A Brief Guide of the 2.5mm Cable
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2.5mm cables are considered the smallest of the phone connectors: (and by phone, we&re referring to audio found in headphones, phonographs, and phones).
The use of 2.5mm cords has become far less common than ever, yet there are certain devices that still use them for various tasks! In some circumstances, the best option to meet your unique needs might be to buy an adapter that allows you to use one device in conjunction with another. Perhaps all you need is a 2.5mm cord!
2.5mm was the original standard size used in phone headset, back when everyone used landlines. The slightly larger 3.5mm is the standard for music devices (ie. headphones and speakers), and is what most of us are familiar with with in contemporary electronics. The substantially larger 1/4 inch cords are used by professional musicians, and was previously used by switchboard operators at the phone company to place calls.
Modern phone connectors are available in three standard sizes. The original 1â„4 in (6.35 mm) phone connector, used by manual switchboard operators, dates back to 1878 -- it may be the oldest electrical connector standard still being used today! The 3.5 mm and 2.5 mm sizes were originally developed for earpieces on transistor radios. All three sizes are now readily available.
Where can you find them? All over, including the following devices: telephone headsets; earphones/headphones; cordless phones and mobile phones; two-way radios; microphone inputs on tape/cassette recorders; DC power connector on some cassette players; serial port connectors for data transfer and unit programming in TI-83 calculators, and as TTY devices, which allow the hearing-impaired to communicate by phone by typing messages (a TTY is required at both ends of the phone call to work).