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.
This article is from the Italian magazine Sperimentare number 11 of 1975. It can be assembled with...
The circuit shown is from a 1972 publication. Transistors can be current types like 2N2222. The...
This adjustable oscillator has the traditional configuration already presented in other articles. The...