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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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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] |
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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
.... |
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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....
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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.... |
| Digital volume control (Aaron Cake) - based on
DS1669 Digital Pot IC (added 8/03) |
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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] |
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High Resistance Voltmeter - .... |
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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....-- [Chester Simpson, National Semiconductor, Santa Clara, CA] EDN is
migrating links. This link is not verified. Search the "title" + "EDN" for new
link. |
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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) |
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Precision Audio MilliVoltmeter - Measures10mV to50Volt RMS in eight ranges
Simply connect to your Avo-meter set @50µA range.... |
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Sound Level Meter - One chip replacement for the standard analog meters,
based on LM3915 audio level IC.… [Aaron Cake's design] |
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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.... |
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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.... |
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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 - 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] |
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VU & PPM Audio Metering - circuits using analog needle meters (added 5/02)
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VU Meter (spelektoniikka) - 5 led VU meter, in PDF format, includes circuit
board, text in Finnish (added 5/02) |
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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.... |
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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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