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A simple T/R switch where you need a low-noise receiver chain: Some rules: D1 & D2 must handle your peak transmit current and be fast diodes. Depending on current flowing thru the diodes, you may get 1Vp signal. This will reduce the transducer drive signal by this voltage drop which usually isn't a problem if driving over 10V. R1, D3, D4 may not be ...


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Here is a circuitry which can help, to be adapted to your sensor ... It was used for 40 kHz sensor. Voltage of driver may be changed and tuned (or not) transformer ratio too.


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