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# VU meter

by

## Reynaldo Garcia

on 25 February 2015

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#### Transcript of VU meter

The VU meter was developed in the late 1930s to help standardize transmissions over telephone lines. It went on to become a standard metering tool throughout the audio industry.
Alexander Graham Bell. He was the founder of Bell Labs (which were the developers of the VU meter) one of his numerous inventions was the telephone which is used all around the world.
Research
VU meter
Introduction
Question
Hypothesis
Materials
10 LED lights
Integrated Circuit LM3914
1 Diode
1 Capacitor
1 meter red wire
1 meter black wire
1 Stripboard
1 Resistance of 10kohm
1 Resistance of 100Kohm
1 Resistance of 1,000Kohm
1 Potentiometer
2 on and off switch
2 batteries of 1.5V (AA)
1 battery of 9V
And Music
Colegio San Patricio
Science Fair 2015
VU meter
Team Members:
Luis C. Aguilar
Reynaldo Garcia
Mauricio Garza
Edgar Jaquez

Conclusion

Applications to real life
Hola rey hiso esto
We can measure volume
units with an electric circuit
to make a VU meter.

Can we measure volume units
with an electronic circuit?
Data/Observations
Our project is about how you can relate sound waves with energy waves through a simple (electric) circuit. When the circuit is connected to a device that plays music, the intensity of the music will send electric energy that will make the lights turn on and off depending on how high is the intensity.
Since our project worked, we could measure the intensity of the song through the lights and, if we checked them with a greater precision we could measure the volume units with exactitude.
First we inserted the integrated circuit LM3914, Then we placed the potentiometer on the protoboard or bread board and then we inserted the red and black wires. After that we placed the capacitor, the diode and the resistance. Later we placed the audio plug , then on\off switch that works as a mode changer.
Then we made the 12V battery with two of 1.5V (AA) and one of 9V,
connected the battery and tested.
Finally, when our project worked, we took the stripboard and then we made the same circuit on it and weld all of it with a soldering- brass.

There are many applications for VU meters, the most common of them is the one of music effects, but there are many different and useful ways to use it; it can be used on security such as if there is a loud sound it might activate an alarm or if there are dangerous electricity accidents in a power plant it may show that there is danger.
Procedure

Our project did work with the three different songs (Bangarang, Power and Let her go) that we played.
For example “Bangarang” turn on all of the LED lights most of the time, with “Power” they were from half of the LED lights to all in separate times and with “Let her go” they were even fewer the LED ligths that turn on, so we can say that our project did work.
Piezo material converts mechanical strain into electric energy, this property of piezo material could be used to make a device able to sustainably convert the sound energy to electric energy.
How energy is converted into electricity.
History of VU meter and Alexander Graham Bell
Full transcript