I built a microphone and a pre-amp this week. The microphone was supposed to have one piezo pickup in it. Just to see what happens I put two different sized piezos in and added an on-off-on switch so I could switch input between the two. There is a subtle difference, which is neat. Vocals are similar to the sound of an AM radio. I have a couple of songs I think this would be useful for. Now to get a stand to put this on. It's really sensitive so it would be best to have it on a stand and not touch it. The harmonica sounds good going through it, too.
I also built a pre-amp for my guitar and for the microphone. (I built the Brick House amp last year.) The guitar has a piezo pickup and it sounds pretty trashy plugged straight into the amp. The pre-amp really helps improve the sound. The pre-amp is also a necessity for the microphone above.
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