LM3886 Amplifier Boards (pair of PCBs, no parts)

• Minimalistic implementation of an LM3886 based audio power amplifier with only a few easy-to-solder through-hole parts.
• Unusual in configuring the LM3886 as a difference amplifier, not the commonly used non-inverting.
• Improved distortion performance, esp. at higher audio frequencies, due to the circuit topology and special routing of the PCB traces; see the THD+N graphs for detail.
• Same size, general layout, and mounting pattern as the boards previously offered by ChipAmp.com.
• One board per channel; two are required for a stereo amplifier.
• Bare boards only.
• Parts are not included and need to be obtained separately.
• Assembly is required.

References:

• Schematic (one board)
• Board size and Component Placement
• Part list (BOM) for a pair of boards
• Shared project at Mouser
• Discussion at diyAudio.com
• THD+N @ 1kHz: 1W 8ohm, 45W 8ohm
• THD+N vs. frequency: 1W 8ohm, 45W 8ohm
• Two tone (18kHz+19kHz 1:1) intermodulation: 1W 8ohm, 45W 8ohm