Electronic – What does this symbol on the box of power supply mean
power supplysymbol [~]
I always see this symbole behind electronic devices.
A close-up image of the symbol:
What does it mean?
Best Answer
Negative on the outside of the barrel connector, positive on the inside of the barrel connector.
It is the standard method of showing the polarisation of the barrel connector. The positive pin is usually (as in this case) the inner contact, and negative is usually the outside of the barrel.
If you look at the image, it shows a surrounding area labelled "-", an inner point, which it labels with a "+". Hence, negative surround, positive inner contact.
It's a kind of datecode. The mold for the plug actually has a small part that can be rotated with a screwdriver, to point the arrow at different numbers around the perimeter of the circle. They do this to either indicate a new month of manufacture, or perhaps a revision number.
Note the 1 and the 3 on either side of the arrow. In this case, it's a datecode indicating the third month of 2013. Once a month, they rotate the arrow, and once a year, they replace the rotating part altogether with one for the next year.
It looks like a solder bridge. Sometimes there can be a jumper that you need to put, sometimes it is just two very close pads that you join with a blob of solder.
Best Answer
Negative on the outside of the barrel connector, positive on the inside of the barrel connector.
It is the standard method of showing the polarisation of the barrel connector. The positive pin is usually (as in this case) the inner contact, and negative is usually the outside of the barrel.
If you look at the image, it shows a surrounding area labelled "-", an inner point, which it labels with a "+". Hence, negative surround, positive inner contact.