MOD 32 even and odd counter using IC 7473

Thread Starter

penotskie

Joined Oct 6, 2007
7
Pls help me.. diagram of a counter using flipflop or ic's that can count up to 31 and the output would be even numbers...
 

Thread Starter

penotskie

Joined Oct 6, 2007
7
Pls help me.. diagram of a counter using flipflop or ic's that can count up to 31 and the output would be even numbers...
 

hgmjr

Joined Jan 28, 2005
9,029
How about if you just build a 0 to 15 binary counter and then always force the least significant bit (Bit0) of the output to be a zero. Bit0 from the 4-bit counter will be Bit1 of the output, Bit1 of the 4-bit counter will be the Bit2 of the output, Bit2 of the 4-bit counter will be Bit3 of the output and Bit3 of the 4-bit counter will be Bit4 of the output.

hgmjr
 

hgmjr

Joined Jan 28, 2005
9,029
This is 5 bits. Bit0 of the output is always the value 0. This insures that the output is even. Then the four bits from the 4-bit counter make up bits 1 thru 4 of the output.

hgmjr
 

hgmjr

Joined Jan 28, 2005
9,029
It is really very straightforward. Build a textbook 4-bit counter the output of which would be as follows

Rich (BB code):
Output of 4-bit counter would look like this:
 
BBBB DEC
3210
----
0000  0
0001  1
0010  2
0011  3
0100  4
...
1100 12
1101 13
1110 14
1111 15
 
The next step would be to append a constant "0" and 
promote the four outputs from the 4-bit counter.
 
BBBB B  DEC
4321 0
------
0000 0  0
0001 0  2
0010 0  4
0011 0  6
0100 0  8
......
1100 0 24
1101 0 26
1110 0 28
1111 0 30
Does that make it clearer?

hgmjr
 

mrmeval

Joined Jun 30, 2006
833
A lot of people come here expecting someone to do their homework don't expect a complete response.

This is available on the main website add more flip-flops, this is a down counter and uses a trick to use less parts so may not be what you need.
http://www.allaboutcircuits.com/vol_6/chpt_7/8.html

This has more complex examples.
http://www.allaboutcircuits.com/vol_4/chpt_11/2.html

I'd recommend getting a good book on digital electronics from your library, even an older one will do.

Ok thanks.. I also need
a diagram so that i can constract it in the workbench,, do you have a diagram for 5bit counter?
 
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