Builds
Transistor as a switch: build a NOT gate with one transistor
A transistor works as a switch with no moving parts. A small current into its base (the control leg) switches on a bigger current between ...
Posts
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Explains
How does a rotary encoder work? Quadrature made simple
A rotary encoder like the one in a volume knob reports steps, not where it points. Inside, two springy metal contacts, A and B, rub on a ...
System Design
How NGINX Works: Reverse Proxy, Event Loop and Config
NGINX (say "engine x") is a web server that sits in front of your app. It answers simple requests itself, such as images and CSS...
Physics
Which SUVAT equation to use? The 3 equations of motion
To pick a SUVAT equation, list s, u, v, a and t and fill in the three you know. The letter you don't know and don't need picks it:...