This circuit was obtained in an American documentation from the 80's. The transistors can be equivalent to those indicated and the crystal can reach a few tens of megahertz.
This circuit, suggested by Sylvania in a 1956 publication, serves as an experimental stage for a...
Available at Mouser Electronics this component of Diodes Incorporated consists of a voltage...
This 3-channel sequential circuit, but which can be expanded further, uses triacs to drive...