i had developed the circuit for both Tx and Rx. and i am getting the signal back for 1.2mts,
now i need to develope a circuit that can use only one sensor for TX and RX, nothing but a switch to swicth between TX mode and RX mode,and another thing is to improve the range of the sensor.
Hi 24+,
Yets clear me-tnx.
I would switch the RX-input "short" with a transistor/switching diode as BASxxx until sending time...
Btw: maybe it helps for you: http://www.discovercircuits.com/U/ultrasonic.htm
K.
If the transmit driver is high impedance in inactive state and the receive amplifier doesn't load the transducer, you don't need a switch. This is the usual technique e.g. for echo sounders. A voltage limiter at amplifier input may be useful, possibly a blanking circuit to speed up the amplifier recovery after end of transmission.