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555 timer

Discussion in 'General Electronics Discussion' started by benjaminpetrus, Dec 20, 2014.

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  1. benjaminpetrus

    benjaminpetrus

    6
    0
    Dec 20, 2014
    must pin 3 have power when only pin 1 and 8 are conecte
     
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,268
    Nov 28, 2011
    Hi there and welcome to Electronics Point :)

    I don't understand your question.

    Pin 3 is the output. It drives something, like an LED, a speaker, a relay, etc.

    Pin 8 is the positive power pin, also called VCC. Pin 1 is the negative power pin, also called GND or 0V. You need to connect a power source (5~15V DC) between those pins to make the 555 work.

    You also need to connect most or all of the other pins.

    Google 555 circuits for examples of how to use it.
     
  3. benjaminpetrus

    benjaminpetrus

    6
    0
    Dec 20, 2014
    Hi thanks
     
  4. benjaminpetrus

    benjaminpetrus

    6
    0
    Dec 20, 2014
    I can't get the 555 to work. It stays on .i have disconect all wires. Only vcc and ground are conected and still pin 3 have power. I have changed it with 3 other 555 and still its doing the same. So I was wondering if it must be like that
     
  5. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,268
    Nov 28, 2011
    Post a full schematic. If you don't have EDA software, draw it on paper and take a photo of it. Show all pins, all components and all off-board connections.

    Also upload a photo of your construction.
     
    Arouse1973 likes this.
  6. Circuit Basics

    Circuit Basics

    2
    0
    Apr 3, 2015
    Here's an article I wrote explaining the 555 timer from a beginners perspective if you're interested. There are example circuit
    diagrams and theory explained as well:
    http://www.circuitbasics.com/555-timer-basics-monostable-mode/
     
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