Piggyaxe 555 alternating flasher kit piggyaxe p a kit of parts to make a simple and reliable alternating flasher circuit based around possibly the most famous chip of all the 555 timer p p in this circuit it is used as an astable oscillator and directly drives two leds flashing them alternately p p the kit is quick to build even by absolute beginners it provides a quick way to add some electronic interest to a variety of projects from aliens with flashing eyes through to ed