9volt and 18volt wiring at the same time
Can someone draw me a diagram of how to wire active pickups at 9 volts and also wire a preamp at 18 volts using only 2 batteries
Don't think it's feasible..
I could ...
But NEVER use this switch while the bass amp is on!
The switching pop might cause damage to your amp (and/or speakers).
Why would you want to do that?
Since using the ring terminal of the jack to switch the batteries would result in a finite resistance across the battery that sits 9V above the ground potential, since the "tap" between batteries will not be switched; it would not be a good idea to use a standard wiring scheme.
As I see it, there are two options.
1. You can run the bass at 18V and use an LM7809 or LM317T regulator chip to create a 9V or 9.6V (Fresh battery voltage.) power supply from the 18V. You may also use one of the smaller 100mA regulator chips in the TO-92 package, if TO-220 is too large in the cavity for whatever reason. The disadvantage to this may be the excess current draw required for the regulator chip, but it should still be low current. Thermal dissipation is not significant, to require heatsinking, so don't worry about that.
2. You can switch both batteries with a DPDT mini toggle. The disadvantage of this is the need for a dedicated power switch, and the loud popping that will occur when switching.
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