The NotaBotYet GPIO Relay Board for Axia can be used to control tally lights on popular mic arms.  Most of these types of mic arms have a ring of multiple LEDS that are used to indicate which mic is live on the air.  These LEDs at 12 volts typically draw 30-40 milliamps of current, and … Continue reading Application Note: Lighting Mic Arm Tally Rings with Axia GPIO