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Ultrasonic Switching principle brief explanation

2015-09-14 11:39  
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This article is a brief explanation of ultrasonic switching principle. The combination of text read schematics would be more effective to grasp this principle. The circuit described generates (transfer) of the ultrasonic frequency 40-50 kHz. As with any other remote control system which cirucit too including miniature transmitter and receiver circuits. Transmitter generates ultrasonic waves from the transmitter and receiver senses a relay switch. Ultrasonic sensors use a 555 basis unstable  multivibrator . Its frequency oscillation 40 - 50 kHz. An ultrasonic transmitter transducer to transmit ultrasonic sound here is very effective. Is powered by a single 9-volt battery preview. Ultrasonic receiver circuit uses an ultrasonic sensing transducer ultrasonic signal receivers. It also uses a two-stage amplifier, a rectifier stage, and an operational amplifier in inverting mode. Op amp output is connected to the relay via the included relay driver stage. A 9-volt battery can be used for the receiver circuit, if desired. When the switch S1 is pressed, the transmitter, it generates ultrasonic waves. Sound by the ultrasonic receiver transducer. It converts the electrical changes by the same frequency. These signals are amplified by the transistors T3 and T4. Signal amplification and then rectified and filtered. Filtered DC voltage to the inverting op amp IC2 medal. The non-inverting pin of IC2 is connected to a variable DC voltage VR2 preset threshold is determined by an ultrasonic signal received by the receiver to operate the relay RL1. Inverted output of IC2 is used to bias transistor T5. When the transistor T5 for its supply base tendencies transistor T6. When the transistor T6 for its actuation relays. This relay can be used to control any electrical or electronic equipment. Important:
1. Can transform to generate ultrasonic frequency from 40 to 50 kHz range adjustment VR1. Adjust for best performance.
2. Ultrasound is highly directional. So when you operate the switch, ultrasonic sensor should be placed on the sensor's transmitter and the receiver transducer ultrasonic receiver circuit to work properly.
3. Using a 9-volt battery preview transmitters. Generation cell and the receiver can be always kept in the open position.
4. For lock facility DPDT relay if you want to turn on and off the load. A trigger can be inserted between IC2 and relays. If you only want a "time delay" Use 555 at the output of IC2. Vibrant relay time required by the timing component 555 monostable multivibrator.
5. Ultrasound is emitted by a number of natural sources. Therefore, sometimes, the circuit may falsely trigger the sea when the trigger is a circuit, there is no remedy.
If you are the first to understand this principle, we might Duokanjibian. The principle is simple but effective.

Ultrasonic Switch

Ultrasonic Switch

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