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Wanna make a LED flash. Should I use RadioShack Flasher LED or a LM3909?

Discussion in 'Electronic Basics' started by NoMailPlease, Jun 11, 2004.

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  1. NoMailPlease

    NoMailPlease Guest

    I want to make a very simple flashing LED for my car that runs off a few
    1.5v batteries (or 9v if necessary). I've seen the RadioShack flashing LED
    but I'm currious if the the flashing speed can be adjusted. Can it? If so,
    how is this done.

    If the speed is fixed and I gotta build my own circuit, what's the modern
    day replacement for the LM3909? This looks like a nice and simple package
    but I can't seem to find the LM3909 anymore.

    Thanks for your help
     
  2. cpemma

    cpemma Guest

    All-in-one flashing leds are fixed frequency, though it may vary a bit with
    supply voltages 9V-12V. There are 3-lead flasher chips around, M34-1 & M34-2
    for example, but again they're fixed frequency (1Hz & 2Hz for those). For
    variable, RS will sell you a 555 and a few passives.
     
  3. NoMailPlease

    NoMailPlease Guest

    Beautiful. The M34-1 looks like exactly what I want. This makes things so
    easy.

    Thanks for your help!
     
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