1.5m 3.5mm Stereo Plug To 3.5mm Stereo Plug Lead

History

• The 3.5 mm was originally designed in the 1950s.
• Two-conductor connectors for earpieces on transistor radios and remains a standard still used today.
• This roughly half-sized version of the original.
• Popularized by the Sony EFM-117J radio released in 1964 is still commonly used in portable applications.
• The three-conductor version became very popular with its application on the Walkman in 1979.
• These devices had no speaker of their own so the usual way to listen to them was to plug in headphones.
• Four-conductor versions of the 3.5 mm plug and jack are used for certain applications.
• A four-conductor version is often used in compact camcorders and portable media players which providing stereo sound and composite analog video.
• It is also used for a combination of stereo audio, a microphone, and controlling media playback, calls, volume and/or a virtual assistant on some laptop computers and most mobile phones and some handheld amateur radio transceivers from Yaesu.
• Some headphone amplifiers have used it to connect “balanced” stereo headphones, which require two conductors per audio channel as the channels do not share a common ground.

Reference.

Phone connector (audio)

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