By means of the current limiting resistor 424 and {HEAD ~ the diode} 425 for {TAIL ~ half wave rectification}, the oscillating signal is limited to positive half wave for biasing the base of the transistor 422 and creating a current ice for heating the heating mechanism 41 
By means of the current limiting resistor 424 and { HEAD ~ the diode } 425 for { TAIL ~ half wave rectification } , the oscillating signal is limited to positive half wave for biasing the base of the transistor 422 and creating a current ice for heating the heating mechanism 41
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH