Patent ID: 9633637
Date: 2017-04-25
CPC Classifications: G01H,G10D,G10G

Claim:
1. A tuning device for a stringed instrument, said tuning device comprising: an electromagnetic pickup separate from the stringed instrument, wherein the electromagnetic pickup has a magnetic field; and an output connector configured to provide an electrical signal indicative of a movement of a string of the stringed instrument within the magnetic field of the electromagnetic pickup; a first coil comprising a first bobbin and a first winding wound in a first direction around the first bobbin, said first coil having a start lead connected to a beginning of the first winding and an end lead connected to an ending of the first winding, wherein the first coil has a top and a bottom; a second coil comprising a second bobbin and a second winding wound in the first direction around the second bobbin, said second coil having a start lead connected to a beginning of the second winding and an end lead connected to an ending of the second winding, wherein the second coil has a top and a bottom; a magnet having a first magnetic pole emanating from a first face of the magnet and a second magnetic pole emanating from a second face of the magnet, wherein the first magnetic pole is opposite the second magnetic pole, the first face is opposite the second face, and the magnet has a third face connecting the first face to the second face; a first pole piece extending from the top of the first coil to the bottom of the first coil, wherein the first pole piece is positioned adjacent the first face of the magnet as the first pole piece extends beyond the bottom of the first coil; and a second pole piece extending from the top of the second coil to the bottom of the second coil, wherein the second pole piece is positioned adjacent the second face of the magnet as the second pole piece extends beyond the bottom of the second coil.