Home-rolled battery pack for preamp

Pickups, wiring schemes, switch techniques and onboard active electronics for guitars and basses
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DieterVDW
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Joined: 06 Jan 2013, 19:50

Post by DieterVDW »

Hi,

I have a Yamaha BB425X electric bass. I like it mostly, but sometimes I find it too bassy.
So I ordered a 2-band preamp from ToneMonster and I built it in my bass.

However, with all the pots in the cavity I had no more room left for the battery.
So I rolled my own battery pack using some painters tape, 2 wires and 3 3V CR2032 button cells.
I found that a pretty nifty solution!
Capacity should be ~500mAh, not that much less than a 9V brick. So lifetime shouldn't be a problem.

I was wondering though if that makes a difference otherwise?
I'm guessing 9V is 9V, and especially for a low-current application like this I see no problems?
Or is there some strange possible side-effect I am overlooking here?

Also, I'm wondering if the glue or the tape itself might allow some current to flow and cause the batteries to go flat.
On second thought I had better put some extra insulation in to shield one of the poles from the tape, forgot though ...

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apollomusicservice
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Post by apollomusicservice »

On output jack you should disconnect switch terminal from earth terminal.
Earth tip connect to ground of pots (white wire) and minus pole battery connect
to switch terminal on output jack, thus save battery life. No other differences
for that preamp according how you get 9 Volts.

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