Tools
Remove VAT from a price tool (with code for your website)
Remove VAT from any price at any rate with this tool, and copy the commented HTML and JavaScript for your own website.
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Tools
Convert Celsius to Fahrenheit and Fahrenheit to Celsius
Convert between Celsius and Fahrenheit with this small tool, and copy the HTML and JavaScript to run it on your own site.
Technology
Top Ten Essential Windows Programs
Ten programs I install on every Windows PC, from an office suite and a browser to Notepad++ and FileZilla, with free alternatives where they exist.
Technology
Top Ten Windows Keyboard Shortcuts
Ten Windows keyboard shortcuts worth learning, from switching windows and showing the desktop to locking the PC and opening Task Manager.
Tools
How to remove VAT from a price using a calculator.
Take VAT off a price on any calculator or in your head: divide by 1.2 for the UK rate, with the reasoning and a worked example.
Electronics
Charging Lithium Cells with a Bench Power Supply
How to charge a lithium cell safely from a bench power supply: read the datasheet, set the voltage and current, and know when to stop.
Electronics
555 timer astable: flashing an LED on a breadboard
Wire a 555 timer in astable mode to flash an LED, with the frequency and duty cycle calculated for the parts used and a diagram to copy.
Electronics
Make a simple LED circuit on a breadboard. (Maths included)
Build a one-LED circuit on a breadboard and use Ohm's law to pick the right resistor, with the maths worked through step by step.
Electronics
Capacitors: What They Are and How They Work
What a capacitor is, how it stores energy, the main types and uses, and how to work out total capacitance in series and in parallel.
Programming
“Hello, world” Way too much information
The story behind the first program every coder writes, and Hello, World in sixteen languages from Python to x86 assembly.