What is it?

Small pre-amp with priority inputs selection. Basically after setting 'On' pin 'LOW' signal connected to 'In1' & 'In2' have priority over 'In3' & 'In4' that way you can instantly override the current playing music/sound and tell important info via microphone.

Also it's possible to control it over microprocessor or development boards (ATTiny, Arduino, ESP, Teensy, STM32, Mbed...) then you can fully automate that feature and makes the firmware trigger some speaking info or tell evacuation plans in case of emergency.

Features:

• Microphone Pre-Amplifier with adjustable gain over SMD/TH Potentiometer
• Input signals can be from PC, MP3, Smartphone, Microprocessor

How to connect:

• In1 & In3 = (OUT/L)
• In2 & In4 = (OUT/R)
• In1 & In2 Priority inputs, overrides In3 & In4 IF 'On' is LOW
• In3 & In4 Regular inputs which goes to OUT/L & OUT/R IF 'On' is left floating
• Connect Priority Inputs to In1,In2 ... connect Regular Inputs to In3, In4 ... use Simple switch or MCU to Set 'On' Pin Low to override In3, In4 with In1, In2