A compact passive summing PCB designed to blend up to 4 microphone or balanced audio signals into a single output channel using precision 100-Ohm bus resistors for impedance matching.

Technical Specifications

• Circuit Type: Passive balanced resistor network (100R summing resistors per input)

• Inputs / Outputs: 4x balanced inputs to 1x balanced summed output

• Board Dimensions: 85 mm x 45 mm

Key Features

• Simple Passive Summing: Combines 4 mic/line signals without requiring active circuitry or external power supplies

• Impedance Balanced: Features 100-Ohm summing resistors on each input leg for balanced signal degradation and noise rejection

• Standard 3D Enclosure Fit: Shares the exact 85 mm x 45 mm footprint as the CAT to XLR extender, fitting Link Audio's free printable 3D cases on Printables

Included:

• 1x MICSUM Passive Summing Bare PCB

Product name: MIC SUM Product identifier:  PCBX012 Manufacturer: Link Audio Design, August-Bebel-Str.18, 08373 Remse, linkaudiodesign@gmail.com