Whats the pinout for this jack?
Audio Connector – Pinout for 3.5mm Female Audio Jack
audioconnectorpinout
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I always use this standard here, that its the same the Nokia and Apple use:
With this schematic, I think that maybe the pins 2 and 3 can be shorted when the jack is inserted.
The schematic of a typical coaxial (barrel type) power jack looks like this:
In that schematic view the pin numbers correspond as follows:
Pin 1 - SLEEVE TERMINAL
Pin 2 - SHUNT TERMINAL
Pin 3 - TIP TERMINAL
Looking at the power supply cable end the terminals in correspondence are:
The SHUNT terminal serves as a switch terminal that opens (for most jacks) when the plug is inserted into the jack. It can be used for products that have both a battery for portable power and a wall wart for wired power. The SHUNT can be used to disconnect the battery from the load when the wired power is plugged in.
You will need to look closely at your actual wall wart power supply to see whether the TIP terminal is V+ or V-. These days it is common for the TIP to be V+ as shown in my schematic view above but the supply may be the opposite polarity as well. That is the reason it is advisable to add the series polarity protection diode (see schematic again) so that if someone tries to plug in a negative TIP wall wart that it will not fry the electronics in the device.
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Best Answer
The connector nearest the socket is ground. The connector farthest from the socket is the centre pin. The one in the middle is... you guessed it. But you are probably aware of that.
That accounts for three of the surface mount pins. The fourth forms a single-pole switch contact to the centre pin connector. When there is no plug, the two contacts meet. But when you plug in the male, it pushes the centre contact up, breaking the connection to the fourth pin, which is now open circuit. This can be used by the electronics to wait until the male is pushed home before activating, thus helping to protect a sensitive input circuit from damage during insertion or removal.