Electronic Circuits and Tutorials
Electronics Schematics - S

Sound Level Monitors / Volume Unit Meters - Sensors and Detectors

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 no 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 Milli Voltmeter: 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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