Hi,

I'm trying to design a 2 pole low frequency shelving filter to boost the low frequencies in an audio circuit.

I've modeled this circuit and it models correctly, but I want to run it on a single supply op amp (LM324).

Should I connect R15 and R16 to 1/2 the supply voltage to make it work correctly?

Thanks,

Northy

This is the circuit that I'm playing with at the moment. It seems to work if I feed about 0.5V into V_Bias. I'm confused why it is only 0.5V though.

Thanks,
Northy