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To Short or not to Short- that is the question

Discussion in 'General Electronics Discussion' started by SparkyCal, Jun 22, 2020.

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  1. SparkyCal

    SparkyCal

    216
    6
    Mar 11, 2020
    Can someone help me interpret this schematic below

    My question relates to Pins 2, 3 and 4 on the 555 Timer.

    Does this schematic require that Pin2 be shorted to Pin 3 and pin 3 be shorted to Pin 4?

    I am thinking not but I am not sure.

    Thank-you
     

    Attached Files:

  2. dave9

    dave9

    899
    229
    Mar 5, 2017
    No, if connected together there is a round dot joining them.
     
  3. Nanren888

    Nanren888

    246
    49
    Nov 8, 2015
    In this style of diagram, only dotted crossovers are connections.

    BTW: the unlabeled input on the flipflop [from 55 pin 3, to "tact" momentary pressbutton] is probably labeled "CLK" or clock on the data, pin-out.
     
  4. SparkyCal

    SparkyCal

    216
    6
    Mar 11, 2020
    Thanks guys. Just learning about flip flops. I breadboarded this tonight but it failed. Likley because it is not well labeled in certain spots. I'll try what you suggested Naren888
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

    10,025
    2,138
    Nov 17, 2011
    Which type of JK-FF did you use? Which pins did you connect? Show us an annotated complete schematic diagram.
     
  6. SparkyCal

    SparkyCal

    216
    6
    Mar 11, 2020
    I need to re-do this. I did it while tired and rushed and that probably accounts for thre failure. if it fails again, when i re-do it, i will post it

    Thank-you
     
  7. bertus

    bertus Moderator

    683
    237
    Nov 8, 2019
    Hello,

    You will encounter different types of schematics.
    These pictures show the difference between the old method and the new method for drawing a schematic crossing:

    dots in a schematic.png

    This can be confusing, so take a good look wich method is used.

    Bertus
     
    TCSC47 and Harald Kapp like this.
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