For all your powering needs! Includes 20Ah of SLA batteries, a 5V 1A regulator plus a 220V converter. Everything in an sealed ammo box.
With a 50W LED module, a boost power supply and a LiPo battery.
Using an ATTiny microcontroller and a radio module, I built small trackers that could be included in model rockets, and then tracked down using a directional antenna. I actually used this in my Rocket Data Logger (see project page).
3D printed case, CNC milled face plate, battery salvaged from a laptop. Mainly just a pretext to play with the school's CNC mill.
Using a Raspberry Pi and some buttons, I made a V8 sound machine for a huge parade bicycle we made in a shape of a big Hummer. We actually won a prize with that!
Sugar and KNO3, but pretty much each and everyone blew up.
Goes back a looong time! I threw that together using some perfboards, TDA2003's, car speakers and a nice painted wooden box!
Nothing too special, Nixie PSUs, Flyback Drivers, ...
A small, automated supercapacitor charger, using a microcontroller to monitor the voltage, a car relay and an analog dial for setting the voltage. I may do a project page someday...
Based on that design: http://diyaudioprojects.com/Solid/12AU7-IRF510-LM317-Headamp/ I still have to make a nice case for it!