This circuit makes use of a stroboscopic tube, a component that no longer exists today. The circuit is from the 70's and can be adapted to use mains voltage.
This circuit is from a Radio Electronics from August 1952. Types of the time are used, the first...
In the figure we have a 9V source using a 5V 7805 regulator. The circuit is from an American...
This Pierce oscillator was found in American documentation from the 1980s. Transistors support modern...