... manufacturers and suppliers,Website:http://www.mglasermachine.com, equipped with professional factory we are always able to produce low price ... Short circuit (or “3” “4” short circuit, “2” “4” connect with switch), center of the potentiometer connected “5”, other two ends are ... respectively connected with “4” and “6”);7)High level control switch “1” and “6” connected, “3” ...