This circuit has a very low operating current. The frequency of blinks is determined by C1 which can be changed over a wide range of values. The supply need not be symmetrical and can have voltages from 9 to 12 V.

This circuit has a very low operating current. The frequency of blinks is determined by C1 which can be changed over a wide range of values. The supply need not be symmetrical and can have voltages from 9 to 12 V.