This is the bare PCB of a guitar pre-amplifier. The pre-amplifier integrates 3-band tone control, distortion control and emphasizing control on one board. The schematic is included here for guitar lovers to understand the functions and operation. Supply voltage : 14VAC x 2 or 15VAC x 2 0.5A Dimension : 295mm x 56mm This is one piece of bare PCB for a guitar pre-amplifier.We provide schematic as in the listing here to buyers by email. We do air shipping worldwide at US$7.00.