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The phone connector was invented for use in telephone switchboards in the 19th century and is still widely used. In its original configuration, the outside diameter of the "sleeve" conductor is 1⁄4 inch (exactly 6.35 mm). The "mini" connector has a diameter of 3.5 mm (approx. 1⁄8 inch) and the "sub-mini" connector has a diameter of 2.5 mm (approx. 3⁄32 inch).
If a two-conductor plug of the same size is connected to a three-conductor socket, the result is that the ring (right channel) of the socket is grounded. This property is deliberately used in several applications, see "tip ring sleeve", below. However, grounding one channel may also be dangerous to the equipment if the result is to short circuit the output of the right channel amplifier. In any case, any signal from the right channel is naturally lost. If a three-conductor plug is connected to a two-conductor socket, normally the result is to leave the ring of the plug unconnected (open circuit).
originally posted by: EnigmaAgent
My cell phone has a different size of headphone socket. Cant remember what the dimentions are tho.
originally posted by: signalfire
Start saving up for hearing aids now. Using headphones so much will add up to major hearing damage over time, even if you don't crank the volume. Your ears weren't designed for this. All it takes is one exposure to an extra-loud sound, and damage is done, and it's cumulative. Having it right up against your ears like that guarantees volume overload, if only accidentally once in a while.
And I'm not talking hearing aids at 80, but at 40.