We found this circuit in a Popular Electronics from the 90s. Transistors can be modern equivalents. Observe the high supply voltage.
A pulse triggers this 800 Hz horn for a time determined by capacitor C1. Powered by 5 V the...
This circuit was found in an American documentation from the 90s. It consists of an optical memory...
This converter can be used to send information remotely from linear transducers, converting voltages...