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Ultrasonic Liquid Level Indicator Circuit Composed Of NE555

2014-11-16 09:57  
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Ultrasonic Liquid Level Indicator Circuit Composed Of NE555
The picture shows the ultrasonic liquid level indicator circuit. This circuit is made up of ultrasonic transmitter circuit and receiver circuit.The ultrasonic transmitter circuit is made up of 555, R1, W1, C1 and ultrasonic transmitter head UCM40T. The ultrasonic receiver circuit is made up of the corresponding receiving head UCM40R, cascade amplifier BG1 and BG2, detecting circuit and so on. When the liquid level is closing to the receiver head, the voltage meter's deflection angle would be increasing. The closer to the liquid level, the bigger the corresponding deflection angle would be.Because the ultrasonic has the featrue that it would not be effected by the liquid's concentration and electric conductivity, so this circuit would be better and have higher accuracy than general contacting liquid level display circuit.