Refrigerator door opening alarm circuit
Source: InternetPublisher:走马观花 Keywords: Alarm circuit refrigerator oscillator binary Updated: 2020/07/14
Working principle of the circuit: This circuit uses a 9V battery as the power supply. The main circuit is composed of a 14-bit
binary serial counting oscillator (IC CD4060). Its size determines the oscillation period of the oscillator
. The resistor R1 and the photoelectric tube PC form a resistor voltage dividing circuit. VD is a
diode, and B is a piezoelectric ceramic buzzer.
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