... , MMA, PS, PE, PVC, Nylon, EV/AEV material etc. intelligent computer type ultrasonic welding machine Scope of Products: 1.Small ... automatic frequency search first design adjacent frequency.4.voltage protection system( supply voltage range of 180V-260V); in the automatic ... system, depending on the pressure change and fluctuation of voltage automatic compensation.10.the PET sound tube power amplifier. ...