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Volume Unit Meters (VU Meters) / Sound Level Monitors, Page 2
Volume Unit Meters (VU Meters) / Sound Level Detectors:  #'s-L;    
M-Z
Last Updated on: Tuesday, August 18, 2015 06:50 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. . .  [Bill Bowden]

 

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 which itself is anchored to a +12v rail, hence the separate stabilizer for this. It has one large advantage over most of the LED chips available - all the LEDs are in series so it only draws 20mA irrespective of the number of LEDs illuminated[4QD-TEC: Electronics Circuits Reference Archive]. . .  [Richard Torrens]

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 levelsLM3915, stereo VU meter . . .  [Carl's Electronics]

Audio VU Meter -  A VU meter with 20 LED's. The input source can be a line input or a microphone. . .  [by P. Townshend - EduTek Ltd]

 

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. . .  [by Matthew Hewson]

 

Audio VU meter 9 leds -  5 LED VU Meter kit is based on LB1409 IC from SANYO, which will indicates the volume level of the audio signal it senses. . .  [by IQ Technologies Industry, unless otherwise noted online]

 

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. . .  [by Bill Bowden]

 

Digital volume control -  This digital volume control has no pot to wear out and introduces almost no noise in the circuit. Instead, the volume is controlled by pressing UP and DOWN buttons. This simple circuit would be a great touch to any home audio project. . . .  [Design by Aaron Cake]

 

Digital volume control -  Circuit of a digital volume control using six discrete ICs, including a 5V regulator, is presented. IC1 (555) is configured to function as astable flip-flop. Its frequency or period may be adjusted by proper choice of resistors R44, R45 and capacitor C6 combination. Here it is for 0. 3 second period. . .  [by IQ Technologies Industry, unless otherwise noted online]

 

Digital Volume Control -  This circuit could be used for replacing your manual volume control in a stereo Amplifier. In this circuit, push-to-on switch S1 controls the forward (volume increase) operation of both channels while a similar switch S2 controls. . . 

 

Digital Volume Control Circuit -  The heart of this digital volume controller DVC circuit is IC2 4067, 16-channel analog multiplexer. Because the 1kΩ has been connected between every input and output, the multiplexer can act like a potentiometer. The total resistance is 15kΩ. You can use different values for the resistor to obtain a different characteristic. . . .  [Circuit posted by Popescu Marian]

 

Digital volume control has log taper -  11-Apr-02 EDN Design Idea   Digital potentiometers provide a compact and convenient way to attenuate audio-amplifier signals. However, most such potentiometers suffer from at least one flawa nonlogarithmic step increment. To avoid this problem, a user must . . .  [by Doug Farrar, Los Altos, CA]

 

Digital Volume Control using DS1669 Digital Pot IC -  This digital volume control has no pot to wear out and introduces almost no noise in the circuit. Instead, the volume is controlled by pressing UP and DOWN buttons. This simple circuit would be a great touch to any home audio project. . . .  [by Aaron Cake]

 

High Resistance Voltmeter -  This circuit is designed to provide an inexpensive way to to create a High Impedance Voltmeter while making use of an inexpensive analog or digital multimeter. The circuit is specifically designed for testing phototransistors when they are used in the circuits shown at this site. It has a very high input impedance that will not "Load Down" the sensor that is being checked. . . .  [Rob Paisley]

 

High-resolution volume-unit meter simplifies CD recording -  06/21/01  EDN Design Idea   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 disk. S. . .  [by Chester Simpson, National Semiconductor, Santa Clara, CA]

 

LED Audio UV Monitor -  The circuit is completely conventional, and is based on the App Note - 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. . .  [Rod Elliott (ESP)]

 

LEDs Indicate Sound Level -  08/25/11  EDN Design Idea   Build a battery-operated portable meter to measure sound-pressure levels. This Design Idea describes a battery-operated, portable soundlevel meter (Figure 1). Its portability makes it useful for detecting the source of noise in automotive engines and power trains, factory machinery, and residential HVAC (heating/ventilation/air-conditioning) systems. . .  [by Stephen Kamichik, Ile Bizard, PQ, Canada]


Volume Unit Meters (VU Meters) / Sound Level Monitors
Volume Unit Meters (VU Meters) / Sound Level Detectors:  #'s-L;    
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