Check the listing for details. DIY Audio - Stereo PreAmp PCB - Bare PCB + Support Documents, Not a Kit. Condition: New. Listed at 8.00 USD. This is a bare PCB (not a complete kit) that provides a compact, low power, low noise stereo preamplifier for DIY audio. Compatible with line level audio devices (mp3 players, CD, tape, AUX, etc.). Does not have RIAA equalization, so not for phono use. Built around the NE5532A low noise op amp. Specifications (built to schematic values): Voltage Gain range: 2.7 (8.7dB) to 7.3 (17.2dB)Input sensitivity: