fault finder indicator

Discussion in 'The Projects Forum' started by sharivan, May 25, 2013.

  1. sharivan

    Thread Starter New Member

    Mar 17, 2013
    pls need help...
    how can i be able to detect or shall i say im planning to make an open circuit detector/indicator? its like if ever i pull out one among 10 leds in parallel, buzzer is triggered then buzzes... im asking for suggestions or hints

    pls im having a hard time thinking about this need help T.T
  2. wayneh


    Sep 9, 2010
    Is that what you really want to do, to detect one (or more) out of 10 being removed? It's going to be a little tricky because you'll need to detect a drop in total current of just 10% of the normal value. You could have a more elaborate system that monitors each LED circuit individually but it's hard to imagine why you would do that.
  3. #12


    Nov 30, 2010
    If you remove an LED, the voltage on its power feed pin will go high. You can use that voltage to trigger a driver for the buzzer.