DC power jack pins

Discussion in 'The Projects Forum' started by sportsfan27, Mar 17, 2009.

  1. sportsfan27

    Thread Starter Active Member

    Jan 29, 2009
    43
    0
    What do the pins refer to in a DC power jack (such as this)
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    1 is the ring, 3 is the tip, and 2 is the N/C (normally closed) contact. The + symbol indicates that the tip should carry a positive voltage referred to the ring.
     
  3. sportsfan27

    Thread Starter Active Member

    Jan 29, 2009
    43
    0
    So pin 1 is -, 2 is ground, and 3 is +?
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    No, the ring will be circuit ground. The 2 - 3 contact is to establish a circuit in the absence of the power plug. There is no firm rule as to the usage of the contact closure.

    In fact, you are free to use the jack in any way that makes sense to you in a circuit. The jack can carry a signal instead of power.

    Here is a link to the plug end - yours will be the TS plug - http://en.wikipedia.org/wiki/TRS_connector.
     
  5. sportsfan27

    Thread Starter Active Member

    Jan 29, 2009
    43
    0
    Ok thanks-DC inputs are much more different than an AC input.
     
  6. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    No.
    It is not a stereo jack. It does not have a ring.
    1 is the sleeve.
    3 is the tip.
    2 is connected to 3 without a plug and 2 disconnects from 3 when there is a plug.
     
  7. sportsfan27

    Thread Starter Active Member

    Jan 29, 2009
    43
    0
    What about this type?
     
  8. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Similar, except 3 is a male center pin, and 1 contacts the sleeve.
     
Loading...