The heat source controlling circuit of the heating system includes at least an oscillating circuit, a transistor and {HEAD ~ a diode} for controlling {TAIL ~ the heating frequency} of the heating mechanism 
for controlling
The heat source controlling circuit of the heating system includes at least an oscillating circuit , a transistor and { HEAD ~ a diode } for controlling { TAIL ~ the heating frequency } of the heating mechanism
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH