/diy/ - Do It Yourself

A revision of the speaker simulator amplifier stage.
I followed your suggestion and re-designed the power supply as a split supply, and got rid of the +in cap.
I figured out how to recreate the bass response of the original, which I did by locating the gain control pot (simulated by R10 and R11) between ground and -in and wiring the input cap in series with a resistor to the "wiper". In retrospective, that seems like it should have been the obvious solution if we see how it's analogous to the jfet amp version.
Gain control response looks good but needs fine tuning of the resistors and capacitor. Maybe I'll use the equations I know to figure that out rather than sink hours fiddling about in ltspice.