Egg warming circuit

This type of poultry egg incubation thermostat uses a temperature sensor integrated circuit (PC616). The temperature adjustment range is 10-60℃. The circuit is simple and
    easy to use.
  Here's how it works.
  Turn on the power and close the power switch Sl. The secondary output of transformer T is about 12V alternating current, which is rectified by bridge rectifier UR, filtered by capacitor C
, and stabilized by Zener diode VS to power the relay. At the same time, the DC power supply supplies power to the temperature control circuit after flowing through the resistor Ri.
    Resistor R,., potentiometer RP1, and resistor Rs form a voltage dividing circuit to convert the temperature signal into a voltage signal. The set temperature of the thermostat can be adjusted by changing the potentiometer RP1
. When the power is turned on. Since the temperature in the thermostatic box is lower than the set temperature, the OUT terminal of the temperature sensor integrated block IC1 outputs a high level
, the transistor VT1 is turned on, the relay K is powered on, and the normally open contact K is closed. The electric heating tube EH is powered and heated. As the temperature in the thermostatic box rises slowly and reaches the set temperature, the OUT terminal of 1C outputs a low level, VT1 is cut off, K loses power and releases IK, and EH is turned off to stop heating. The temperature in the thermostatic box drops, the OUT terminal of Ic outputs a high level, and EH is heated again. When the temperature inside the box rises and reaches the set temperature. The OUT terminal of 1C outputs low level , and this cycle continues. Keep the temperature in the incubator at the set incubation constant temperature.