Transducer for a stringed musical instrument
A string-vibration transducer for an electric, stringed instrument that provides effective noise or hum cancellation while retaining single-coil tone. The transducer includes a permanent magnet, at least two ferromagnetic metal poles, a coil that is configured to loop around the at least one ferromagnetic metal pole, and a bottom flatwork comprising at least two apertures to receive the at least two ferromagnetic metal poles, wherein the permanent magnet comprises a north magnetic pole and a south magnetic pole, wherein the at least two ferromagnetic metal poles are configured to be displaced on top of the permanent magnet and through the at least one aperture on the bottom flatwork, wherein the coil is configured to loop around the at least two ferromagnetic metal poles to comprise two loops in a shape of figure eight, and wherein the bottom flatwork is configured to be on top of the permanent magnet.
1. A string-vibration transducer for an electric instrument having strings comprising:
two permanent magnets;
at least two ferromagnetic metal poles;
a coil that is configured to loop around the at least two ferromagnetic metal poles; and
a bottom flatwork comprising at least two apertures to receive the at least two ferromagnetic metal poles,
wherein each permanent magnet comprises a north magnetic pole and a south magnetic pole,
wherein the at least two ferromagnetic metal poles are configured to be displaced on top of the permanent magnets and through the at least two apertures on the bottom flatwork,
wherein the coil is configured to loop around the at least two ferromagnetic metal poles to comprise two loops in a shape of figure eight, and
wherein the bottom flatwork is configured to be on top of the permanent magnets.
2. The transducer of claim 1 , wherein the permanent magnet associated with the first loop of first ferromagnetic metal pole is magnetically polarized opposite to the permanent magnet associated with the second loop of second ferromagnetic metal pole.
3. The transducer of claim 2 , wherein the first ferromagnetic metal pole is arranged within the first loop of the coil such that the first ferromagnetic metal pole and the first loop of the coil have same magnetic polarity.
4. The transducer of claim 2 , wherein the second ferromagnetic metal pole is arranged within the second loop of the coil such that the second ferromagnetic metal pole and the second loop of the coil have same magnetic polarity.
5. The transducer of claim 1 , wherein the bottom flatwork comprises a non-metallic plate.
6. The transducer of claim 1 , wherein the at least two ferromagnetic metal poles are configured to transfer the magnetic field of the permanent magnets through their length.
7. The transducer of claim 1 , wherein the at least two ferromagnetic metal poles are cylindrical in shape.
8. The transducer of claim 1 , wherein the at least two ferromagnetic metal poles are made from at least one of: ALNICO II, ALNICO III, ALNICO V, ALNICO VIII, mild steel, of any combination thereof.
9. The transducer of claim 1 , wherein the permanent magnets comprise a pair of adjacent rectangular magnets, magnetized through the thickness, such that the magnetic fields face the strings.
10. The transducer of claim 1 , wherein the permanent magnets are configured to be underneath the two loops of the coil.
11. The transducer of claim 1 , wherein the coil has between 1,000 to 9,000 turns.
12. The transducer of claim 1 , wherein the coil has more than 9,000 turns.
13. The transducer of claim 1 , wherein the coil has less than 1,000 turns.
14. The transducer of claim 1 , wherein the coil has about 6,000 turns.