Here goes all the stuff, that does not fit into one of the other categories.

Running LEDs

A running LED circuit, where multiple LEDs light up simultanously.

R/C-Plane altitude recorder

A circuit to record the altidude in an R/C-plane on a SD-Card.

Stripboard layout with Inkscape (93 kB)

This is an SVG-file to plan the position of electronic components on a stripboard with Inkscape. With the correct grid settings this works quite nicely. Not much of a component library there, just some basic components. An example of use can be found here.