This circuit was found in a 90s Popular Electronics. The circuit operates in the range determined by L1. The integrated circuit used is uncommon today.
We found this simple roulette with the 4017 in a 1995 documentation. The circuit is of a very...
This two-transistor circuit was found in the 1990 special issue of Radio Electronics Experimenter...
This other circuit from the June 1968 Radio Electronics magazine has a driver transistor and a...