Interesting Information about antique Electrical Hearing Aids

Hearing aid technology took a great step forward with the introduction of the body-wearable Acousticon and similar carbon-type electrical aids. Substantial amplification was now available, although don’t think about Hi-Fi. These instruments used a carbon microphone or microphones connected in series with a battery, a magnetic earphone and a variable resistance. The resistance was used…

New High-Fidelity Hearing-Aids

Familiar audio amplifier design, and the use of Rochelle-salt-crystal mikes and ear-units, combine to produce a good sideline item for servicemen. Radio technique at long last has come to the aid of the hard-of-hearing. The audio amplifiers that constitute such an essential element in radio reception have been refined to meet the particular needs of…

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