This circuit was found in a 1964 Electronic Design. The transistors are of the time, but can be employed as modern equivalents. The system is for car with contact breaker.
This amplifier was found in a 1957 Rayrtheon documentation. The circuit can be fitted with a BC558...
This buzzer with the 555 was suggested by a Popular Electronics from the 90s to be used as a...
This circuit with a component from the time was found in the Radio Electronics magazine of...