I'm building a custom jazzmaster with some pretty crazy schematics. I've got 2 p90s wired to a four way switch (fourth option is a kill switch) and a humbucker wired to a push-pull pot with coil tapping enabled. This way I get my favorite p90 tone, or If I need a bucker or a single coil, I can turn off the p90s and use my third pickup. Or blend it all together. Or whatever. Its gonna be awesome.
As I continue to pursue the perfect sound coming out of the output jack, I decided to wire in my two favorite pedals - an MXR carbon copy and an MXR 10-band eq. I managed to find both on Craigslist for cheap. Unfortunately, I forgot the 10-band EQ is an 18V pedal with no battery option, the carbon copy is a standard 9 volt.
This is foreign territory, I've never done this before. I think I can figure out how to hook up 2 9v wired in series to the 10-band eq and run it off of that. Ill put a switch on the side of the guitar by the strap pin for turning the pedal on and off so as to save battery, because it sucks it up pretty good (26 mAh).
My real question is this. Do I need to install a 3rd battery for the Carbon Copy: a 9v circuit? Or is there a way to wire it into the 18v circuit the other pedal is on? I've heard of people running 9v pedals off of 18v circuits and having great results, so I'd like to do that... but I think if I wire them in series on the same 18v circuit I wont have enough power for my second pedal?
Like I said, I don't really know what I'm doing. I'm really familiar with wiring pickups and stuff, not so much with wiring DC circuits. Please help and make sure I don't do something stupid!
I don't have an answer for the power question, but someone will be along soon. JohnH is the one to ask.
In addition to an On/Off switch, you may want to consider using a TRS jack to disconnect the power when no cord is plugged in, just as with a pedal. This may save your batteries if you forget to turn the switch off, or if it becomes inadvertently turned on, such as while carrying it in a case.