LED Circuit

Discussion in 'The Projects Forum' started by selbycruz, Sep 3, 2012.

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  1. selbycruz

    Thread Starter New Member

    Aug 7, 2012
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    First things first - I am a novice, but I can usually figure things out. However, my knowledge on electronics is limited. O.K. - I bought 8 LED bulbs on the 'net, Chinese made. The package said good for 120 - 240 volt. All bulbs blew out in a couple days. Deconstructing one bulb, I found this circuit board (attached). I did check the resistors and diodes (which were good), but couldn't test the capacitor. In testing the LED's (which are in series), one was bad. I replaced it, and the bulb lasted one day. So, it seems to me that the voltage and/or amperage may be over powering the LED's. Circuit seems to be a simple one - line going to 620 ohm resistor then to bridge rectifier, load going to 470kohm resistor, with 10 μf, 250 volt capacitor and 510 ohm resistor in parallel with load lines to LED's. It is a 37 LED bulb in series. The unknown is what the specs are on the LED's. My question is - since I'm using these on a 120 volt circuit, can anyone tell me if the LED's might be overdriven?
    Thanks
     
  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    Your written schematic leave something to be desired.
    Try to post a schematic, preferably as a .png file, but .pdf or .doc will work.
     
  3. #12

    Expert

    Nov 30, 2010
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    Ron...TOS. Mods have been notified.
     
  4. Ron H

    AAC Fanatic!

    Apr 14, 2005
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  5. absf

    Senior Member

    Dec 29, 2010
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    I have plenty of those working on 230V and they dont give me any problem.
    We can get them easily in our supermarkets.

    Allen
     
  6. bertus

    Administrator

    Apr 5, 2008
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    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:
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    Bertus
     
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