NE555 configuration

Discussion in 'General Electronics Chat' started by Eudécio Gabriel, Mar 31, 2019.

  1. Eudécio Gabriel

    Thread Starter New Member

    Jun 24, 2018
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    I already have a NE555 connected properly in my breadboard in astable configuration. I want to generate a pulse with a period equal to 0.1 seconds. What values of resistances should I use given that I have a 100nF capacitor.
     
  2. killivolt

    Distinguished Member

    Jan 10, 2010
    618
    896
    Check this out......

    NE555
     
  3. dl324

    AAC Fanatic!

    Mar 30, 2015
    8,208
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    Since you've selected a capacitor value, calculating period is straightforward. Just remember to consider component tolerance.
     \small t = 1.1RC => R = \frac{t}{1.1C}

    Or you can use this graph from the datasheet for quick approximations:
    upload_2019-3-31_10-5-53.png upload_2019-3-31_10-10-50.png

    There's a typo. There is no RB.

    EDIT: cleaned up tex block.
     
    Last edited: Mar 31, 2019
  4. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    7,832
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    Try 910K ohms....
     
  5. Audioguru

    Expert

    Dec 20, 2007
    10,969
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    First you said you built an NE555 astable that is a continuously running oscillator. Then you said you want to generate "a pulse" which is a triggered monostable NE555 circuit. The monostable circuit is shown above.
    What will trigger your monostable? It must be a momentary pulse to 0V to pin 2.
     
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