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I try to use single piezo as transceiver. Is this possible if i can T/R switch using FET or BJT ? I found this schematich but not sure if it works. https://www.researchgate.net/publication/252602894_Design_of_Pic-Controlled_Pulsed_Ultrasonic_Transmitter_for_Measuring_Gingiva_Thickness/figures?lo=1&utm_source=google&utm_medium=organic enter image description here

In somewhere nearby the blue cursor at right side echo signal must be showing but not. RC circuit below the tx is symbolling the PZT. enter image description here enter image description here

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  • \$\begingroup\$ Why don't you run the circuit through a simulation tool (like most EEs do these days)? \$\endgroup\$
    – Andy aka
    Commented Jul 3 at 20:07
  • \$\begingroup\$ i dont have enough parameters to simulate the piezo \$\endgroup\$
    – ali demir
    Commented Jul 3 at 20:10
  • \$\begingroup\$ Yes, it can work ... Just add Tx and Rx. Sometimes, a transfo is also used ... \$\endgroup\$
    – Antonio51
    Commented Jul 3 at 20:37
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    \$\begingroup\$ Do i have to drive the piezo at really high voltages ? I was trying to do with 5Vpp (arduino digitalwrite) \$\endgroup\$
    – ali demir
    Commented Jul 3 at 21:02
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    \$\begingroup\$ @alidemir If the range is 32 mm, as depicted in the oscillogram, you can't use 4 kHz (a number used in your previous post) as the wavelength is about 85 mm. Using a 40 kHz transducer, you may have a better chance if Q of the transducer is sufficiently low enough where the ringing has died down. At this range, you probably don't need much drive level, i.e., 5 V drive may be enough. You many need to put a resistor across the ceramic to lower the Q or use an acoustically absorbent backing to lower the Q. \$\endgroup\$
    – qrk
    Commented Jul 3 at 22:27

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