These ceramic piezo transducer elements generate a range of audible tones & frequencies when energised by 3V peak square wave. They can be driven direct from CMOS ICs with low power consumption. They are supplied unhoused & with wires attached. Provided they are mounted rigidly in the prescribed manner outputs of up to 90d B can be achieved. In addition to a wide range of applications where audible warnings or indications are preferred to visual other uses include toys clocks & watches calculators & electronic games using the transducer in place of a speaker. Because there are no moving parts to wear out these elements are reliable for use in professional commercial & industrial applications. They withstand severe environmental conditions & prove durable in domestic appliances without causing r.f. interference. A range of different sizes are available. Specifications Piezo Transducer 27mm 1.8k Hz Resonant frequency 1.8k Hz plusmn 0.5k Hz Impedance at resonance 800 Omega Capacitance 25n F plusmn 30 Maximum input voltage 30V p-p Operating temperature-20 C to 70 CPiezo Transducer 27mm 4.2k Hz Resonant frequency 4.2k Hz plusmn 0.5k Hz Impedance at resonance 500 Omega Capacitance 14n F plusmn 30 Maximum input voltage 30V p-p Operating temperature-20 C to 70 CPiezo Transducer 35mm 2.8k Hz Resonant frequency 2.8k Hz plusmn 0.5k Hz Impedance at resonance 450 Omega Capacitance 20n F plusmn 30 Maximum input voltage 30V p-p Operating temperature-20 C to 70 CPiezo Transducer 41mm 2.0k Hz for speech Resonant frequency 2.0k Hz plusmn 0.5k Hz Frequency range 750 Hz to 20k Hz Impedance at resonance 600 Omega Capacitance 40n F plusmn 30 Maximum input voltage 15V p-p Operating temperature-20 C to 70 CPiezo Transducer 50mm 2.8k Hz Resonant frequency 2.8k Hz plusmn 0.5k Hz Impedance at resonance 500 Omega Capacitance 20n F plusmn 30 Maximum input voltage 30V p-p Operating temperature-20 C to 70 CNodal ring diameter 34mm