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Freezer Monitor Alarm

Freezer Monitor Alarm

+

T1*

AC125

R1

100Ω

R2

220Ω

C3

4.7μ

25V

C1

0.47μ

VR1

100K

TESTING WAS DONE USING NTC THERMISTOR

RL1 = 9V, 1C/O RELAY

GND

+9V

S1

ON/OFF

SWITCH

+9V

PZ1

PIEZO

BUZZER

RL1

N/O

D1

1N4007

C2

0.1μ

T2

BT139

T3

BS170

D

S

G

A

G

K

N/C

}

*SEE TEXT

Freezer Monitor Alarm

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publish time: 2020-09-29
Circuit Everyday

For some reason, if the temperature is too high and the refrigerator rises to the thawing point, everything stored in the deep freezer will melt. However, the freezer monitor works and sends an alarm to raise the temperature of the refrigerator to the melting point.

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