Output Overvoltage Protection in Circuits with boosted supply

[teela]

Why is it, that the circuits using a non 9V power supply dont have any protection diodes at their outputs? (at least from what ive seen) I dont think an op amp of a pedal later in the signal chainrunning on 9V would like a signal with 18V or +-9V at its inputs... Neither do I think the internal ESD diodes are designed for that. Most op amps can only handle about 2V (it depends ofc, especially on the negative rail) over the supply voltage at their inputs. Do effects running on higher voltages simply no have such a large output?

[FiveseveN]

Do effects running on higher voltages simply no have such a large output?

Bingo!
Most also have a volume control and even fixed attenuation to bring the signal to a reasonable range.

[drdn0]

Why is it, that the circuits using a non 9V power supply dont have any protection diodes at their outputs? (at least from what ive seen) I dont think an op amp of a pedal later in the signal chainrunning on 9V would like a signal with 18V or +-9V at its inputs... Neither do I think the internal ESD diodes are designed for that. Most op amps can only handle about 2V (it depends ofc, especially on the negative rail) over the supply voltage at their inputs. Do effects running on higher voltages simply no have such a large output?

Aside from the fact you'll likely never have the full rail voltage as an AC waveform (volume controls and whatnot), it's not likely seeing a 9v signal will make anything next in the chain instantly explode - it will just distort