This circuit, for frequencies up to 100 kHz, was found in American documentation from 1970. The circuit can serve as a reference for projects with modern equivalent components.
This well-crafted speed game setup for two competitors was found in a 1998 Poptronics. The circuit...
This circuit was found in an Elektor from the 90s. The integrated circuit is uncommon today. This...
This 1 kHz oscillator uses a Norton LM3900 operating system. The frequency depends on C1 and R1...