lack of affordable instrumentation in this area.

DC Power and Energy Measurement Meters – Pt 1 - [Link]

18 Aug 2014

This video describes how a classic double-balanced diode-ring mixer operates. Very basic mixer theory is quickly reviewed, which describes how the sum and difference of the LO (local oscillator) and RF (Radio Frequency) inputs are generated at the IF (intermediate frequency) output. It is also noted that the sum and differences of the harmonics of the LO and RF are also present at the IF output. Math waveforms on the oscilloscope are used to illustrate the operation of the mixer, and the actual waveforms from the mixer are compared to the math waveforms and the differences are discussed. A detailed description of the operation of the mixer is presented, including the switching action of the diodes. Finally, the frequency components are are expected from the mixer are shown on the spectrum analyzer.

How a Diode Ring Mixer works | Mixer operation theory and measurement - [Link]

18 Aug 2014

Dave explains a big trap in high frequency measurement with your oscilloscope. Based on a viewer request, Dave demonstrates how to incorrectly and then correctly measure the signal output level over frequency of your function generator using your oscilloscope. Some whiteboard transmission line theory is thrown in as well.

EEVblog #652 – Oscilloscope & Function Generator Measurement Trap - [Link]

13 Aug 2014

TheSignalPathBlog writes:

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]


4 Aug 2014

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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]

4 Aug 2014

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]

2 Aug 2014

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.

[via]

Touring in Shenzhen video series from Limpkin - [Link]

26 Jul 2014

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]

22 Jul 2014

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.

[via]

Raspberry Pi Founder, Eben Upton, talks the latest Raspberry Pi Model B+ - [Link]

15 Jul 2014

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]



 
 
 

 

 

 

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