A little light project

Discussion in 'The Projects Forum' started by sikter, Feb 14, 2012.

  1. sikter

    Thread Starter New Member

    Jan 25, 2012
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    I would like to make a circuit which consists of:
    -one light bulb (or LED)
    -one momentary switch,
    -power supply ( anything from 1,5 to 12V DC)
    -anything else I need to do following

    When I push my momentary switch the light would go ON.
    Next time I push it, the light would go OFF.

    thanks
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Momentary has only one state.

    U need a single throw or a push button switch.

    So what else do you need to complete ur light project, a diagram ?
     
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  3. Wendy

    Moderator

    Mar 24, 2008
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    I have a simple 555 project that does this.

    The 555 Projects

    555 Bistable Multivibrator

    Don't worry about the two LEDs, just remove one of them. It is to show when the chip is high or low, digitally speaking. This circuit would also work with light bulbs.
     
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  4. sikter

    Thread Starter New Member

    Jan 25, 2012
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    Yes, maybe diagram with explanation...
    (But remember this project doesn't include a latching switch)
     
  5. mcasale

    Member

    Jul 18, 2011
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    Sounds like a JK flip-flop would do it.
     
  6. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
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    ...or a mechanically latching momentary pushbutton switch?

    Oops - just noticed latching switches were a no-no
     
  7. Wendy

    Moderator

    Mar 24, 2008
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    I suspect something like the circuit I showed is used for a lot of applications. It used a momentary contact switch, and is fairly simple.

    I also suspect we won't hear from the OP again. Time will tell.
     
  8. sikter

    Thread Starter New Member

    Jan 25, 2012
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    I just want to thank you again!
    Your links really helped me a lot! That was
    what I was looking for. Still reading the other stuff.
    Sikter
     
  9. Wendy

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    Mar 24, 2008
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    Naw, but I would like feedback when you are finished. It is too easy to make assumptions when you've done it for decades, it doesn't hurt to get fresh input now and again.
     
  10. sikter

    Thread Starter New Member

    Jan 25, 2012
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    Hello Mr Marsden,
    I found this video on youtube! It looks very simple but I am afraid that I didn't understand everything the guy said.

    http://www.youtube.com/watch?v=g870KeaHtEQ

    Please comment!

    sikter
     
  11. Wendy

    Moderator

    Mar 24, 2008
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    Forget what he said, look at what he did. This was a simple push button circuit. The LED lights when he pushed the button, goes dark when the button is released. Very basic circuit.

    It is +5VDC, resistor, LED, button. Extremely simple.

    He is using a laptop USB for 5VDC.
     
  12. sikter

    Thread Starter New Member

    Jan 25, 2012
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    Ok I see,
    Waste of time, actually.
    I saw a lot of videos what includes relays (which I really want to avoid)
    555s seam to be most simple solutions.

    Many people have mentioned a flip-flop solution but I couldn't find out how they worked.
    Would you mind?
     
  13. Wendy

    Moderator

    Mar 24, 2008
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    Did you notice the theory of operation on the bottom link article? If there are part of it that are not clear please ask the specifics.

    This is not your normal flip flop. Matter of fact, it is extremely round about, using the dead space between the hysteretic gates set points. It is unusual to say the least, but it works.

    Most flip flops use inverting gates of some sort, that is more the norm.
     
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  14. sikter

    Thread Starter New Member

    Jan 25, 2012
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  15. Wendy

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    Mar 24, 2008
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    It looks like it would work.

    Side note, you were looking at a buck puck lighting the LED. These devices are not pololu switches, which is the simple toggle similar to the 555 circuit I showed.

    Google buck puck. They are neat devices. If you have a 9V battery (say, 3X LM1131 celles) and the LED needs 3.6V at 700ma the 9V source will provide 290ma. This is because they are converters. They are also not cheap, nor is the power LED (3W).
     
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