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.
The output current of this circuit reaches 12 mA. The zener diode determines the output voltage. The...
Found in Maxim's documentation from the 90's, this circuit uses an integrated from the time...
Found in a 1980s documentation, this circuit makes use of components from that time. Modern...