Fire Fly drawing

Discussion in 'The Projects Forum' started by spike1947, Mar 6, 2016.

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  1. spike1947

    Thread Starter Member

    Feb 4, 2016
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    Hi

    I am attaching a drawing for a flickering LED solar charged , I am wanting to change the supply voltage to 2.4v ( from 2 x 1.2v Ni-MH ) and using 2 x solar panels from the pound shop ( giving out 5.6v ! ) , driving a flickering LED 1.8v to 2.2v .

    What would I have to change to obtain my result ! .

    cheers

    spike
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    Possibly put a series charge resistor and diode to drop the excess voltage, and to charge the battery, or use 3.6V.
     
  3. spike1947

    Thread Starter Member

    Feb 4, 2016
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    Hi

    Thanks for your reply , If I use just one of the solar panels , what would I have to change , in the circuit ! .

    Cheers

    Spike
     
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    If the solar panels are 2.8 -3v, then just a diode to drop 0.7v will do to charge them up, ideally the solar panels need to give out 1.5 to 3v more than your nicads..
     
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  5. wayneh

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    Sep 9, 2010
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  6. ScottWang

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    Aug 23, 2012
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