Kepo piezo transducers 57mm diameter kepo pct g5720 6320 the kepo piezo transducer 1 5khz 57mm is able to generate a continuous tone nature when energised by a 42v peak square wave also allowing an output of 104db42vrms1khz to 5khz30cm kepo pct g5720 6320 piezo transducer 1 5 khz 57mm