Found in Precision Monolithics documentation from the 90's, this circuit equalizes octave signals determined by the capacitor values according to the table next to the diagram.
This circuit is from the 1993 Linear Technology Applications Databook. The component is uncommon...
Connected to the output of an audio amplifier or radio this circuit indicates the level of the...
Found in an Electronic Design from the 90's, this circuit supplies voltages according to the...