The newer Ford Mustangs have sequential brake and turn signal lights that really adds to the car. Unfortunately, my '09 Mustang does not have this, for a modest price of $130, I could buy a kit to give my car this great feature, but that is too much for something so simple. So I dug into this problem and designed an add-on board to give my car sequential lights.
The simplest electronic design would just be a timer to delay the next light from coming on. I could have (and probably should have) used the 556 dual timer to control the left and right, but I opted for what I had on hand, and that was the 555 timer.
A car's running voltage is around 14V and a brake light is around 27W. This is an amp load of around 1.9. This is too much for the maximum output for a 555 timer which is 200mA (0.2A). A PNP power transistor rated for this will work nicely to control this load.
27 Watts = 14 Volts x (1.9 Amps)
Below is the PCB I designed. Due to higher amp load and the fabrication restrictions I have, the traces are larger than normal.
I used the age old method of "toner transfer" to make this PCB. A very fast and easy was to make descent boards.
I even had a little fun and made the overlay for the top surface and transferred it over the same way the bottom would have bee transferred.