Electronic Circuits and Tutorials
Electronics Schematics - V

Volume Unit Meters / Sound Level Monitors

3 Level Audio Power Indicator: Battery-operated 3 LED display that connect it to loudspeaker output

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 components

Audio LED VU Meter: built around discrete components

Audio tone VU Meter

Audio VU Meter

Digital Volume Control: based on DS1669 Digital Pot IC

Digital 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 Meter

LED Barograph Driver: Fair Warning: this site has pop-up ads

Mono VUMeter I

Precision Audio MilliVoltmeter:  Measures10mV to50Volt RMS in eight ranges Simply connect to your Avo-meter set @50µA range

Sound Level Meter

Three Level Audio Power Indicator:  Battery-operated Three LED display that connect it to loudspeaker output

Understanding Peak Reading Meters:  includes1-example circuit diagram

VU & PPM Audio Metering: circuits using analog needle meters

VU Meter: 5 led VU meter, in PDF format, includes circuit board, text in Finnish

VU Meter Amplifier

VU Stereo Meter: will indicate the volume level of the audio going to your speakers by lighting up LEDs, based on LM3915 IC

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