So I’m working on building an arduino guitar-pedal. And I’ve got the output working (from Instructables).
Now the same author have made a tutorial for an audio input for the arduino (offsetting the signal so there is no negative signal going into the arduino) Now in this tutorial it says that you need 2 9-volt batteries in series (the middle to ground) to generate the positive and negative 9 volts for an op amp.
My problem is I really don’t want to use 3 of my power-suppy outtakes to power a single pedal.
I’ve read something about voltage splitters, and it seems that maybe they could bring me down to 2 outtakes…
Can anyone point in the right direction? Or just tell me once and for all that it cannot be done?
boiled down: I got 9 volts coming in, and I need power for the arduino and +/- 4.5 volt for an op amp.
Thanks in advance for your help.