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Volume Unit
Meters (VU Meters) / Sound Level Monitors
Last Updated on:
Friday, October 16, 2009 03:43 AM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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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) |
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Analog
LED Bar VU Meter - 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 which itself is
anchored to a +12v rail, hence the separate stabilizer .... (added 5/09) |
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Audio Frequency Meter - 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 which itself is
anchored to a +12v rail, hence the separate stabilizer .... (added 5/09) |
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Audio
LED VU Meter - 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 which itself is anchored to a
+12v rail, hence the separate stabilizer .... (added 5/09) |
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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) |
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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 (added
08/08/08) |
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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 (added
08/08/08) |
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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 ....(electronic circuit added 10/05) |
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Digital
volume control (Aaron Cake) - based on DS1669 Digital Pot IC (added 8/03) |
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Digital Volume Control has Log Taper - 04/11/02 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
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
added 1/05) |
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High Resistance Voltmeter - (electronic circuit added 10/05) |
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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.....(design idea added 5/03) |
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LED Audio VU 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) |
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LED Bar VU Meter - 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 which itself is
anchored to a +12v rail, hence the separate stabilizer .... (added 5/09) |
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LED VU Meter - 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....(schematic added 6/07) |
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Precision Audio MilliVoltmeter - Measures10mV to50Volt RMS in eight ranges
Simply connect to your Avo-meter set @50µA range (added 9/04) |
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Sound Level Meter (Aaron Cake) - One chip replacement for the standard analog
meters, based on LM3915 audio level IC... (added 7/05) |
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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....(added 08/08/08) |
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Volume Control (Aaron Cake) - based on DS1669 Digital Pot IC (added 8/03) |
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Volume Control has Log Taper - 04/11/02 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
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 added 1/05) |
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VU and PPM Audio Metering - circuits using analog needle meters (added 5/02) |
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VU Meter - 5 led VU meter, in PDF format, includes circuit board, text in
Finnish (added 5/02) |
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VU meter - 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. (added 08/08/08) |
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VU meter - 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...(added 08/08/08) |
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VU Meter Amplifier - (electronic schematic / circuit added 4/02) |
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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) |
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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) |
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