Noise sensing bobbin-coil assembly for amplified stringed musical instrument pickups
First Claim
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1. A noise sensing bobbin-coil assembly for use with stringed musical instrument pickups, the assembly comprising:
- a) a core formed of magnetically permeable material which either minimises eddy current losses or is configured to minimise eddy currents; and
b) a coil of copper wire formed about the core, for generating a noise voltage in order to cancel a corresponding externally induced noise voltage in a stringed instrument pickup with which said noise sensing bobbin-coil assembly is to be associated to a desired extent.
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Abstract
A noise sensing bobbin-coil assembly for use in conjunction with a musical instrument pickup is disclosed. In particular, the bobbin of the bobbin-coil assembly is adapted to resist induced eddy currents thereby allowing a fewer number of coils to be used which in turn reduces undesirable interaction with the musical instrument pickup.
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Citations
27 Claims
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1. A noise sensing bobbin-coil assembly for use with stringed musical instrument pickups, the assembly comprising:
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a) a core formed of magnetically permeable material which either minimises eddy current losses or is configured to minimise eddy currents; and
b) a coil of copper wire formed about the core, for generating a noise voltage in order to cancel a corresponding externally induced noise voltage in a stringed instrument pickup with which said noise sensing bobbin-coil assembly is to be associated to a desired extent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 22, 23, 24, 26, 27)
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18. A guitar pickup which emulates the desired sonic qualities of a Fender®
- Stratocaster®
pickup, the guitar pickup comprising;
a) a string sensing pickup coil having between 3,000 and 8,000 turns of 0.050 mm or 0.056 mm wire formed about one or more permanent magnets extending through dielectric plates; and
b) a noise sensing bobbin-coil assembly underlying the string sensing pickup coil, the assembly comprising;
i) a core formed of thin magnetically permeable steel or ferrite laminations insulated from one another and having laminated end flanges formed integrally with the core laminations and insulated from one another; and
ii) a coil having between 2,000 and 3,000 turns of 0.063 mm or 0.071 mm wire formed about the core and between the end flanges.
- Stratocaster®
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20. A noise-sensing bobbin-coil assembly having a minimised number of conductor turns wound around a magnetically permeable eddy current reducing core, for installation upon a guitar in proximity to a stringed instrument pickup and for connection to an output of the pickup in an out-of-phase configuration in order to cancel externally induced electrical interference in an electrical output from the pickup, wherein the noise sensing bobbin-coil assembly operatively maintains sensitivity to said interference with minimal magnetic interaction with said pickup.
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21. A noise sensing bobbin-coil assembly according to claim, mounted in or on the body of a stringed musical instrument and remote to a string sensing pickup coil of the instrument, and connected in series or parallel with the string sensing pickup or pickups mounted on the instrument for the purpose of cancelling externally induced 50 Hz or 60 Hz hum or noise.
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25. A bobbin assembly comprising a core of fragmented particles of magnetically permeable material for reducing eddy currents in a noise sensing bobbin-coil assembly for cancelling noise in an amplified musical instrument pickup.
Specification