Designed for use with printed circuit boards, signal generators for PCBs are much like any other form of electronic audio generating system. They receive an electric signal - either in a continuous loop or in a staggered way - that causes them to make a sound. As such, electronic engineers can use signal generators in a variety of ways to create sounds following certain automated actions. If a key is pressed, then an acoustic signal generator may sound, for instance. Alternatively, an alarm or siren might be appropriate if the circuit board detects a certain temperature or other environmental condition from a sensor. Essentially, an audio signal generator acts like miniature loudspeaker and is often designed to make a high-frequency noise. Typical audio ranges can include frequencies from 400Hz through to 9kHz, or more. Piezo sound generators, and other types, are commonly supplied with connection components ready to be soldered onto a PCB, but some have wired terminals that are screwed into position. PCB sound generating devices are made by a large number of well-known manufacturers such as Digisound, Murata, Sonitron and Kingstate, to name a few. Various volumes can be sought out, so that the correct level of loudness can be achieved, depending on the particular application. Volume output is given in decibels.
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