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3mm 1.5V bright LED

Discussion in 'Electronic Repair' started by Man-wai Chang, Oct 28, 2011.

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  1. Is there such a toy?

    --
    @[email protected] You have the right to remain silence.
    / v \ Simplicity is Beauty! May the Force and farces be with you!
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    http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
     
  2. bw

    bw Guest

  3. Yes if you use a 1.5V blocking oscillator. I want one that has the (over?) driver built into the LED... :)


    --
    @[email protected] You have the right to remain silence.
    / v \ Simplicity is Beauty! May the Force and farces be with you!
    /( _ )\ (Fedora 15 i686) Linux 3.0.4
    ^ ^ 13:36:02 up 11 days 17:42 0 users load average: 0.01 0.02 0.05
    ä¸å€Ÿè²¸! ä¸è©é¨™! ä¸æ´äº¤! ä¸æ‰“交! ä¸æ‰“劫! ä¸è‡ªæ®º! è«‹è€ƒæ…®ç¶œæ´ (CSSA):
    http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
     
  4. You could use this simple circuit to work down to <<1V --


    FB = OUT for Red

    FB = GND for Green/Blue/White
    |
    .----------.
    Vin 0.8V minimum | FB |
    10uH | |
    ___ | L6920 | LED
    o----+---UUU----|LX OUT|----+->|---+
    + | | | | |
    --- | | | |
    --- | REF | | .-.
    47uF | '----------' | | |
    | | + | |
    GND 100n --- --- '-'
    --- 47uF --- |
    | |
    GND GND GND


    All the parts can be tiny SMT components. Reduce the 47uF caps to 22uF
    and use 0805 22uF/6.3V ceramics and an 0805 inductor to reduce size,
    and the 100n can be an 0402.


    Best regards,
    Spehro Pefhany
     
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