Connect with us

Reading Circuit

Discussion in 'General Electronics Discussion' started by 010101, Jan 4, 2011.

Scroll to continue with content
  1. 010101

    010101

    4
    0
    Jan 4, 2011
    Hi I'm a bit confused about the attached circuit diagram.

    Is only resistor R1 connected to pin 3 of the CMOS and R2 connected to pin 2 and so on? OR are resistors R1 to R4 collectively connected and pins 2, 3, 4, 7 connected together?

    The link to the circuit is http://www.zen22142.zen.co.uk/Circuits/Timing/sqt.htm.

    Thanks!
     

    Attached Files:

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,480
    2,828
    Jan 21, 2010
    The curvy line thingy connecting to pins 2, 3, 4, and 7 indicates a bus. That is, a series of parallel conductors that are grouped together for some reason. They are not connected together.

    At various points it shows what those bus wires are connected to. Each one has 3 connections, a 2K7 resistor, and the anode of 2 diodes. Each place where the bus is shown as going has the pin number and the function in parenthesis.

    Similarly, "Clock" is shown at several points, these are connected together.

    There is a connection shown for pin 16 to supply power to the 4017, and all the ground symbols are connected together and then connected to the -ve side of the battery or power supply (this is not shown -- you are assumed to know)

    I hope this helps, and sorry if I have covered stuff you already know.
     
  3. KMoffett

    KMoffett

    723
    75
    Jan 21, 2009
    The numbers refer to the counter bits of the 4017... the numbers in red inside the IC symbol. "0" (pin 3) connects to R1, D1, and D5. "1" (pin 2) connects to R2, D2, and D6. And so on...! It's like a parallel 4 wire buss. I think it was just to make the schematic simple to draw.

    Ken
     
  4. 010101

    010101

    4
    0
    Jan 4, 2011
    Thanks! I get it now :)

    Regarding the connection for pin 16, am I suppose to get it from between C3 and C4 (there's an arrow with 16 written next to it)

    And...where does clock go to???
     
  5. 010101

    010101

    4
    0
    Jan 4, 2011

    Thanks Ken.
    As I place the components on a breadboard, I can see that this simplified schematic actually has many connections.
     
  6. KMoffett

    KMoffett

    723
    75
    Jan 21, 2009
    Yes the junction of C3 and C4 go to pin 16 on the IC. There are also two connections to pin 14 from R13 and from C5

    Ken
     
  7. 010101

    010101

    4
    0
    Jan 4, 2011
    Thank you KMOffett and (*Steve*)!
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-