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Scheme of the indicator:
Only that one chip. When wet sensor SE1, starts beeping buzzer and the led turns on. To to turn off the alarm it is necessary to dry the sensor and press the S1 button.
The circuit uses a buzzer with built-in generator. The design of the sensor can be any, for example, you corrode like drawing on a piece of foil fiberglass.
Have chips there are foreign counterpart - a CD4093.
Publication: www.radiokot.ru, www.cxem.net