LED lights when its not supposed to

Discussion in 'General Electronics Chat' started by aconz2, Feb 10, 2010.

  1. aconz2

    Thread Starter New Member

    Feb 8, 2010
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    I am in the process of repurposing a circuit I found in a solar lawn lam. The circuit turns on two LEDs when it is dark. The original circuit used a solar panel to charge a battery and removed the solar panel to use standard batteries and I plan on powering it from an outlet eventually but I must figure this out first.

    When a battery is inserted, the LEDs glow faintly and then when the light sensor is supposed to switch them on, they light up full power. First, I would like to know why this is. Second, there is a spot on the board for a R2 that was never there, could this be affecting it but I don't think so because it functioned fine without it originally. Third, what is the green bodied 'resistor' looking thing.

    Thank you so much for any help.

    Notes for the pictures:
    It is very possible the drawing is incorrect and I left the solar panel in the drawing but during testing I did not have it.

    The gray wires are what the LEDs are attached to
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    The green bodied devices is an inductor.

    If you have identified the colors correctly then it is probably a 120 microHenry in value.

    hgmjr
     
  3. aconz2

    Thread Starter New Member

    Feb 8, 2010
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    Thanks for that bit of info hgmjr.
     
  4. hgmjr

    Moderator

    Jan 28, 2005
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    Is there a readable part number on U1?

    hgmjr
     
  5. aconz2

    Thread Starter New Member

    Feb 8, 2010
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    Yes it is ANA608.
     
  6. hgmjr

    Moderator

    Jan 28, 2005
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    Is that same part number visible on the body of the device?


    hgmjr
     
  7. aconz2

    Thread Starter New Member

    Feb 8, 2010
    16
    0
    Yes it has ANA608 on the body and 68236 written below that

    I also found this link on a very similar if not identical circuit from another forum
     
  8. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    I have about 26 solar garden lights. Many were free from my electrical utility company.
    Nine of them slowly fade from red to green to blue. They all use discrete transistors in the voltage stepup converter.
    Usually the cheap ******* (I am not allowed to say where they were made) NI-Cad cell fails within one year then I replace it with a much better name-brand Ni-MH cell.
     
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