![]() ![]() Prior to the days when LEDs were not so popular, moving coil meter type of displays were commonly incorporated as VU meters and surely these units with there back lights ON produced a distinctive visual effect as their needles deflected from left to right displaying the varying pitch of the connected audio system. The varying response from a VU meter certainly gives a whole new dimension to a sound system making it more dynamic with its features. Without such devices attached, an amplifier system would look quite dull and without any juice. Though the unit looks quite technical, which is applied as a measuring device of audio power, in real terms these are more like decorative ornaments of an amplifier. It is also called music level indicator circuit since the music fed to the circuit is displayed through an incrementing LED bar graph illumination, where the number of LED illuminated is directly proportional to the level of the music volume or music power. It may be also considered as a device for displaying the PMPO of the amplifier at a particular volume setting. VU meter or a volume unit meter circuit is a device used for indicating the music volume output from an amplifier or a loudspeaker system.
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