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Ha! Been a while since i was here... most peizo buffers for guitars/basses consist of a JFET transistor and a handful of other components. IIRC the one in the photos was inspired by this: http://www.scotthelmke.com/Mint-box-buffer.html . It's pretty simple to put together if you have any previous electronics experience, and if not don't be intimidated, it's pretty easy to learn basic soldering (There's almost definitely and instructable on it).
High Power LED Driver Circuits
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