Guitar pickup wiring?
Answer:
You can simply operate your 2nd pickup between ground and the center tap of the two 9V batteries, understanding that this is going to cause the one battery to need replacement about twice as fast as the other. If that's not a problem for you, then it's by **far** the easiest solution. Sorry for the AWFUL attempt at an illustration (below) but the limitations of this site are pretty awful to start with.
What you get below is 18V for your existing unit, and 9V for your added one. The bottom battery will be the one that powers both, and will require replacement twice as often.
|-----existing-----|
+........|
9V......|
|.......|
|--------new-------|
+........|
9V......|
|.......|
|---------------------|
.
Use a resistor! You'll have to figure it out using the ohm's law! I hope this helps.
I would use a 9V regulator like http://www.superdroidrobots.com/shop/ite...
Or just buy the part alone that is the main element, LM7809. Be sure to use some electrolytic capacitors at the input and output. Look up the data sheet for recommendations. National semiconductor makes it, among others. Digikey sells them.
Since you have two nine volt batteries in series, I'd think you could just tap off the center to get nine volts. One possible problem is that unless there are diodes on the supply inputs of the pickups, there might be a path for leakage current when the pickups are "off"
Since the EMGs draw little current, a resistor divider could be a possibility, but it would increase the supply impedance dramatically which I think I would want to avoid on an audio application.
If you have room, you might consider just using a seperate battery for the 9v pickup, though that might complicate power switching.
Another option would be to run every thing on 9v, EMG does say at 18v "you'll have increased headroom and crisper transients" but how much, can you really hear it? they also say "This is especially useful for percussive/slap bass styles" is that how you play? if not, you may not need 18v
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