versatile audio peak meter - with peak hold facility

audio peak meter ... elektor june 1984 A.B. Hill The display of this versatile audio peak meter is formed by a row of LEDs and features a "peak hold" facility that can be used while the normal signal levels are monitored. The meter includes an input buffer stage that can be switched to enable the monitoring of signals at loud- speaker level or at line output level. An optional variable-frequency band- pass filter is also included. Specification Input shaping circuit audio peak meter.. . frequency response: low-pass filter: band-pass filter: (optional) 10 W into 8 ohms) bandwidth at —3 dB of rated output better than 100 kHz cut-off frequency 70 Hz slope —6 dB/octave (-20 dB/decade) gain at centre frequency 0 dB centre frequencies 200 Hz, 500 Hz, 1250 Hz, 3 kHz, 8 kHz —3 dB points 125 Hz, 320 Hz, 800 Hz, 2 kHz, 5 kHz, 12.5 kHz slope —12 dB/octave (-40 dB/decade) ... with peak hold facility As the input sensitivity can be matched to either line level or power amplifier output...