We found this circuit in an 80's Electronic Design. It makes use of couplers of the time that can be replaced with equivalents.
Found in the October 1992 Radio Electronics magazine, this oscillator is controlled by switch S1....
This variation of configuration that is common on our site was found in a 1980s documentation. LEDs can...
This circuit was obtained from a European magazine of the 1990s. The integrated circuit used is...