about optocoupler

Discussion in 'General Electronics Chat' started by kfyew, Nov 12, 2008.

  1. kfyew

    Thread Starter New Member

    Nov 12, 2008
    hi, can anyone tell me , why some machine are using optocoupler card to control the machine tower light .
  2. mik3

    Senior Member

    Feb 4, 2008
    The use optocouplers because they need to protect (isolate by means of no electrical contact between the two circuits) the control circuit by any unwanted voltages which may arise on the output. With optocouplers these high voltages can not interfere with the control circuit and destroy it unless they exceed a limit of course.