building a simple circuit

Discussion in 'The Projects Forum' started by lenski, Nov 2, 2007.

  1. lenski

    Thread Starter New Member

    Nov 2, 2007
    6
    0
    can anyone help me build a circuit. also provide the electronics i need as well as a diagram. I have a open momentary switch that closes a circuit dry that gives one closure per push. i need that output to give me 3 quick rapid outputs. if adjustable in nanoseconds per output that would be helpfull. I have 1.5 volts dc low low amp supply i can use or i can use a aux power supply. this circuit has to be small as possible.

    thank you
    len
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
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    What is meant by "close a circuit dry?"

    Which output is "that output?"

    By "adjustable in nanoseconds" do you mean "very very quickly auto adjusting" or "adjustable pulse width in a range of several nanoseconds," or "adjustable pulse repetition rate in a range of several nanoseconds?"

    What have you tried so far?

    What is your end application?
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The proposal might be more interesting to somebody if an offer of payment was made. It sounds as if you are going to take credit for the design and mechanization (which is well beyond a hobby interest), so payment seems entirely in order.
     
  4. lenski

    Thread Starter New Member

    Nov 2, 2007
    6
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    you got to be kidding this is a simple circuit i am trying to do this with a chip not with relays. money, payment this is not what this form is about. how dare you tell me that i am going to take credit for something, this is project for my son. also you are a moderator spend time reading Dave's message on posting instead of insulting good people and children projects. you job is to help, explain, guide not to discredit good people. if this question was posted wrong follow daves guide lines, not insult people.

    this post of yours beenthere is out of line and as a moderator help people don't falsely accuse without merit.

    len
     
  5. recca02

    Senior Member

    Apr 2, 2007
    1,211
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    no need to get agitated,
    if u need assistance answer Mr thingmaker3's queries.
    it wud be better if u post ur work so far so that members can point out possible flaws.
     
  6. GS3

    Senior Member

    Sep 21, 2007
    408
    35
    A pulse generator with a counter would work but may be a tad complex. A 555 monostable givin a pulse of T duration and opening a gate for another astable 555 oscillator running at 3X the frequency so that 3 pulses get through might also work. I can't think of anything simpler.
     
  7. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    I am interested in learning what is dictating the need for nanosecond resolution in your application.

    A rough sketch of what you have in mind would help move the discussion along.

    hgmjr
     
  8. lenski

    Thread Starter New Member

    Nov 2, 2007
    6
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    a dry circuit is a circuit that has no voltage or power running through it.
    nanoseconds something less then a second. i would like to have 3 pulses in less then a second.
    if i had a momentary switch that connected to a chip that on closure dry or wet (power or no power) that activated a gate in the chip that produced 3 pulses regulated or not ( time wise that is nanosecs. ). is there a chip that can do this.
     
  9. GS3

    Senior Member

    Sep 21, 2007
    408
    35
    That makes no sense. If nothing is running through it then there's no way to know if the switch is open or not. I found
    Ok, I get the idea. A switch controlling an electronic input would be more than adequate.
    Wait a minute! There are 1,000,000,000 nanoseconds in one second. If you want three pulses in less than a second then each pulse can be something like 100,000,000 nanoseconds. You need to be more clear on what it is you need.
    As I said, I can think of some simple ideas that might work but your requirements are not quite clear so it is difficult to say what exactly might be what you need.
     
  10. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    Advertising and product names (e.g. Ipod Nano) have led many in the general public to think that nano means small. As GS3 pointed out, it actually has a specific numerical meaning.
     
  11. recca02

    Senior Member

    Apr 2, 2007
    1,211
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    funny, in engg we come across nano so often it is 10^-9 of the unit it is attached to wonder how a single marketing product be so confusing.
     
  12. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
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    For Len:
    Okay. How about each push of the button resulting in three pulses of 0.125 seconds duration, one every 0.25 seconds. We can throw in an adjustment to change pulse frequency and duration together. Will that fit the requirements for this project?

    For the experts:
    If so, could one rig a 555 with adjustable frequency, and gate the clock into a divide-by-three counter via a gate? Gate would in turn be controlled by a latch triggered by the switch? Borrow or carry from the counter would reset the latch?
     
  13. lenski

    Thread Starter New Member

    Nov 2, 2007
    6
    0
    close a momentary switch any voltage and get 3 quick pulses ( open and close (pulses) ) from that on one closure of the momentary switch.

    len
     
  14. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    When you say "any voltage," do you mean

    1) don't really care about what size battery we use, but will always use the battery eventually chosen

    2) must run from different power sources in a given range (if so, please give the range!)

    or

    3) must work from any power source from scant millivolts to ungodly megavolts

    ?
    :confused:
     
  15. lenski

    Thread Starter New Member

    Nov 2, 2007
    6
    0
    yes that do fine, for voltage, low draw battery voltage is fine 1.5 volt aa. the circuit you described would be fine. that's all i need.

    thank you,
    len and son
     
  16. RiJoRI

    Well-Known Member

    Aug 15, 2007
    536
    26
    The smallest circuit would probably be an 8-pin microcontroller. The next smallest (and easier to build without a uC programmer) would be a 556 IC, with one half controlling the second half, which would actually give the three pulses.

    Still interested in the project??
    --Rich
     
  17. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
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    The miscommunication was resolved to the satisfaction of Beenthere, Dave, and Lensky a while back. Off topic posts have been removed by me.
     
  18. lenski

    Thread Starter New Member

    Nov 2, 2007
    6
    0
    have you given any thought on my project. i understand a 556 ic will work
    in duel mode will this give me what i need. i so can u explain the circuit that i will need i have the pin arrangements.

    len and son
     
  19. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Folk are probably getting tired of my linking to Tony Van Roon's website, but he's got the best 555 tutorial I've come across so far: http://www.uoguelph.ca/~antoon/gadgets/555/555.html

    You can make half of the 556 an astable with frequency of (for example) 10 Hz and 50% duty cycle. You can make the other half a monostable with a period of (for this same example) between 0.25 and 0.30 seconds. Tie the output of the monostable to the reset of the astable. Trigger the monostable with your pushbutton. While the monostable output is high, the astable will run.
     
  20. ashokcp

    Active Member

    Mar 8, 2007
    50
    2
    I guess the 'nanoseconds' resolution requirement, which puzzled me too, which made the project really sophisticated, and, for some special application which ought to be commercial. Only after someone explaining, I realised that iPod nano has redefined the meaning of 'nano' to lots of people differently!
     
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