... ovens, computers, calculators, telephones, electronic and toys . One.Piezo Ceramic Element Applications1. For sound making:Clocks,Calculators,Telephones,Washing machines,Various ... pay full attention to avoid subjecting.5,Avoid excessive pulling lead wire because wire may break or soldering point may ... a soldering iron ,the optimum temperature for soldering a lead wire to a metal plate is 340°c±10°c ...