For those of you who have looked this up in the past, I tried building an acoustic stompbox out of things I had lying around the house. It worked out pretty good using plywood, screws, rubber bands, and an old speaker, but it wasn’t very loud through my amplifier. I really had to turn it up and my little acoustic amp makes a lot of noise.
As you have also hopefully read, I recently took the cheap Olympia OP-2 by Tacoma parlor acoustic guitar and turned it into an electric/acoustic guitar using a piezo transducer from radio shack. For $2.19, I figured I could add a piezo transducer to my acoustic stomp box and hopefully it would be a bit louder and wouldn’t require so much buzzy amplification.
I also purchased a cutco knife case for a buck or two at a local thirft store. The top is too thin for the screws I used on the plywood acoustic stompbox, so I used double sided tape. I first tested the box with the old speaker to see if it would still work…and it did!
Then I added the piezo transducer and it worked even better! But two is better than one, so I wired them both up, installed the jack (which took a little drilling and carving since the sides were thicker than the top and bottom of the box), and now have two “pickups” in the acoustic stompbox.
My only complaint is that the box is just a little too small for my foot, so it is a bit awkward to get a good stomp by merely angling my foot up. If I lift my foot up completely off and then “stomp” down, it sounds great!