Below is a circuit I'm working on. It's a guitar input buffer featuring transformer isolation. The transformer I'm using is pretty expensive and should be fairly linear, but I decided to add a graphic equaliser to the circuit to correct any small non-linearities in the transformer.
In an ideal world there would be no 'volume' control, only 5 eq faders. But that would probably involve some form of compression, which I don't want. So instead I decided to add an overvoltage indicator which will flash when the output goes above 1V. The user can tweek the eq, and then attenuate the output to keep the volume under 1V using the indicator for guidance. Does that sound wise? Is it necessary?
I probably don't need the input cap and pop resistor on the eq input. But is it safe to remove the cap? Can I put the output of the transformer directly into the opamp?
The warning indicator opamp comparator output is normally at -9v but the output is grounded, meaning under normal conditions there's 9V across that LED arrangement. Is that ok?
Thank you in advance good people.
EDIT : I'm aware that both sides of the circuit share the same power supply. That's just for ease of simulation In fact, placing the EQ before the transformer gives exactly the same simulation response, and requires only one power source.