Bar Graph LEDs  [ongoing]
In my quest to learn electronics I got myself some bar graph LED stacks which I hooked up to my Teensy in order to display data from my computer, for instance as a VU-meter. The nice ball of wire below was my first attempt. It worked very well and when my friend asked if I wanted in on a PCB order, I quickly designed one. Using shift registers, the boards can be chained together so that a bigger display can be built, an example would be a spectrograph. I managed to fit four boards per sheet, netting me 40 boards total. each board can drive six 10-LED bar graphs plus some extra status LEDs.

Analog Network Throughput Meters  [completed]
When testing my bar graph display I needed some data to display, so i wrote a program that repeatedly queried my router for its total data throughput. Finding some analog voltage meters online gave me the idea of repurposing them as network speedometers. I got some, opened them and changed their resistors to match my Teensy's 3.3V output.

Voltage Source for Computer Microphones  [ongoing]
This is a simple hack that makes it possible to plug in a regular headset mic(electret) into a prosumer sound card. They usually only provide 48V which isn't suitable for electrets that like 2-10V. The only components needed were a battery pack, a capacitor and a potentiometer.