This circuit is a design for alarm. This circuit is work using based on op amp LMC7215. This is the figure of the circuit.
If the device becomes unplugged or if the door is left open too long, the food inside can quickly become spoiled. The hobby circuit below is a battery powered alarm system, which is attached to the outside of the freezer using a couple strong magnets. Two small gate wires are fed from the alarm box to a thermistor temperature sensor, mounted inside the freezer. The alarm beeper will be activated, whenever the electronic circuit detects a freezer temperature warmer than 0 degrees C (32 F). The overall current is so low that the 9v battery powering the device will last for many year
If the device becomes unplugged or if the door is left open too long, the food inside can quickly become spoiled. The hobby circuit below is a battery powered alarm system, which is attached to the outside of the freezer using a couple strong magnets. Two small gate wires are fed from the alarm box to a thermistor temperature sensor, mounted inside the freezer. The alarm beeper will be activated, whenever the electronic circuit detects a freezer temperature warmer than 0 degrees C (32 F). The overall current is so low that the 9v battery powering the device will last for many year
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