Blinky is not picky
No, I'm not picky. I'm not rude. Why, I'll eat any kind of food. These are the first lines of a poem by Kenn Nesbitt and it applies particularly well to this Elektor.Labs project. The small circuit is intended for modelling applications that require blinking lights will eat anything from 6 to 30 volts AC and from 9 to 42 volts DC.
Based on the over-classic timer chip 555, but in a CMOS version, the little circuit even has two controls, one for the blink rate and one for the duty cycle.