The following schematic diagram is a HI-FI tone control circuit with high Z input. This is useful for controlling the HI-FI tone. To buffer op-amp controlled feedback type tone control circuit, this schematic applies 2N3684 JFET. The 2N3684 JFET is applied on this circuit because it has low noise features and offers the function of a high input impedance. Here is the schematic :

High Z Input Hi-Fi Tone Control Circuit Diagram

Hi-Fi Tone Control Circuit Diagram

[National Semiconductor Application Note]

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