MathJax Test

April 12, 2017

Apparently the mathjax CDN is closing at the end of April.

https://www.mathjax.org/cdn-shutting-down/

Our blog has a MathJax plugin that uses this CDN, so we will be affected (if anyone uses it).

This is a test to see if I can use it!

Simple shortcode version $$E=mc^2$$
Native format $$E=mc^2$$
Not getting far $$x^2$$.
Ah ha, need to select not default from the plugin configuration.

$$f(x)=x^2 = 4 \newline \rightarrow x=2$$

Update: Well it’s May now, and the above sort of still works. Not sure the last multiline thing ever did.

Unicode

December 3, 2015

Really just so I remember what works for me. There are plenty of pages Google will find you, and mostly their suggestions work ie

CTRL-SHIFT-u <followed by hex code of the char you want and RETURN>

For most X applications, eg pidgin, browsers, etc that works, but not emacs or the command line.

For emacs CTRL-X 8 RETURN <then hex code> RETURN

Embedded video test

September 11, 2015

Just seeing this this work. I just cut and paste the <video> markup from http://www.nutshell-videos.ed.ac.uk/barbara-webb-insect-robots/ into the “text” editor (rather than “Visual”) of WordPress.

I had to adjust the width to get it to fit in my odd, fixed width theme.

Alternatively from the visual editor I can do “Add Media” and select “Insert from URL” and then paste in the URL to the video, in this case http://podcast.is.ed.ac.uk:8080/Podcasts/cseresearch/webm/inf-barbara-webb.webm, and then I get the following:

July 28, 2014

Plugin reminder

July 8, 2013

This is really just a reminder that we’ve added a couple of plugins to blog.inf. Comment control and anti-spam. And that we need to do a proper blog post on the systems pages to tell people about them.

Neil

This is a test post from my iFriend account

February 19, 2013

iFriends can’t create new blogs, but they can be given permission to existing blogs.

Comments renabled, with anti-spam plugin also enabled.

PCB Reference Designation

March 9, 2011

While trying to fix my daughter’s Nintendo DS (which wasn’t a complete success, I managed to replace the slot1, it powers up and plays games, but now won’t charge 🙁 ). I wanted to know what component “F1” may be. While Googling I came across a cached web page from pcbwizards.com which was down, but seems back now. So this useful info doesn’t get lost, I’m reposting the cached info here.

 Reference Designation – Reference Designations are letter and number codes assigned to items that are part of an assembly. This ‘shorthand’ code allows components in a printed circuit board to be found easily while working on a board assembly or locating them and their complete descriptions in a Bill of Material or parts list. Standard Reference Designations for Electrical Equipment can be found published in ANSI Y32.2 1975/IEEE STD 315. Below is a partial list of the reference designations used in electronics. ﻿A Assembly AR Amplifier AT Attenuator; Isolator B Blower, Motor BR Bridge Rectifier BT Battery C Capacitor CB Circuit Breaker CP Coupler CR Crystal Rectifier (Diode) D Diode; Thyristor; Varacter DC Directional Coupler DP Diplexer DL Delay Line DS Display; LED Lamp E Terminal F Fuse FB Ferrite Bead FD Fiducial FL Filter G Generator, Oscillator HW Hardware HY Circulator J Jack Connector (Least Movable) JP Programming Jumper K Relay L Coil; Inductor LS Loud Speaker/Buzzer M Measuring equipment, Meter MH Mounting Hole MK Microphone P Plug Type Connector (Most Moveable) PS Power Supply Q Transistor R Resistor, or Potentiometer RN Resistor Network RT Thermistor S Switch T Transformer TB Terminal Block TC Thermocouple TP Test Point U Integrated Circuit or inseparable assembly V Electron Tube, Photoelectric Cell VR Voltage Regulator W Cable Transmission or Wire Jumper or Busbar X Socket Y Crystal, Oscillator