LED VU/PPM

VU (Volume Unit) meters and PPMs (Peak Programme Meters) are used widely in the recording industry and by the amateur to monitor audio signal levels. Meters using conventional moving coil indicators have, however, several disadvantages. The ballistics of the meter movement are quite critical, which makes the meters expensive. They are also relatively bulky, which means that in a multichannel recording system the meters occupy a great deal of space and are difficult to read simultaneously.