Enabling ipv6 for DigitalOcean droplet

I’m currently using a web server by DigitalOcean and had some troubles getting the ipv6 support working. I noticed that it’s just not enough to simply enable ipv6 in the droplet setting. You can try a ping6 to your new ipv6 address … Continue reading

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Genealogy of Linux distributions

The Wikipedia page List of Linux Distributions contains a very informative graph of the evolution of basically all Linux distributions between 1992 and now. Below is a link to the SVG file of this graph. You can use your browser’s zoom function … Continue reading

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Displaying post excerpts in WordPress Twenty Ten theme

By default the WordPress Twenty Ten theme displays the full posts on the start page. To switch to the excerpt view all you need to do is a minor modification in the file wp-content/themes/twentyten/loop.php. Search for the block starting with … Continue reading

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Accuracy of UNI-T UT61E multimeter

This is a short report on the accuracy of my UNI-T UT61E multimeter. I will present errors along with uncertainty of the error measurement as discussed in my post on accuracy. DC voltage between 2.5V and 10V On eBay I … Continue reading

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Accuracy of measuring instruments

Suppose we want to determine the accuracy—or, equivalently, the error—of a measuring instrument, for example an Ohm meter. To this end we take a reference (also called standard) of which we know that it has a fixed and constant value of $x_0$. We then … Continue reading

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Converting maps for use in Garmin BaseCamp for Mac OS X

Garmin BaseCamp is a nice (and free!) software for viewing maps, managing geographic data, and planning routes. There are maps offered by Garmin and there are also free alternatives, usually based on the OpenStreetMap project. BaseCamp for Mac OS X uses a … Continue reading

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PicoScope Python Interface under Mac OS X: How to make it work

PicoTech has a Github repository with a Python interface to their PicoScope libraries. This allows direct access to their oscilloscopes via Python and that’s pretty nice if you want to do some advanced data analysis for example. However, I had … Continue reading

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LED light interference

I wanted to take a look at the ripple noise of my power supply, so I connected it to my oscilloscope in AC coupling mode and was a bit surprised by what I saw: The vertical scale here is just … Continue reading

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Book review: The Essential Guide to Digital Signal Processing

I have been reading the book The Essential Guide to Digital Signal Processing by Richard Lyons and Lee Fugal. This is a very basic, non-technical, and mathematics-free introduction to the fundamentals of digital signal processing: analog/digital signals, time/frequency domain, sampling rate, … Continue reading

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