Volume Unit Meters / Sound Level Monitors
30 DDm to +30 DDm Audio Level Meter: circuit with balanced input and adjustable gain to drive needle type VU meter, uses special amplifier module from Op-Amp Labs
Analog LED Bar VU Meter: built around discrete componentsAudio LED VU Meter: built around discrete components
Audio tone VU Meter Digital Volume Control: based on DS1669 Digital Pot ICDigital volume control has log taper: 04/11/2002 EDN - Design Ideas / Digital potentiometers provide a compact and convenient way to attenuate audio-amplifier signals. However, most such potentiometers suffer from at least one flaw: a non-logarithmic step increment. To avoid this problem, a user must usually step.
High Resolution Volume unit Meter Simplifies CD Recording: 06/21/2001 EDN-Design Ideas / (One of several circuits in this PDF) CD digital-recording decks typically have peak-reading-only volume-level meters. This feature is adequate to prevent clipping but does a poor job of reading the average volume, or loudness, level. A high-Resolution, average- (not peak-) reading volume-unit meter produces an accurate reading of loudness.LED Audio UV Monitor: logarithmic scale with3 dB steps, based in LM3915 IC
LED Bar VU MeterLED Barograph Driver: Fair Warning: this site has pop-up ads
Mono VUMeter IPrecision Audio MilliVoltmeter: Measures10mV to50Volt RMS in eight ranges Simply connect to your Avo-meter set @50µA range
Sound Level MeterThree Level Audio Power Indicator: Battery-operated Three LED display that connect it to loudspeaker output
Understanding Peak Reading Meters: includes1-example circuit diagramVU & PPM Audio Metering: circuits using analog needle meters
VU Meter: 5 led VU meter, in PDF format, includes circuit board, text in Finnish VU Stereo Meter: will indicate the volume level of the audio going to your speakers by lighting up LEDs, based on LM3915 IC