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Looper's Delight
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Yes, nice explanation! On Tue, Jan 24, 2012 at 3:44 PM, Charles Zwicky <cazwicky@earthlink.net> wrote: > I've seen a lot of interesting misconceptions about how the ebow works > and > how "best" to use it since it was introduced in the late 1970s... > > Here's my simple explanation: > > What an Ebow consists of: > > The Ebow is a very simple device consisting of a pickup, an amplifier > and an > output coil. The pickup is essentially the same as an electric guitar > pickup, it uses a coil of wire and a magnetic pole piece. The only > difference is that the coil is wound on a single small round bobbin and > designed only to pick up the vibration of a single string. > > The pickup is connected to a very small amplifier which in turn drives > the > output coil. The amplifier is not very powerful and is easily driven > into > square wave clipping, which is plainly audible in an electric instrument > when the excitation coil is positioned above the instrument's own pickup. > > The pickup coil and output coil are positions at opposite ends of the > "string channel" along the bottom surface of the Ebow's body. > > How an Ebow works: > > The pickup in the Ebow operates exactly the same as the pickup in every > ordinary electric guitar: The string vibrating in close proximity to the > pickup causes fluxuations in the permanent magnetic field around the > pickup's coil. > > These fluxuations in the magnetic field induce a voltage into the coil. > This voltage is amplified and sent to the output coil, which operates in > reverse of the pickup: The voltage sent to the output coil by the > amplifier > generates a changing magnetic field which excites the string. > Since the signal feeding the pickup and produced at the output are from > the > same string a feedback loop is created, allowing the string to ring > indefinitely. > > An Ebow will work on any vibrating magnetic object which is sensitive > enough > to be driven by the relatively weak excitation signal. > > I hope that this clarifies a few things and opens the possibilities for > all > you loopers.. > > -Chuck Zwicky > > > > -- > > ... > http://www.zmix.net > > http://www.esession.com/ChuckZwicky > > http://albumcredits.com/zmix >