door lock

Discussion in 'The Projects Forum' started by cjacobs, Mar 17, 2011.

  1. cjacobs

    Thread Starter New Member

    Dec 8, 2010
    I am wiring an urmet door entry system with a 12 volt dc power supply and the coil on the latch is also 12 dc. Every time the latch receives power it makes a clicking sound every few moments. Can anyone advise please thank you.