Hey, I've got two Piezo Buzzers (http://kls.chinese-suppliers.com/imagefile/11067300733514-.jpg) which pick up the sound of my bass rather nicely, and because I'm building a new bridge anyway, I'm thinking of building the piezo into it. The mechanical problems will be overcome, but the output of the buzzers is way lower than that of my pups (2 low quality soapbars). I guess I'll have to build a preamp if I want the output to be of a decent volume. I found some circuits, but I haven't got a Idea of what will work an how many W it should be etc. Could someone comment on these circuits or send me in the right direction? Many thanks!