Patent ID: 6980931

Claim:
A device for providing electrical isolation comprising a first and second miniature audio earphone, each further comprising: (1) a voice coil comprising leads with two ends, wherein the leads of the first miniature audio earphone are not electrically connected to the leads of the second miniature audio earphone, (2) a permanent magnet in proximity to the voice coil, (3) a ferromagnetic diaphragm which will vibrate in response to sound waves, causing a change in a magnetic flux of the permanent magnet resulting from the change in the distance between the diaphragm and the magnet which induces a current in the voice coil, the ferromagnetic diaphragm further being caused to vibrate when the voice coil is energized, wherein the two miniature audio earphones are affixed together after the ferromagnetic diaphragm of the first miniature audio earphone has been removed, and with the ferromagnetic diaphragm of the second miniature audio earphone in close proximity to the voice coil of the first miniature audio earphone, so that when a varying electrical signal is passed through the leads of the first miniature audio earphone, the remaining ferromagnetic diaphragm is caused to vibrate, thereby inducing a current in the leads of the second miniature audio earphone.