Dropping 1 in 3 10v pulses

Discussion in 'The Projects Forum' started by Tdit, Oct 8, 2012.

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  1. Tdit

    Thread Starter New Member

    Oct 8, 2012
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    Hello all!

    I'm trying my hand at building something I can buy off the shelf.

    Simple project, but I'm having a lot of trouble working it out.

    Objective:
    Drop one in theree 10v pulses received from "input", and deliver the resulting 66% of "input" to "output". I would like to achieve this without loosing voltage, but I can drop the output to 7 volts if need be.

    Operating power:
    10volts "input" approximately.
    7 to 10volts "output"
    Wattage: <0.5W

    I would rather build than buy - if only from the learning experience. If someone could point me in the right direction I would greatly appreciate it.

    Cheers and thanks!
     
    Last edited: Oct 8, 2012
  2. MrChips

    Moderator

    Oct 2, 2009
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    Drop the "automotive application" and you're ok.
    Say "I need a circuit that will reduce an input frequency by 66%"
     
    Tdit likes this.
  3. MrChips

    Moderator

    Oct 2, 2009
    12,421
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    You can divide the input frequency by three using a divide-by-3 counter.
    Then you can multiply the signal by two using a frequency doubler or a phase-locked-loop.
     
  4. alexfreed

    Member

    Oct 8, 2012
    72
    10
    Unless you need equally spaced pulses, a PLL is clearly an overkill. The easiest solution is probably to use a CD40xx chip that is happy with 10 V power to build a modulo 3 counter.
    Either a dedicated counter or 2 flip-flops will do. A power MOSFET can act as a switch enabling the input 10 V pulse to the output. One out of 3 states of the counter will disable the switch.
     
  5. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
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    Does it run at a fixed frequency or over a range of frequencies?
     
  6. Tdit

    Thread Starter New Member

    Oct 8, 2012
    6
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    hi thanks for your question;

    The input will be over a range from 0 to 200 pulses per second.
     
  7. Tdit

    Thread Starter New Member

    Oct 8, 2012
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    I want to thank everyone for their input and quick responses! Really appreciate it!

    I'm going to research the suggestions and see what I can put together. I'm a hobbiest in electrical engineering only, so I work a tad slower than most ;)
     
  8. Tdit

    Thread Starter New Member

    Oct 8, 2012
    6
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    Hi, really appreciate your suggestion, although I can't view your pics. Maybe cos I'm new =)

    If I use a db3, how would i then step it back up to twice that rate? I need to reduce the original by 33%, leaving 2 out of 3 pulses in tact.
     
  9. Tdit

    Thread Starter New Member

    Oct 8, 2012
    6
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    This sounds good - and I even think it's inside my skill level =) I'll do some research on the components =)
    Thank you =)
     
  10. Tdit

    Thread Starter New Member

    Oct 8, 2012
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    I recall the cd4023(?) being mentioned during some earlier research, but there was some drawback that prevented it being used in my application. I'm going to revisit that option and do more reading!

    Thank you =)
     
  11. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    The thread has been running to long already.
    It is unfair to hide the automotive application.

    I am closing this thread as it violates AAC policy and/or safety issues.

    Quote:
    6. Restricted topics. The following topics are regularly raised however are considered “off-topic” at all times and will results in Your thread being closed without question:

    • Any kind of over-unity devices and systems
    • Automotive modifications
    • Devices designed to electrocute or shock another person
    • LEDs to mains
    • Phone jammers
    • Rail guns and high-energy projectile devices
    • Transformer-less power supplies
    This comes from our Tos:
    Terms of Service
    There will be enough sites where automotive questions can be discussed :
    Member selected automotive forums

    Bertus
     
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