An extremely loud PCB- mounting piezoelectric buzzer designed to operate over a wide rangeof supply voltages. Ithas a built-in driver circuit & requires only a DC voltage to drive it. Working with a 24 Vdc supply voltage this tiny unit can supply sound levels of over 95d B at a 30cm distance. The unit will operate well with 5V TTL voltages drawing only around 2m A. It will therefore make an excellent bell or warning alarm for digital systems. Two 1.5mm dia. holes are required 16mm apart. The case is finished in a cream colour & features a dot to indicate the side with the positive terminal. Specifications Resonant frequency 2700 Hz plusmn 500 Hz Operating voltage 3 to 24 Vdc Current at 12V DC10m A max. Sound output at 30cm 90d B typical 12 Vdc Operating temperature-10 to 60 CSize excluding pins 16mm high x 24mm dia. Length of pins 5mm