The gold coil is a fine copper wire around a gold core. It produces an effect solely due to the release of copper ions. These pickups have an extremely clear tone and a soft, spongy feel.
The magnetic construction of the gold coil is unique. Gold coils are packaged in humbucker housings, and fit into standard humbucker ring openings. They are a perfect match with bridge humbuckers.
In this study, we used the gold coil to evaluate the influence of microcoil designs on the spatial extent of cortical activation. This is an important step toward the development of next-generation cortical prostheses.
The gold coil was fabricated by etching gold patterns on a 50-mm-thick silicon substrate. Wet etching followed by deep reactive ion etching was used to form the gold trace. Coils were then mounted on the silicon substrate and insulating layers were deposited.
An e-field was generated by a sinusoidal current delivering to the coil. The E-field is uniform along the length of the wire loop. Field gradients were calculated with MATLAB software and plotted on a two-dimensional (two-dimensional, or 2D) plane 15 mm above the coil. As shown in Figure 7, peaks in the field gradients occurred at the sharp bends of the coil.
Fluorescence responses were also evaluated. The magnitude of fluorescence changes was slightly lower than the electrical response. For both the V and W-coils, the fluorescence decreased with distance. However, the peak fluorescence levels tended to decrease more rapidly for the W-coil.
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