So it should be R7 -> C6 for it to be a LPF (like normal)?JiM wrote:No, they have exactly the same behaviour as C1 and R5. Apart from the leds, both opamp stages look similar !
The "inverted" charateristics that i was talking about is only valid for the freeback circuitry : it's really re-injecting the signal from the output to the inverting input of the opamp, right-to-left in your schematic.
It not about the signal being inverted, but about some inverted signal being fed to the opamp.
Also, would R7 work with the drive pot to set the gain, or is the drive pot all on it's own?