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Switching 500W load and LED

Discussion in 'LEDs and Optoelectronics' started by Donwan, Mar 1, 2013.

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  1. Donwan

    Donwan

    8
    0
    Feb 28, 2013
    I am looking to set up a circuit that switches between two loads each 500W

    I am looking to have an LED to show when the circuit is switched to Load B.

    I cannot remember if the LED acts as a current limiter when in series or parallel
     
  2. Electrobrains

    Electrobrains

    259
    5
    Jan 2, 2012
    The LED has a function of voltage limitation. You cannot use it for current limitation.

    If you just want to indicate that your 500W load is switched on, then you could put your LED parallel to the load with a resistor (limiting the current) in series with the LED. Maybe you also need a diode in series with the LED (to protect it) if you have AC voltage.
     
  3. Donwan

    Donwan

    8
    0
    Feb 28, 2013
    Thanks for response

    Is this the correct circuit (attached)

    Where would the diode be required to protect the LED
     

    Attached Files:

  4. Electrobrains

    Electrobrains

    259
    5
    Jan 2, 2012
    Be aware of that your LED (and other components) must nor be touchable.
    You need at least 3mm isolation distance (better 5.5mm) to metal parts connected
    anywhere to the power line voltage (also Neutral).

    [​IMG]
     
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