disc is screened and there are no shorts. I have fitted a second disc that I made up just to be sure the disc was not faulty, but sound is still totally distorted. For testing I have the disc taped to a silver cup that resonates like a bell but even the most gentle striking of the object produces sounds akin to, well… distorted farts and high pitched squeals. To give you some background to my project I’ve been working with piezos for quite a while using an unbalanced buffer circuit from a book by Nick Collins. The sound produced is very good, but unfortunately the white noise level is unacceptably high, so I’ve been researching a high gain low noise alternative which led me to your product. The eventual application is to attach to a large sculpture object made from a wood frame and fine elastics that pass over a sort of bridge such as you would have in a guitar, but the sound levels produced acoustically are very low compared to a musical instrument, hence the need for a lot of amplification. I very much appreciate any further help you can give. I notice in an earlier topic the resistor R8 needed a different value?? Could my problem be anything to do with that?