This configuration similar to many of this site was found in 1965 General Electric documentation. Modern equivalent transistors can be used. LEDs can be used.
We found this guitar effects circuit in a 1997 documentation. As the components used are still...
This circuit was suggested by Siliconix in a 1980s publication. The circuit uses components from the time...
This oscillator produces an audible signal on a piezoelectric transducer. The frequency is...