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The first electric hearing aid was created in 1898 by Hutchinson to help people with poor hearing by using electric currents to amplify weak signals.
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In 1913, hearing aids were manufactured, and they weren't portable
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Transistors were created in 1948 and they were used to replace the vacuum tube in the first hearing aid and they were just overall better. They needed less battery power, were smaller and had less volume distortion.
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The microprocessor and multi-channel amplitude compression were created in the 1970's. The microprocessor was tiny and was able to be more portable, and the multi-channel amplitude was a more digital breakout to hearing aids.
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Hybrid hearing aids were created by combining the amplifier, filter, signal limiting from the conventional hearing aid and a separate digital piece into a conventional hearing aid case.
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In the 1990's, the first all digital hearing aid was created. It was placed behind the ear. It was only distributed to research centers first, then it was commercially dispersed.
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Only recently, users of iPhones or Bluetooth users in general can use their phones to control their hearing aids and listen to music, podcasts, etc.
