clock signal circuit

Discussion in 'The Projects Forum' started by SonOfAnarchy ZA, Jul 27, 2011.

  1. SonOfAnarchy ZA

    Thread Starter Member

    Jul 13, 2011
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    Hey guys i need to build a clock generator circuit. the problem i have is i need one that i can adjust the rate the signal goes out by using a pot. I'm going to use it for a decade counter can anyone give me a circuit diagram please.:)
     
  2. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    What will be the needed frequency range?
    What output voltage and current do you need?

    Bertus
     
  3. SonOfAnarchy ZA

    Thread Starter Member

    Jul 13, 2011
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    0
    it needs to be anything between 5 and 12v. i dont know the frequency but anything that can signal a decade counted
     
  4. Wendy

    Moderator

    Mar 24, 2008
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    The decade counted doesn't really make sense, are you wanting a freq counter?

    555 Hysteretic Oscillator

    Are you wanting a counter circuit?
     
  5. bertus

    Administrator

    Apr 5, 2008
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  6. SonOfAnarchy ZA

    Thread Starter Member

    Jul 13, 2011
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    i ment decade counter the 4017 im using has a clock input im just looking for a circuit that will signal that clock but i want the circuit to be able to be adjustable so i can control the speed the counter switchs
     
  7. praondevou

    AAC Fanatic!

    Jul 9, 2011
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    Hi, it takes many posts for the people to finally give you the answer you want, because you don't give them enough details.

    If you need an oscillator, its main characteristic, its FREQUENCY needs to be known. If you don't know what frequency, then you should inform at least the frequency range, like 10Hz to 100Hz for example. ;)
     
  8. SonOfAnarchy ZA

    Thread Starter Member

    Jul 13, 2011
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    the problem is i dont know the frequency:rolleyes: when i built the circuit before all i used a switch that put a voltage from a 6v battery the signal goes from -6v to +6v and that switchs the counter once, this time i want it to be automatic switching.
     
  9. Wendy

    Moderator

    Mar 24, 2008
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    Have you read .LEDs, 555s, Flashers, and Light Chasers? It covers what you want.

    Chapter 9, Light Chasers

    [​IMG]
    .................................................. ........................................Figure 9.1

    It covers a lot of ground, there is a very good chance you will find a schematic that does exactly what you want.
     
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  10. SonOfAnarchy ZA

    Thread Starter Member

    Jul 13, 2011
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    thanks that looks great will build it tomorrow and see how it goes
     
  11. Wendy

    Moderator

    Mar 24, 2008
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    The drive of a 4017 is very weak, if you need brighter let me know. You can also replace U3 and R4 with a single resistor. I built this many years ago. I just noticed I chose the 4022 chippie, let me post another schematic. The 4022 is a kissing cousin of the 4017, the 4017 is a decade counter, while the 4022 is a 8 output counter.


    [​IMG]
    .............................................Figure 11.2.................................................. ...................................Figure 11.3

    The first letter in my picture number is the chapter number, so this is from chapter 11. You will need to merge the two schematics.
     
  12. SgtWookie

    Expert

    Jul 17, 2007
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    Oops - Bill's circuit in reply #9 is using a 4022; it's similar to a 4017 but doesn't count as high (8 instead of 10), and the output pin numbers are different. It won't hurt anything, but the LEDs won't turn on in the same sequence if you use a 4017 instead of a 4022 and don't update the output pin numbers first. Also, there will be a couple of clocks where nothing appears to happen.

    To make that circuit work with a 4017 the way it would work with a 4022, make these changes:

    Code ( (Unknown Language)):
    1. Out
    2. Pin 4022 4017
    3. Q0   2    3
    4. Q1   1    2
    5. Q2   3    4
    6. Q3   7    7
    7. Q4  11   10
    8. Q5   4    1
    9. Q6   5    5
    10. Q7  10    6
    11. Q8  NA    9 (connect 15 to 9 instead of gnd)
    12. Q9  NA
     
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