This decorative circuit was found in the July 1994 issue of Electronics Now magazine. It makes LEDs blink in a face-shaped allegory. The frequencies are given by the capacitors in the oscillators.
November 2016 - Already available from Mouser Electronics on Texas Instruments' new DS280BR820...
This circuit is from the 80's component manual itself, but can be applied to more modern...
We found this circuit in the June 1992 issue of Radio Electronics magazine. The sensor is a common...