High-sensitivity water sensor and amplifier circuit

Abstract

The invention discloses a high-sensitivity water sensor and amplifier circuit which comprises a positive metal water immersion detection end, a negative metal water immersion detection end, a first transient suppression diode, a first resistor, a third triode and a second resistor. The water immersion detection ends are made of metal. When water exists between the two metal water immersion detection ends, due to the fact that voltages exist between the two metal water immersion detection ends, the water is ionized, the two metal water immersion detection ends are connected, currents pass through a base electrode of the first resistor and a base electrode of the first triode, then the emitter end and the collector end of the first triode are connected, the voltage of the emitter end of the first triode is changed to be the high level from the lower level, and the two metal water immersion detection ends are immersed in the water in the change. The circuit integrates the function of a sensor and the function of an amplifier, the water immersion information can be sensed with high sensitivity, and water immersion signals are processed by a single-chip microcomputer. The circuit is simple in design, low in cost, easy to implement and high in sensitivity.

Description

technical field [0001] The invention belongs to the field of electronic information, in particular to a high-sensitivity water immersion sensor and an amplifying circuit. Background technique [0002] In daily life, it is often encountered that the tap water in the home runs out, or the heating in the north runs out, or the sewer is blocked and the dirty water is poured back into the house, which will bring a lot of trouble to the house or the neighbors downstairs. Economic loss brings inconvenience to family life. At present, the price of water immersion alarms on the market is relatively high, the circuit is complicated, the practicability is not good, it is difficult to maintain, and the sensitivity is low. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a high-sensitivity water immersion sensor and an amplifying circuit. [0004] The present invention is mainly realized through the fo...

AI Technical Summary

Problems solved by technology

[0002] In daily life, it is often encountered that the tap water in the home runs out, or the heating in the north runs out, or the sewer is blocked and the dirty water is poured back into the house, which will bring a lot of trouble to the house or the neighbors downstairs. Economic loss and inconvenience to family life. The current flood alarms on the market are relatively expensive, have complex circuits, poor practicability, difficult maintenance, and low sensitivity.

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