Water-level alarm device
A technology of water level alarm and timer, applied in the field of water level alarm device and liquid level monitoring device, can solve the problems of complicated circuit design, accidents and high price, and achieve the effect of safe and simple circuit design.
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[0007] The present invention will be further described below in conjunction with accompanying drawing.
[0008] Such as figure 1 As shown, a water level alarm device includes two detection electrodes placed in water, a detection circuit connected to the detection electrodes, and a speaker Y connected to the detection circuit; the core of the detection circuit is composed of a 555 timer and several capacitors and resistors. Multivibrator; one of the detection electrodes is connected to pins 2 and 6 of the 555 timer, and the other detection electrode is grounded through capacitor C1; a speaker Y is connected in parallel between pins 3 and 8 of the 555 timer; pin 7 of the 555 timer Connect to the power supply through resistor R1 and ground through resistor R2. The core of the circuit is a multivibrator composed of 555, capacitor C, resistors, etc. In addition, there are detection electrodes, speaker Y, etc. In order to increase the service life of the speaker Y, the negative p...
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