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Pulse Generating Circuit

Discussion in 'General Electronics Discussion' started by sid2286, Jul 3, 2015.

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  1. sid2286

    sid2286

    102
    1
    Aug 24, 2011
    Dear All,

    I want to design a pulse generating circuit to blink an LED continuously as 250ms on time and 250 ms off time(approx) .

    The supply is 3 to 3.6Vdc.

    I think this can be done with comparator but not sure how.

    Kindly please help!

    Thanks
    Sid
     
  2. ramussons

    ramussons

    367
    71
    Jun 10, 2014
  3. sid2286

    sid2286

    102
    1
    Aug 24, 2011
    thanks for your reply,

    I went through the datasheet of CD4047BC. but not sure how to implement it.

    I was to design a circuit such at when the input is 3v, the continuous pulse should generate , this can be achived by giving the input at astable and observing the output at osc pin.

    now, then next concern is I have a tact switch which when once pressed the blinking of LED should stop.
    how should i implement this here with CD4047BC?
     
  4. KMoffett

    KMoffett

    720
    73
    Jan 21, 2009
    Would the the 3V input be a pulse or continuous? If continuous, would the switch stop the oscillator even with the 3V present on the input? I'm thinking a CD4093 configured as a bistable and a gated astable, plus a drive transistor. (never worked with a 4047)

    Ken
     
  5. sid2286

    sid2286

    102
    1
    Aug 24, 2011
    so the condition is as follows:

    1. Input 3V start oscillation (toggle) output i.e. ON/OFF the LED continuously
    2. when switched is press stop the toggling LED if the input is low.
     
  6. KMoffett

    KMoffett

    720
    73
    Jan 21, 2009
    Again, "Would the the 3V input be a pulse or continuous? If continuous, would the switch stop the oscillator even with the 3V present on the input?" ???
    Ken
     
  7. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
    What's the status of this topic? Did you get your answer?

    Chris
     
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