Danavox Model 562 Eyeglass Hearing Aid
The Danavox Model 562 eyeglass hearing aid was manufactured by Danavox
International A/S of Copenhagen, Denmark in 1956.
The Danavox 562 needed both temple pieces to house all the
electronics. Thus, it could only aid one ear, in this case, the left
ear.
This hearing aid had 4 transistors.
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Unlike the thick temple pieces of other eyeglass hearing aids, the
Danavox 562 had regular-sized temple pieces. Thus, from the front and
side, it looked like the person was just wearing regular eyeglasses. You
only saw the difference from the back.
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Seen from the back, the Danavox 562 eyeglass hearing aids had large
behind the ear "ear hooks" to house all the electronics.
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The serial number was engraved on the inside of the right temple piece.
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View of the back of the Danavox 562 eyeglass hearing aid showing the
volume control on the "shoulder" of the right temple piece.
The hole on the side near the bottom of the right temple piece is the
microphone port.
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Rear view of the left temple piece showing the on/off switch on the
"shoulder" of the temple piece. It is in the "on" position.
The round brass plate on the inside of the left temple piece is the
battery door.
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The spring-loaded battery door kept the 675 mercury battery securely in
place. Having the battery door on the inside was unusual for eyeglass
hearing aids.
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Another unusual feature of the Danavox 562 eyeglass hearing aids was the
placement of the "nubbin" to which was attached the ear mold tube.
Normally the nubbin was on the temple piece just ahead of the ear. The
Danavox 562 placed it at the bottom front of the left temple piece.
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Since the electronics were housed in both temple pieces, there needed to
be two wires connecting them to pass the signals from one side to the
other. Since wires would eventually break at the hinges from all the
folding (besides being conspicuous), they used two "pins" and "plate"
contacts instead.
Notice the two rounded pins sticking out of the temple piece on the
right.
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The eyeglass frames contained the two brass "plate" contacts (left).
When the eyeglasses were worn, the pins were held tightly against the
plate contacts.
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The wires were concealed in the frames, but to get across the
nose-piece, they used an ingenious method. The brass nose-piece/brass
tube above the nose-piece was one conductor. The other conductor had to
have been a wire inside the brass tube.
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