The mains supply is DC voltage of about 9 V after full-wave rectification and capacitance C filtering of the diodes VD1 and VD2. IC1 is the amplifier comparator in the line, IC2 is the hysteresis comparator, the bidirectional thyristor VS is the electronic control switch of the heater, RT is the heat sensor, the temperature control point is adjusted by RP, and the indicator light is used as the voltage regulator tube. .8 V reference voltage, HR2 as heating heating indicator.
RT has a large resistance at low temperatures and a small resistance at artemisia temperature. When the ambient temperature is lower than the set temperature, the voltage at pin 2 of IC1 is higher than the voltage at pin 3, and pin 6 outputs a low level. Therefore, the 3 pin of IC2 outputs a high level, so that HR2 emits an indication, and at the same time, VS is turned on, and the heater PH is energized to heat up. When the temperature environment of RT is higher than the set temperature value, the voltage of pin 2 of IC1 is lower than the voltage of pin 3.
Then the 6 pin of IC1 outputs a high level, the output of IC2 is low level, HR2 is extinguished, VS is turned off, the heater is powered off, heating is stopped, and the temperature is controlled within a predetermined temperature.
The insulation material should be filled in the cabinet, and the heater should be installed in the lower half of the incubator, so that the temperature in the box is relatively balanced, and the RT should be placed in the middle of the incubator to facilitate the true reflection of the temperature of the egg box.
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