74hc4060

Discussion in 'General Electronics Chat' started by minhle, Jul 6, 2011.

  1. minhle

    Thread Starter New Member

    Jun 1, 2011
    6
    0
    hi everyone,
    the output of 74hc4060 casues a big problem when i use it to drive leds (through 2003). how can i eliminate the ripple, or other way to bring the display under control
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Where is your schematic for your circuit?

    You apparently have a 74HC4060 connected to LEDs via a ULN2003 somehow, but we don't know what you expect to see.

    If there are 'glitches' in the display due to the '4060 not being a synchronous counter internally - well, sorry; you'll need to re-design using synchronous counters.
     
  3. minhle

    Thread Starter New Member

    Jun 1, 2011
    6
    0
    hello,

    thks for your reply, i use a wrong counter. the 74hc4017 is the right 1. but when connect in cascade more than 1 counter, the voltage out put from 4017 drops to 0.5v. so how to keep voltage around 5v as indecated in datasheet .here is the schema
    0.1uf (or more) is attached at every ic input power
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    The 4017 can only have 1 of it's ten D0-D9 (or Q0-Q9) high at a time.

    If you are cascading them as shown in certain applications notes, your 1st 4017 will only have nine available outputs, and subsequent 4017's will only have eight outputs available.

    Take a look at page 15 of this datasheet: http://www.nxp.com/documents/data_sheet/74HC_HCT4017.pdf

    You need to post your schematic so that we can figure out where things are going wrong.
     
    Last edited: Jul 7, 2011
  5. minhle

    Thread Starter New Member

    Jun 1, 2011
    6
    0
    thanks for your reply,
    i m trying to upload my schematic but i do not know how to do so.
     
  6. minhle

    Thread Starter New Member

    Jun 1, 2011
    6
    0
    the circuit is run well (scrolling message display with 6X 4017). but the light is very low.
    can you guide me how to post my circuit (attachment)
     
  7. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
  8. minhle

    Thread Starter New Member

    Jun 1, 2011
    6
    0
    YES, thanks for your help.
    i save the filw as word doc. about .png i do not know i will try to up load if this 1 cannot be read.

    thank again
    regards
     
Loading...