View Full Version : about ultrasonic sensors

03-06-2006, 11:13 PM
hi friends,

a small problem.i have with me an ultrasonic transmitter .how do i identify the polarity of the terminals.

one more thing i want to know what is the maximum voltage that i can apply accross the terminals of the transducer and the current thru it without breaking it.

please reply asap


03-08-2006, 03:42 PM

The ultrasonic transducers Ive worked with were not polarised. The two leads looked slightly different but the transmitter worked either way. I drove the transmitter with a +10V to -10V signal (generated of a 5V supply with a MAX232). I dont know if it can be driven any higher than that, but with a 20V peak-to-peak I got around 270cm range which was enough for me.