I have a piezo transducer from an old smoke alarm, and I want to stick it in my strat to use it as a contact mic. I'm thinking about gluing it to the block the strings go trough under the bridge, but I'm not sure exactly how to do it. I want it to pick up as much vibrations from the strings as possible.
so. What kind of glue do I use? What's the best spot to place it? Anything else I should be aware off?
The wiring in the guitar is a fairly standard Brian May wiring with master volume and tone. I'm thinking about using a SPDT-switch and connect the hot wire from the standard wiring to one side, the piezo to the other side and the center to the jack output. Would it be possible to use a on/on/on switch to have both piezo and pickups in parallell? Or would that cause any problems?
And what would happen if I put the SPDT switch before the volume and tone? That way I could use the volume and tone controls on the piezo as well, but my intuition tells me that's not a good idea. Both pots are 250k Audio taper, and there's a .47 cap in there.
He suggests better results if a preamp/buffer circuit is used when mixing piezo and magnetic pups. Also, look at how he added mass (in the form of coins) to the piezo when mounting it to the "tremolo" block.
Id suggest to wire up your piezo to a piece of shielded cord, run it into a stomp box as a buffer (eg any Boss pedal turned off), and just try the sound as you place it in various spots. Thats all I did, then followed my nose, and my ears, to end up with what I did.