This paper aimed at designing and evaluating the performance of a circuit that can be used in
an egg incubator, capable of controlling and monitoring of the required temperature automatically within
the range of 32 to 39±C in a chamber using nonlinear sensor with possible linearization. Monitoring of
temperature can be done using different types of sensors such as infrared sensors, thermal cameras, or any
other alternative temperature measurement technique. This paper considers the use of thermistor due to its
ruggedness and high level of sensitivity. Thermistor is a semiconductor device which senses the temperature
in the chamber and the action of its output is send to a comparator which serves as a switching device
in the circuit with the help of fast action of relay. The development of embryos in an incubator is highly
sensitive to the environmental temperatures, studies shows that temperature manipulations around 38±C can
be appropriate for hatching. The circuit consists of different stages: Power stage, stabilizing and amplifying
stage, sensing and comparing stage, switching stage and loading stage respectively. All the stages work
simultaneously to control the temperature in the chamber within the hatching period of 21 days with periodic
turning of eggs manually. The performance evaluation and its output response show a favorable outcome as
compared to standard hatching period.