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
| Authors | Nick Cornford |
| Main Document | Article «Supersized log-scale audio meter» |
| Description | Figure 1 |
| File Format / Size | PDF / 20 Kb |
| Document Language | English |
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
