상황
Design a thermostat that uses an NTC thermistor and a 74HC14 Schmitt trigger to control a heating element. The circuit turns on the heater when the temperature drops below a threshold set by the voltage divider.
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01
NTC thermistor in a voltage divider with a fixed resistor sets the temperature threshold.
02
74HC14 inverter provides Schmitt trigger hysteresis to prevent rapid on/off cycling.
03
NPN BJT switches the heater load, driven through a base resistor.
Suitable for simple on/off temperature control applications where hysteresis is needed to avoid oscillation, such as in low-power heating systems.