In April 1977 (Elektor 24) a design was published for an audio output level meter. The meter, which incorporated a LED `thermometer-scale` display, could be modified to give either a `VU` or `PPM` type of response. With the aid of the following add-on circuit, it is possible to improve the resolution of the meter at the lower end of its scale, allowing much more accurate measurement of signal levels during quiet passages of music and speech.
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