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 circuit is from a 1967 General Electric SCR manual. The capacitors are polyester and the...
This oscillator for frequencies up to a few tens of kilohertz was found in a 1970s documentation. The...
This varicap-less modulator circuit was found in an Electronic Design from the 90's. The circuit...