Some sound card audio jacks can now inform recent Windows OS's that an audio device is plugged in. Anyone know how it does this? I'm thinking it uses some kind of voltage compara …

I've recently bought an Olimx ARM-USB-OCD JTAG programmer but I've had difficulty getting it to work. My primary system is linux, but I've tested it in window with no luck there …

How do I detect light with an LED?

I was wondering if you can use an inductive proximity sensor to detect aluminum or if a capacitive sensor must be used? I wasn't sure if inductive sensors were reserved for ferrous …