# homework problems:

Discussion in 'Homework Help' started by infinitig35, Mar 4, 2008.

1. ### infinitig35 Thread Starter Member

Mar 3, 2008
25
0
Good morning all. I have several homework problems that I would like some input on. I have attached the questions below. Thanks for all your help.

2. ### infinitig35 Thread Starter Member

Mar 3, 2008
25
0
hmmm, somehow my attachments did not work. I gues the file size is a liitle too big. Let me try again.

File size:
172.8 KB
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27
File size:
188.6 KB
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22
3. ### recca02 Senior Member

Apr 2, 2007
1,211
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For some of the question google is your friend, for the rest it would be better if you posted your attempt at it first.

4. ### S_lannan Active Member

Jun 20, 2007
247
2
yeah, you have to tell the guys what is confusing you. there are plenty of sites that will offer to solve homework sheets for money. but if you wanna learn....

5. ### infinitig35 Thread Starter Member

Mar 3, 2008
25
0
The title of this section is "homework help" right? Why u guys giving a hard time? There are 20 questions and I answer them all except for these couple that I posted here.

6. ### Dave Retired Moderator

Nov 17, 2003
6,960
145
Can I ask all members to keep answers constructive. Anyone is free to ask questions for help.

As for you questions:

17 - see http://www.geocities.com/sujoymukherjee_82/file1/digitalclk.pdf

18 - see http://www.allaboutcircuits.com/vol_4/chpt_11/3.html it should give you sufficient to deduce the answers. You may need to do a little think for b)-d).

14/15 - see http://www.allaboutcircuits.com/vol_4/chpt_8/6.html for worked examples of this type of question. Have a go and post up your answers - it is a long time since I did any Karnaugh mapping but I'll be happy to check for you.

16 - Where f = 1 write down the boolean expression, for example the first two are AB'C' and A'BC' (where ' denotes NOT) - there are two others. Then in your truth table put a 1 where the conditions are true, for example the above first of the two above expressions will have a 1 where AB = 10 and C = 0 (i.e. AB'C') and the other will have 1 where AB = 01 and C = 0 (i.e. A'BC').

Clearer?

Dave

7. ### infinitig35 Thread Starter Member

Mar 3, 2008
25
0
Wow Dave, really appreciate all your help. I think I can figure out the answers from what you've provided me. Again, thanks alot.

Nhat

8. ### infinitig35 Thread Starter Member

Mar 3, 2008
25
0
Hey Dave, I have just 1 more question. What is one method of changing a count up type of asynchronous counter to a count down type of asynchronous conter?
This should be the last one. Thanks alot Dave.

Nhat

Mar 3, 2008
25
0