terça-feira, 2 de agosto de 2011
sábado, 16 de abril de 2011
Harmonics on a Guitar
We talked about frets on a guitar and how when you push the string into the fret board it raises the pitch on the note by changing the length of the standing wave on the string. Another interesting thing you can do is this: after plucking the open string, just lightly touch the string with your finger at the 12th fret. A sound like a bell or flute will result, as you create the second harmonic of the original standing wave.Here’s what happens: by touching the string lightly while it’s vibrating, you cause it to come to rest at that point you’re touching. This results in another node, as shown above with the second harmonic. Touching the string at the 7th or 5th fret can make the third and fourth harmonics, with higher numbers of nodes.
But if you touch the string someplace that does not result in equal segments between nodes, no harmonic is produced and the string stops. This is simply math. Guitar players can tell you all the spots where harmonics can be produced, even if they don’t care too much about the math and physics behind it. (Some of them care though!)
via: http://clearscience.tumblr.com/post/3764564296/we-talked-about-frets-on-a-guitar-and-how-when-you
sexta-feira, 15 de abril de 2011
Guitar Fretboard Physics
Since we were talking about guitars and how their pickups work, the Clear Science staff wanted to point out that all kinds of physics can be illustrated with a guitar. Take for example the vibration of the strings, which produces the notes. The strings are held stationary two places: at the nut, shown by the blue line, and at the bridge, shown by the grey line.When you pluck a string, you set up a standing wave, with stationary nodes at the nut and bridge. When you fret the string (i.e. push it down with your finger), you change the distance between these nodes, and it changes the note.
The 12th fret is exactly halfway along the string, and when fretted there will produce a note one octave higher than the unfretted string. (For example, the top string is generally an E, and the note at the 12th fret is a higher E.) The 7th fret is 2/3 of the way along the string, and the 5th fret is 3/4. These special frets are usually marked with pearling or with some dots.
via: http://clearscience.tumblr.com/post/3744206682/since-we-were-talking-about-guitars-and-how-their
quinta-feira, 14 de abril de 2011
Guitar Pickups and Induction
Pickups are the strips you see under the strings on an electric guitar. They turn the physical vibration of the strings into an electrical signal. On an acoustic guitar, you hear the sound waves created by the strings’ vibration. On an electric guitar, you hear the electrical signal after it’s been run through an amplifier and comes out of a speaker. (Although the Clear Science art director couldn’t have an amp when he was a kid, so would put his ear on the horn of the guitar and hear the sound waves traveling through the solid guitar body.)Guitar pickups work by electromagnetic induction, so let’s talk about what that is. If you have a coil of wire (a copper coil is illustrated above), a magnet passing through the coil will induce an electromotive force (EMF) in the coil. This EMF will cause an electric current to flow. (Incidentally, this is also how electric generators work.)
This concept is called Faraday’s law of induction, discovered by Michael Faraday. The EMF is equal to the time rate of change of the magnetic flux through the coil. Magnetic flux means the amount of magnetic field per area per time. Said plainer, this means changes in the magnetic field will cause some kind of current.
via: http://clearscience.tumblr.com/post/3564812865/pickups-are-the-strips-you-see-under-the-strings
terça-feira, 12 de abril de 2011
quinta-feira, 10 de fevereiro de 2011
sexta-feira, 12 de novembro de 2010
domingo, 10 de outubro de 2010
sexta-feira, 8 de outubro de 2010
sábado, 4 de setembro de 2010
domingo, 1 de agosto de 2010
Orianthi
domingo, 4 de julho de 2010
sábado, 3 de julho de 2010
Classic Rock Guitar Riffs Quiz
Awesome! Isto rocka \m/
Tive 66%. E vocês?
http://www.guitarburn.com/classicriffs/guitarquiz.htm
segunda-feira, 3 de maio de 2010
sábado, 5 de dezembro de 2009
segunda-feira, 16 de novembro de 2009
sábado, 22 de agosto de 2009
Where The Wild Things Are
Aproveito para deixar o trailer deste lançamento. Para quem sempre se perguntou como é um concerto do Steve Vai, este é um bom exemplo. Está lá todo o folclore, a ventoinha no cabelo, as roupas vistosas. Ah, e neste caso concreto, dois violinistas.
sexta-feira, 14 de agosto de 2009
Obituário: Les Paul
sábado, 9 de maio de 2009
3 é uma multidão
Numa coisa, todos são iguais: as músicas são más.
terça-feira, 7 de abril de 2009
Diz o manco do coxo
Fazendo-se representar pelos seus advogados, Chris Martin e companhia fizeram saber que eventuais semelhanças entre as duas músicas não são suficientes para que Joe Satriani receba uma compensação.
O mesmo site noticia que os advogados dos Coldplay afirmam que a música de Joe Satriani "não tem originalidade" e não deve, por conseguinte, ser protegida pela lei de direitos de autor.»
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