We find the original circuit in a technical publication of 1978. Changing the components, such as 741 or more modern operational beyond the modifications it can be mounted today. The circuit separates severe acute and must be supplied through symmetrical power source 6 to 12 V. The circuit separation curve is given by the diagram. The input signal is a low impedance source and outputs should be applied to the inputs of audio amplifiers. Signal outputs must be made with shielded wires.
