This circuit compares a rectified input, f.`!N, with a voltage that decays exponentially across a 4. 7-KO resistor and a ·o.Ol-I`F capacitor. Comparing the exponentially decaying voltage with the rectified input provides a peak-level indication that requires no adjustment.
Peak-db-meter - schematic

A phase-locked loop controls the scan rate so that each LED represents 6 dB in the 30 dB range.

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