LED flashing circuit using a 555 timer on a 12v system. An option for turn signals on a motorcycle or car.
EDIT: Previous layout was flawed. Pressing both buttons (L&R) would push too much current to LED's, blowing them all. Moved 4 330 ohm resistors (1 per pair of leds) from neg side to 2-160 ohm (1 per 4 leds) on positive lead. More stable and closer to led tolerances.