I am seeking a PCB designer to create a PCB that converts stereo input to mono amplified audio output. Additionally, I require a 3D model of the PCB.

I am seeking a PCB designer to create a small PCB (less than 2x2 inches) that converts stereo input to mono amplified audio output. Additionally, I require a 3D model of the PCB that is compatible with specific 3D modeling software.

Requirements:
- PCB design expertise
- Experience in converting stereo input to mono amplified audio output
- Ability to create a small-sized PCB
- Proficiency in creating 3D models compatible with specific 3D modeling software