Extra components can be added for full-wave detection

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Other Materials from the Main Document

• Article «Supersized log-scale audio meter»
• Figure 1. We take the log of the input signal; its peak level is captured on C2, which is discharged slowly and linearly; and temperature- and level-corrections are applied in the current source which drives the meter
• Figure 3. Simulated and measured responses when set up for a 50 dB span with a +10 dBu maximum reading, showing the effects of temperature and op-amp offset
• Figure 4. Extra components can be added for full-wave detection
• Figure 5. Final additions: a "power-on reset", and a monostable to give ~100 ms hold time after a peak to allow the meter movement to catch up