overvoltage protection for effect pedal?

[waspclothes]

I can't seem to find any tried-and-tested circuits for overvoltage protection on a guitar pedal?

I made a little design that uses a rail-to-rail opamp that is only rated for +15V and I know a lot of pedalboard power supplies have +18VDC outputs.

Any circuit recommendations for an overvoltage protection circuit?

[Enzo]

WHAT op amp? And are we sure that 15v rating is not for each power supply? SO +15 and -15, for 30v ACROSS the chip.

[waspclothes]

WHAT op amp? And are we sure that 15v rating is not for each power supply? SO +15 and -15, for 30v ACROSS the chip.

+16V actually. TLV2372. I'm only using it because I require rail-to-rail input and output. Not even running audio through it, so it's not super important. Maybe its' easier to find a rail to rail opamp (that's actually in stock) that can take at least 18V and then not worry about overvoltage situations?

[Mick Bailey]

A Zener across the supply is easy - just like Boss pedals. They use 11v/1w. A series resistor would be a good idea.