Test and measurement

passive VU meter
If you want to fit your loudspeaker enclosure(s) with a drive indicator, it is best touse a unit that does not need a powersupply. This article describes a passive VUunit for smaller amplifiers and loudnesses—see Fig. 1. It consists of a rectifier and six(may be fewer or more) identical stagesthat each comprises a […]

digital VU meter - 2
After last part detailed description of thedesign and facilities ofthe accurate, multifaceted digital vu meter,this part’s final instalment deals with the construction and operation of the instrument.

This VU meter design considerations Most of us have over the years become familiar with the nervously moving pointers or LED bars of the VU (visual unit) meter on the front panel of a cassette tape recorder or mixing panel that indicate the level of the a.f. signal. The circuit presented in this two-part article […]