A simple alarm circuit which can be used for fridge door open alarm, industrial control alarm. The circuit need to be tailored based on the application needs and timers can be introduced based on requirement to eliminate any false alarms.
- Battery is very critical and has to be selected based on the temperature in which circuit is used.
- Buzzer must be able to operate up to maximum battery voltage
- Select the resistive divider resistor (22K in above case) based on LDR variation
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