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Discussion in 'Beginners/FAQ' started by Gmork, Nov 14, 2018.
Cant find info anywhere. Seems like most newer preamp style pedals can use at least 9v or 12v.
Direct from Revv's site:
"center negative 9v external power supply only"
Can you run something else? Probably, but it doesn't seem to be designed to.
That’s a firm, maybe.
Depends on the voltage ratings of the parts inside it.
If you can get inside one, write down the model numbers of the op amps and/or transistors in it and look up the ‘absolute maximum’ voltage rating in the data sheets. Most of these new preamp and distortion pedals tend to be TL072-based, and those TL0xx op amps can take up to 36 volts. but check them anyway as it takes less time to look up a data sheet than to replace a burnt out part.
The second consideration is the electrolytic capacitors. They need to be rated a bit higher than the voltage you want to apply. For example if it has 12 volt electrolytic caps, I wouldn’t give it more than 9 volts. I would want 25 volt caps minimum if I was going to feed it 18 volts.
Not all the electrolytic caps see the full supply voltage but you’d need to trace the circuit or have a schematic to know which are which.
I don’t know what is inside the G3 though, so for all I know it could have a charge pump in it, internally converting that 9 volts into 18 or more volts. Many pedals these days have charge pumps. Don’t give a charge pump more than it’s rated for, they’re temperamental and tend to die instantly when you exceed the voltage.
9v it is.
Seems like a quick email best sent to Revv themselves?
Yep thats what i did and got a reply just a little while ago. 9v only.
I'm thanking mnemonic for his detailed reply.
I'll be it has a charge-pump circuit in it already increasing the voltage.