# clock signal circuit

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

1. ### SonOfAnarchy ZA Thread Starter Member

Jul 13, 2011
33
0
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.

Apr 5, 2008
17,127
3,001
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
33
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
21,012
2,745
The decade counted doesn't really make sense, are you wanting a freq counter?

555 Hysteretic Oscillator

Are you wanting a counter circuit?

Apr 5, 2008
17,127
3,001
6. ### SonOfAnarchy ZA Thread Starter Member

Jul 13, 2011
33
0
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
2,939
489

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
33
0
the problem is i dont know the frequency 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
21,012
2,745
Have you read .LEDs, 555s, Flashers, and Light Chasers? It covers what you want.

Chapter 9, Light Chasers

.................................................. ........................................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.

SonOfAnarchy ZA likes this.
10. ### SonOfAnarchy ZA Thread Starter Member

Jul 13, 2011
33
0
thanks that looks great will build it tomorrow and see how it goes

11. ### Wendy Moderator

Mar 24, 2008
21,012
2,745
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.

.............................................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
22,194
1,764
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