Flexible Printed Coil for Stringed Instruments

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Traditional inductive pickups, such as those used in electric guitars, feature one or more permanent magnets surrounded by a wire coil. String vibrations cause the electromagnetic field to oscillate and induce a voltage in the stationary coil. The electric signal generated is then carried to a power amplifier and speaker. Unfortunately, the wire coils in the pickup often produce undesired feedback and need to be potted with wax or a polymer. In addition, manufacturing the coils involves winding copper wire, with the diameter of a human hair, around thousands of turns, which makes the process tedious, time consuming, and difficult to produce coils with identical shape and sound.

Researchers at Purdue University have developed a flexible, printed circuit board that emulates the wire coils of a traditional pickup. A conditioning circuit is also in place to ensure that the output signal matches that of a traditional pickup, but with greater sound quality and reliability. By eliminating the coil, the weight of the pickup is reduced and the manufacturing process is greatly simplified.

-Reduces undesirable feedback
-Greatly reduces weight of pickup
-Can be used in a larger range of stringed instruments
-Simplifies and reduces cost of manufacturing process

Potential Applications:
-Electrical Industry
Sep 9, 2014
Utility Patent
United States
Mar 1, 2016

Sep 11, 2013
United States
Purdue Office of Technology Commercialization
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