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Oscillating pulse to stable

Discussion in 'General Electronics Discussion' started by Sree, Feb 16, 2016.

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  1. Sree

    Sree

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    Dec 11, 2015
    I want to know how I can change an oscillating current (i.e. from an NE555 output) to a stable continuous DC
     
  2. AnalogKid

    AnalogKid

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    Jun 10, 2015
    There are many ways to do this, depending on what you mean by "stable". What is the application?

    ak
     
  3. duke37

    duke37

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    Jan 9, 2011
    A diode to pass the peak voltage to a capacitor may do all that you require. Much more detail is needed to give more advice.
     
  4. BobK

    BobK

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    Jan 5, 2010
    Why would you want to turn the output of the oscillator to a. stable DC voltage? It sort of defeats the purpose.

    Do you mean you want a DC voltage that varies with the frequency or duty cycle of the oscillator?

    Bob
     
  5. Martaine2005

    Martaine2005

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    May 12, 2015
    Apart from what others have suggested, in particular Bobk "defeats the object", I would suggest not using a 555 at all or bypass the one you have.
    But as others have said, what exactly do you want to do?

    Martin
     
  6. Sree

    Sree

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    Dec 11, 2015
    Now the pulse is 555 1.png I Want it to

    555 2.png
     
    Last edited: Feb 17, 2016
  7. cjdelphi

    cjdelphi

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    Oct 26, 2011
    Feeding the output to a capacitor and then placing a small load like a resistor... this will slowly flat line but not instantly

    Depending on voltage, you could use a linear regulator after passing the 555 output to the capacitor 7805 for example from a 555 9v source
     
  8. Alec_t

    Alec_t

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    Jul 7, 2015
    Ground the Reset pin (4).
     
  9. BobK

    BobK

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    Jan 5, 2010
    This makes absolutely no sense. If what you want is a constant DC voltage, use a voltage divider from the power supply. Why would you use a 555 timer to produce a constant DC voltage?

    What is it you are trying to do?


    Bob
     
    Last edited: Feb 17, 2016
    Martaine2005 likes this.
  10. KMoffett

    KMoffett

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    Jan 21, 2009
    Sree,

    Is this somehow related to your other threads? buzzers/delays/555? It really helps if you tell us what your overall goal/project is.

    Ken
     
    Last edited: Feb 17, 2016
    Martaine2005 likes this.
  11. Martaine2005

    Martaine2005

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    May 12, 2015
    Hi Ken,
    This probably has something to do with other threads!
    I sometimes wonder if they keep secrets in case somebody pinches their idea :rolleyes:.
    As Bob said, there is no point.!
    What next? A johnson counter that doesn't count!

    EDIT: What you want is a dead 555 timer....That should do the trick..:p

    Martin
     
    BobK likes this.
  12. Sree

    Sree

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    Dec 11, 2015
    Hi ken
    Actually I need a Delayed buzzer for my motorbike
    I tried all different ways as you all suggested and a part of it will work as I aimed
    So,why I am asking the doubts about the failed parts
    I Know nothing about electronics, only have some ideas
    No, I completed almost my project using a 555 ic(using dutycycle). It will give me a 1 sec pulse after a delay of 15 seconds. That is what I need
    But, now the problem is the current from the turn signal is blinking type. To power up the IC when the turn signal on and to cut off the power when the turn signal off, I need a solution. That I asked you actually.
     
  13. Alec_t

    Alec_t

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    Jul 7, 2015
    If I've understood correctly I think this should do what you want, assuming the blinker provides 12V pulses.
    Each blink pulse switches on Q1 to discharge C1. While C1 voltage is low, M1 conducts to supply 12V to your 555 circuit. When blinking stops, C1 charges up to 12V via R1 and M1 turns off.
    Component values aren't critical. M1 can be almost any P-channel MOSFET rated for >20V.
    Any low-power NPN transistor should do.
    555_supply.PNG
     
  14. Sree

    Sree

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    Dec 11, 2015
    Dear alec
    I formed a virtual circuit as you described in the post, but unfortunately it is not working
    Please help me to correct the circuit
    Virtual circuit link is http://www.falstad.com/circuit/circ...44+0 w+400+144+432+144+0 w+128+192+112+192+0
     
  15. Alec_t

    Alec_t

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    Jul 7, 2015
    Last edited: Feb 24, 2016
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