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First steps..

Discussion in 'Electronic Basics' started by Jim, Oct 31, 2005.

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  1. Jim

    Jim Guest

    Hi Folks,

    After spending ages dreaming about it, I've eventually taken my first
    steps into the world of electronics by building this circuit

    http://www.albinobrainchiggers.com/2005/10/my-jack-o-led.html

    I've been out to buy all the bits, and figured out the schematic and
    built it, and guess what? It works like a treat! yippee.. I can't wait
    for my next project...

    I'm learning as I go, and i appreciate that copying other peoples work
    is perhaps not the best way forward, but there is one question that it
    bugging me...

    The circuit I've built is essentially three separate and independent 555
    timer circuits linked only by the power rails. I'm powering it using a
    (pretty weak) 9v battery. I would expect that when all the LED's are
    lit together they would be slightly dimmer because of the drain on the
    battery, but the opposite is true. When an LED comes on, any LEDs that
    are already on get a bit brighter.. It's mad, I don't understand why.
    any ideas?

    thanks,

    Jim
     
  2. Dan Hollands

    Dan Hollands Guest

    If in fact the only link is the power rails that must be where the
    interaction is ocurring.

    To prove it run the power and ground for each circuit directly back to the
    power source so the athe the current for only one circuit goes thru any
    power wire.

    Dan

    --
    Dan Hollands
    1120 S Creek Dr
    Webster NY 14580
    585-872-2606

    www.QuickScoreRace.com
     
  3. The schematic shows no power connections for the 555. Did you connect
    pins 1 and 8 to anything?
    http://cache.national.com/ds/LM/LM555.pdf
     
  4. JeffM

    JeffM Guest

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