We found this circuit in an EDN from the 90s. The circuit is a voltage quadruplicator using operating equipment of the time. The output current is low.
We found this anti-theft circuit in a 90's English publication. The circuit uses common components...
Found in Popular Electronics this circuit will trigger a buzzer if the ignition key is removed...
A passive mixer with few components is that of the circuit shown, found in a 1982 documentation. As readers...