[SOLVED] Ultrasonic receiver data transmission

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agreatstar

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I am using ultrasonic receiver for ultrasonic data transmission. The circuit diagram is attached herewith. I am getting peaks when transmitter and receiver are perfectly aligned and 1.5 mteres apart. But with increasing distance, reliability falls. Also there are a lot of false peaks which lead to spurious data values. Can anybody please point out any mistake in the circuit? ( I only have a single ended supply and transmitter circuit is working perfectly as I get peaks even at 2-3m but the data transmission fails. Expected data transmission rate is 100 bytes per second).
 

Ultrasonic transmission requires both TX and RX transducers to resonate at the same frequency. Try adding variable capacitor (10-300 pF) in parallel with one transducer, if no improvement, then to the other.
Use a parabolic reflector on one or both sides to increase directivity.

Try checking the waveform with an oscilloscope before the amplifier and after it, to see if no limiting action occurs.
 

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