Piezo horn shutoff timer circuit 1.

Wayne has timer circuit bread boarded and it works great. Potentiometer allows precise adjustment.
Here horn is going off, Red LED illuminated switch is asking to be switched.
Notice duct tape over horn output, still way annoying.
Wayne selected a NTE955M over a 555 because he said it could handle relay coil control direct without more electronics.
Y10-06-11