Electric fence with car bobin made for sheep.
Maximum input voltage is 15V (Limited by 555 timer chip, voltage on the chip is actually lower for 1v because of forward voltage drop of the diode but anyways keep within 15V because its not good to push components to their limits)
No input reverse polarity protection, if you reverse polarity on input 220uF capacitor will blow up and probably mosfets...
This includes all of the electronics for the go-karts used for http://evgrandprix.org/ races. This includes a general schematic for the go-kart itself, a schematic for the "PEM Box", and a previous design concept that has since become obsolete.