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Volume Unit Meters (VU Meters) / Sound Level Monitors
Last Updated on: Tuesday, April 01, 2014 04:30 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

8 Stage LED VU Meter -  The circuit below uses two quad voltage comparators (LM339) to illuminate a series of 8 LEDs indicating volume level. Each of the 8 comparators is biased at increasing voltages set by the voltage divider so that the lower right LED comes on first when the input is about 400 millivolts or about 22 milliwatts peak in an 8 ohm system. The divider voltages are set so that each LED....(circuit / schematic design added 6/06)
Audio LED VU meter -  Audio level meter circuits are fairly often requested.  The circuit was designed to work with an audio power amplifier which operated off +18v-0v-18v power rails. The actual voltage used is not too critical except that the feedback is referred to the LED chain....[4QD-TEC: Electronics Circuits Reference Archive]
Audio level meter VU Meter -  This circuit uses just one IC and a very few number of external components. It displays  audio level in terms of 10 LEDs. The input voltage can vary from 12V to 20V, but suggested voltage is 12V. The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs providing a logarithmic 3 dB/step analog display....(added 09/05)
Audio power meter  -  This VU (volume-unit) meter is capable of monitoring and displaying power levels present at the speaker terminals of an stereo audio power amplifier. The levels are displayed in ten discrete steps.  This meter is not designed to give an accurate display of the power levels....LM3915, stereo VU meter ....
Audio VU Meter -  LM324,This circuit uses two quad op-amps to form an eight LED audio level meter. The op-amp used in this particular circuit is the LM324....

Decibel Meter -  The circuit below responds to sound pressure levels from about 60 to 70 dB. The sound is picked up by an 8 ohm speaker, amplified by a transistor stage and one LM324 op-amp section. You can also use a dynamic microphone but I found the speaker was more sensitive. The remaining 3 sections of the LM324 quad op-amp are used as....
Digital volume control (Aaron Cake) -  based on DS1669 Digital Pot IC (added 8/03)
Digital volume control has log taper -  11-Apr-02 Issue of EDN  Digital potentiometers provide a compact and convenient way to attenuate audio-amplifier signals. However, most such potentiometers suffer from at least one flaw  a nonlogarithmic step increment. To avoid this problem, a user must usually step the potentiometer in a nonlinear sequence to simulate a logarithmic taper.... [Design Idea by Doug Farrar, Los Altos, CA]
High Resistance Voltmeter -  ....
High-Resolution Volume Unit Meter Simplifies CD Recording -  06/21/01 EDN-Design Ideas....Digitally recorded music on CDs offers superior quality to that recorded on vinyl records or tape, but most prerecorded CDs have an annoying characteristic  The average volume levels of the recorded signal can vary by as much as 14 dB from disk to....-- [Chester Simpson, National Semiconductor, Santa Clara, CA] EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
LED Audio UV Monitor -  The circuit is completely conventional, and is based on the application notes from National Semiconductor. The circuit is shown in Figure 1 and as you can see it uses a single IC and a few discrete components. The extra diode (D3) is included to ensure that the DC to the LEDs is almost unfiltered....(added 5/02)
Precision Audio MilliVoltmeter -  Measures10mV to50Volt RMS in eight ranges Simply connect to your Avo-meter set @50µA range....
Sound Level Meter -  One chip replacement for the standard analog meters, based on LM3915 audio level IC.… [Aaron Cake's design]
Stereo VU Meter Circuit -  This is it. It's a STEREO LED LEVEL METER. It's the cheapest and best bar graph display available and best of all, it uses readily available components. You only need a handful of LEDs, 22 transistors, some resistors, diodes and a set of....
Stereo-VU-Meter (simpel)  -  Dieses Stereo-VU-Meter ist sehr simpel aufgebaut und lässt sich einfach an ein Line Audio-Signal hängen. Dann zeigt es den Signalpegel mit 10 Leuchtdioden pro Kanal an. Diese Schaltung hat keinen Verstärker vorgeschaltet, weshalb der....
Volume Control (Aaron Cake) -  based on DS1669 Digital Pot IC (added 8/03)
Volume Control has Log Taper -  11-Apr-02 Issue of EDN   Digital potentiometers provide a compact and convenient way to attenuate audio-amplifier signals. However, most such potentiometers suffer from at least one flaw  a nonlogarithmic step increment. To avoid this problem, a user must usually step the potentiometer in a nonlinear sequence to simulate a logarithmic taper.... [Design Idea by Doug Farrar, Los Altos, CA]
VU & PPM Audio Metering -  circuits using analog needle meters (added 5/02)
VU Meter (spelektoniikka) -  5 led VU meter, in PDF format, includes circuit board, text in Finnish (added 5/02)
VU Meter 3 -  A very simple circuit of indication of level, with 10 Led. Is used the circuit of half-wave rectification of precision round the IC2, with gain one. With switch S1, we can select the indication of Led. The level of entry is 60 mV-1.25 V....
VU Meter Amplifier -  (electronic schematic / circuit added 4/02)
VU Stereo Meter -  This project will indicate the volume level of the audio going to your speakers by lighting up LEDS. The LEDS can be any color so mix them up and really make it look good. The input of the circuit is connected to the speaker ….(added 05/02)
VX2SE -  Voltage-Controlled Solar Engine:This is Wilf Rigter's voltage-doubling solar engine design; very useful for loads that require higher voltage (like those "super-bright" LEDs).  (added 11/05)

Volume Unit Meters (VU Meters) / Sound Level Monitors


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