not gate

Discussion in 'The Projects Forum' started by sai150, Jan 25, 2015.

  1. sai150

    Thread Starter New Member

    Jan 25, 2015
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    i need a not gate circuit can anyone help me?
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. MaxHeadRoom

    Expert

    Jul 18, 2013
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    A normally closed switch or push button, simple!
    [​IMG]
    Max.
     
  4. Reloadron

    Active Member

    Jan 15, 2015
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    Might help if you shared what you need it for. Small detail, like what are you trying to do? You have provided absolutely no information?

    Ron
     
  5. sai150

    Thread Starter New Member

    Jan 25, 2015
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    actually i'm working on a project
    i want a not gate circuit to invert output from a 555 timer
     
  6. MaxHeadRoom

    Expert

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    2n7000, 2n2222.
    Max.
     
  7. bertus

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  8. Reloadron

    Active Member

    Jan 15, 2015
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    If you just want to invert the output of a 555 timer I would just use a simple transistor as Max suggested. Just about any small switching transistor will work. Here is a simple example:

    Transistor Inverter.png
    Note Vout is inverted from Vin.

    Ron
     
  9. crutschow

    Expert

    Mar 14, 2008
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    If you want to use a logic gate, a CD4049 inverter would also work and requires only a single part.
     
  10. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    What are you driving with the 555 output? With a typical load drawing less than the rated 555 output current, instead of connecting the load between pin 3 and ground you can connect it between pin3 and the positive supply rail.
     
    GopherT likes this.
  11. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    As Alec said above, connecting to v+ inverts your signal. See below...

    image.jpg image.jpg
     
  12. sai150

    Thread Starter New Member

    Jan 25, 2015
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    thanks a lot guys
     
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