How to Make a A/B Box





Introduction: How to Make a A/B Box

Learn how to make a amp selector box.

Step 1: Tools and Supplies:

-Soldering iron w/ rosin core solder
-Drill w/ bits
-Phillips Screwdriver
-Electrical tape

1x Project Box
1x DPDT switch
3x 1/4 Mono jacks
and wire.

Step 2: Preparing the Box

*You should go ahead and plug in you soldering iron so it can heat up.

Take you project box (i used a plastic one from radio shack, if you use a metal one you'll need to insulate the inside of the box with electrical tape) and drill a hole on the lid of it.
Then, turn the box on its side and drill another hole for the 1/4 jack.
do the same to the other side.
then, drill a hole on the top of the box for the 3rd 1/4 jack.

Now your box is all ready.

Step 3: Wiring Time!

Now to start the wiring,
Follow this diagram.
*All you have to do is connect the Tip on output A jack to the 1st and 6th prong on the DPDT switch.
*Next, connect the tip of the Input jack to the 3rd prong on the DPDT switch.
*Then, connect the tip on the Output B jack to the 5th and 2nd prongs on the DPDT switch.
*Finally, connect the sleeve of Output A to the sleeve of the Input Jack, And then connect the input sleeve to the sleeve of the Output B jack and finally connect that to the 4th prong on the DPDT switch.

Now, the wirings done :)

Step 4: Finishing Up

Now its time to house the pedal.
After you do that, you can paint the pedal with acrillics or whatever else you want to pant it with.
(if youre going to spray paint it, do it before you house the box)
Then seal the box back up.
Ta-da, youre all done.

  • Time to try out your new A/B box.



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    I accidentally bought stereo jacks, would these work as well?

    For anyone reading this, yes they will work. Just ignore the "ring" connection.

    How do i stop the thumps i get when i switch?


    Adding a 1meg resistor across the input can help. The thump is typically caused by a DC offset between the guitar and the amp(s) and the resistor can help by directing that DC to ground. If it continues to be an issue, you may want to look at a buffered a/b switch. They're a little more complicated, but it will solve the problem.

    Not sure what is meant by 'thumps', but if box moves, you could install small, rubber feet. If it is the switch itself, perhaps trying a higher quality( more expensive) switch that are usually smoother action.

    To stop crackles and other weird sounds. Try using a 3pdt instead of a dpdt. That should stop any noise, when your switching.

    How would that make a difference?

    If I wanted to make a stereo version of this box with 2 inputs (L and R) and 4 outputs (LL and RR) would I simply duplicate the internals? Does anyone have a schematic? Would I still use a DPDT switch? Thanks!

    use a tpdt out you want less noise. On/ off/ on.

    If you use heat shrink tubing to cover each soldered connection, there is no need to cover whole inside of box with electrical tape. I also like to seal the box lid with a small amount of silicone on the edge.