Discussion in 'General Electronics Chat' started by ATB1976, Nov 14, 2012.

  1. ATB1976

    Thread Starter New Member

    Nov 14, 2012
    I have been working on an intercom system installation and once installed have found that the transformer / control point has a 18.5v DC output when it is supposed to have an output of 8v - 9v DC. I have since discussed this with the supply company and they have sent a replacement which is the same. The supplied door locks / entry systems are rated at 8 - 12v and they keep burning out. Can anyone recommend anything to reduce the supply voltage. I have considered resistors but the current is unknown at this point and am concerned they could burn out. Any ideas welcome thanks.
  2. spinnaker

    AAC Fanatic!

    Oct 29, 2009
    Your going to need to supply a schematic of the power supply, if you want people to help.

    Is this just a walwart supply? If that is so then that is your answer.