This physical line servo control uses components that are not currently common. The circuit is from an 80's documentation and is powered by a voltage according to the servo.
With this circuit it is possible to use a DC buzzer (not a transducer) as an extension of the...
This circuit is from a Radio Electronics from April 1964. The circuit uses power transistors of...
This converter uses an SG1524 integrated circuit, which is uncommon nowadays. The circuit is from...