Basic circuit for bass preamp
Use the sliders to change circuit values and view result in the plot below. The button switches the circuit input.
Version 3, December 2014
How it works
For the non-inverting op amp circuit shown:
Gain (dB) = 20.log10 [ 1 + ( [R2 + XC2//R3 ] / [R1 + XC1 ] )],
XC2//R3 = ( XC2 x R3 ) / ( XC2 + R3 ).
and XC = 1 / 2πfC.