AC-LED circuit problem 1.6V instead of 3

Discussion in 'The Projects Forum' started by smilem, Nov 17, 2010.

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  1. smilem

    Thread Starter Active Member

    Jul 23, 2008
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    Hi, I'm trying to power a LED for a switch as indicator.
    The switch is 230AC 3 pins, and indicator must be mounted away from the switch.

    I have simulated this circuit I found elsewhere and in simulation it works fine, except in real world I get only 1.6V and LED is very dim.

    Any ideas? all parts are like in simulator resistors are 1/2W
     
  2. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
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    Transformer-less LED drivers can be very dangerous. Best to use a cheap wall wart.
     
  3. smilem

    Thread Starter Active Member

    Jul 23, 2008
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    Yes I know about the dangers.
    Well this is for use as indicator light that an appliance is on (LaserJet printer, YES HP forgot to put ON/OFF switch), I could use neon light but I want to use LED. The LED is better because low voltage at the LED side, and it looks better instead of flickering neon. Besides I already have all parts.
     
  4. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    Be aware you can be killed trying this.

    Use X1 rated/type caps for fail safe in the event you want to go forward, but a neon lamp would be a better solution.

    This thread will be most likely locked due to rules.
     
  5. smilem

    Thread Starter Active Member

    Jul 23, 2008
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    The wires running to LED are not 230Volts so it's safer than having a neon lamp with 230V am I not correct? Everything will be encased inside a printer, if you did not know printers run on 230V so it will not be more dangerous putting this led inside than it already is.

    But I can't seem to get required 3V.
     
  6. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    If you are using it as an indicator in a laser printer, look for a low voltage to connect the led.
    We do not want leds connected directly to the mains.

    Bertus
     
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