This circuit is from an American 1964 documentation. Transistors of the time are used, but modern equivalents can be employed.
This oscillator can be used to generate sinusoidal signals from less than 1 Hz to close to 20 kHz....
This small commercial radio for the MW band with germanium transistors was found in Japanese...
Found in Radio Electronics magazine, May 1987. It triggers a xenon lamp from an inductive sensor. The...