How to turn on one led strip and off another in the same circuit using a trigger

Discussion in 'General Electronics Chat' started by Medic2124, Feb 1, 2015.

  1. Medic2124

    Thread Starter New Member

    Feb 1, 2015
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    How would I make the same circuit for a 12v application? I want to switch between red/white on a LED strip I have.
     
  2. GopherT

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    Nov 23, 2012
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  3. Medic2124

    Thread Starter New Member

    Feb 1, 2015
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  4. GopherT

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    image.jpg

    The output of the 555 is coming in from the bottom of the image.
     
    Last edited: Feb 1, 2015
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  5. LDC3

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    Apr 27, 2013
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    GopherT, is there an input on the left (bottom) of the circuit? Maybe you should elaborate on what the circuit is doing so the OP can understand and expand his knowledge.
     
  6. ScottWang

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    LED with current limit_b1u3sf4n09_ScottWang.gif
     
  7. Reloadron

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    Jan 15, 2015
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    Yes, you can have "fade in" or "fade out" or both. There are several ways to fade LEDs. This is a pretty good little video and circuit demonstration of fade in/out. There are other ways to do it and keep in mind the more features we add to a circuit the more we increase the parts count. Finally and not to leave out micro-controllers, they can also be used to get the effects you want.

    Ron
     
  8. GopherT

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    Again, the signal generator at left would just be the output of your 555 timer. A 1 Hz cycle is shown. You can get slower fade with bigger caps or higher value resistors at the transistor bases.

    The resistor at the signal source must be about 70% of the base resistors (or less) or the LED doesn't turn off completely in this circuit at 1 Hz. If you want a slower signal, then you must build/simulate yourself.

    image.jpg
     
  9. bertus

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