The LM358 op amp compares the voltage divider between the thermistor and the adjustable potentiometer to control the MOS tube switch to achieve the adjustable constant temperature function.
There are two versions, one with adjustable constant temperature and one with simple and beautiful appearance
The power supply should preferably be able to output 5V2A
The designed maximum temperature is about 72°, but the actual temperature measured with 5V power supply can only reach about 60°. The main reason is that the heating area is too large. When the heat generated is equal to the heat dissipated, the temperature cannot rise.
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