Here is a video:
Pretty self explanatory. Basically I had a model car lying around, so I drilled holes in it and put a circuit in the engine compartment. Looks nice! A23 battery cells are awesome.
Here is the circuit if you are wondering:
I tried a lower voltage with smaller transistors (e.g. 2n2222)... It didn't work. Still investigating it.
This isn't my first car. The predecessor to this car had headlights, tail-lights, and a speaker. It had a pedestal.
Now, it's burnt out by my attempts to add an amplifier.
Here is a terrible quality video of when it did work:
Some old stickers