Again I built this as a request of a friend. If you go through my older posts you will see lots of clock projects of mine. This clock is for a school bus. Normally Bus power source is 24V DC ( When the motor is running it will be like 26VDC ).
So in here I have used simple voltage regulator with High Current power transistor to drop the voltage to 12V.
Enclosure is made by using plexi glass.