Black Box

 
Let's showel out some good stuff. Onboard guitar buffer/preamp with 12 db adjustable gain.

BOM, Schematic and PCB-layout here.

With TL072 op-amp and 9 Volts supply maximum Vp-p is 3.2 Volts (*Update. Erm... make that 6 Volts. my signal generators battery was almost dead, and I got bogus readings.*) For higher Vp-p use other op-amp or higher supply voltage.
Because of ground plane this board requires some serious soldering skills and good eyes. So, if  it doesn't work, you have
"bridge(s)" somewhere.











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