This equalizer was found in the May 1978 issue of Radio Electronics magazine. The component values for the equalization networks are given next to the diagram.
This circuit was obtained from an old American documentation having a limited adjustment range....
The movement of the LEDs in this circuit mimics the back-and-forth movement of a pendulum, making it...
This circuit is from a 1967 documentation. It makes use of varicap and diode tunnel in addition to...