Bass headphone amp schematic diagram.

The 100K* and 220K* resistors are used to control the input sensitivity and allow me to play my electric bass through the headphone amp with the volume controls at full without overdriving the amp. This way I can use the volume controls to have more control over the tone of the bass because of the interaction between the two bass pickups. Lowering the 220K resistor value to about 160K or less will decrease the input sensitivity a bit for the low and hi sensitivity settings of the headphone amplifier if it is being overdriven.

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