SIMPLE HEAT SWITCH CIRCUIT
Here we are discussing about a Simple Heat sensing or detecting circuit.
This circuit indicates you whenever it senses Temperature. The sensing is done by using a THERMISTOR of 110 ohms. The resistance of Thermistor reduces on increase in Temperature which makes the LED glow.
The circuit is powered by a 6V battery.
CIRCUIT DIAGRAM FOR HEAT DETECTOR
R1 THERMISTOR 110Ω
Q1 Bc548 NPN