John's blog

Talking about technology (mostly)

This is a note for Future John. The practice problems and associated documentation are here: Thevenin & Norton practice problems.

I don’t have a wood shop at the moment, but I hope one day I do.

This is a log-log plot of the size and mass of various types of thing in the universe.

I love seeing how things are made.

There are some interesting circuits in here.

You can buy the kit here: Space Drop Solder Kit and the build guide is here: Space Drop Handheld Game.

This guy has made his own motor! Looking forward to part 2!

Inside this old phone is a tiny Toshiba 4GB hard drive.

lol, this is fun. This guy made RAM for his relay computer using capacitors!

An interesting look into the optical system in a mouse.