AC powered LED light

Discussion in 'The Projects Forum' started by bosoko, Feb 10, 2013.

Thread Status:
Not open for further replies.
  1. bosoko

    Thread Starter New Member

    Feb 10, 2013
    3
    0
    Hello, I bought some bright powerful LED's peak-rated at 2W each and I want to run them off AC. I decided against regulator circuits because of the cost and/or complexity (if I were to build one) so I thought of another design using caps for limiting current.

    Here's the basic circuit:

    As safety precautions I plan to add a fuse before the circuit and MOhm-rated resistors in parallel with caps so there's no residual voltage. The D1 diode is probably redundant, but I put it there with the idea of blocking wrong-way voltage on the LED's.

    I haven't built it yet (it works in simulations goo .gl\W0zRi (Falstad's circuit simulation applet)) and I would be happy to receive criticism and warnings before I do build it and it melts my face.
     
    Last edited by a moderator: Feb 10, 2013
  2. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    I am closing this thread as it violates AAC policy and/or safety issues.

    Quote:
    6. Restricted topics.

    The following topics are regularly raised however are considered “off-topic” at all times and will results in Your thread being closed without question:

    • Any kind of over-unity devices and systems
    • Automotive modifications
    • Devices designed to electrocute or shock another person
    • LEDs to mains
    • Phone jammers
    • Rail guns and high-energy projectile devices
    • Transformer-less power supplies
    This comes from our Tos:
    Terms of Service

    Bertus
     
  3. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    I have seen your email.
    This is mainly an educational forum, that why we do not allow anything directly connected to the mains.
    If you use a transformer to isolate and reduce the voltage, the circuit may be OK.
    For a led a couple of volts may be enough (depending on the specifications).
    It is never wise to connect leds to AC, as the led can not have a backwards voltage of more than 5 Volts.

    Bertus
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    I have seen your email again.
    Why do you insist on using AC for powering leds?
    Better use a DC power supply with the correct current limiting circuit for the led.

    Have a look at Bill_Marsdens thread on leds:
    http://forum.allaboutcircuits.com/showthread.php?t=19074

    Bertus
     
Loading...
Thread Status:
Not open for further replies.