While sequence is happening a microphone is un-muted
Sequence :
1. Stu 1 pushes his momentary contact button at his desk.
2. Db Port 2 pin fires from the mixer to momentary contact.
3. Momentary relay closes RL/DPDT.
4. Master relay opens locking out other students.
5. Stu 1 relay closes, allowing for reset.
Student asks question or finishes statement.
6. Stu 1 pushes his momentary contact when finished at his desk.
7. RL/DPDT closes - RL 1 opens as well and "Master relay" closes.
Ready for sequence to begin for another Stu 1 or 2 or 3 or 4 Circuit board.
kv
Edit: Keep in mind the Microphones are 2 ceiling mount omni directional Mics.