This oscillator with emitter follower was found in an American documentation from the 80's. The circuit generates 100 MHz signals and the transistors admit modern equivalents.
A frequency of up to a few kilohertz can be obtained with this oscillator. The frequency is given...
This well-known two-transistor oscillator circuit was found in the April 1964 Radio Electronics magazine....
This relay circuit is intended for reversing small DC motors. The circuit is from an old...