# Electronic Circuits and Projects Forum

1. ## Need help with homework

I need help designing a gate function generator for a lab experiment and am having problems doing so is there somewhere i can look for an example or one that is already done?This is the problem i am trying to solve.
implement a chip function detector that is able to
detect if the tested chip has the function of NAND (7400), OR(7432), AND(7408) or
XOR (7486) gates.
I can either wire it on a breadboard with some ics or i can use the PLD quartus 2 that we have available.

2. Maybe just pont me in the right direction would also help i am completely lost on this.
Thanks.

3. Originally Posted by 05gpgt2
Maybe just pont me in the right direction would also help i am completely lost on this.
Thanks.
hi,
The first thing you should do is work out the Truth table for each of those gates.

They all have two inputs and one output.

Call the inputs A and B, the output X [ or C of you prefer]

The OR gate is easy.

A B X
0 0 0
1 0 1
0 1 1
1 1 1

You do the others yourself and post your tables, we will give more Hints.

4. Are you allowed to use µpc or other programmable devices, or are you strictly bounded to logic gates, counters, flipflops and so on?

5. 74xx series logic ICs are extremely old. I first learned about DTL logic when RTL logic ICs became obsolete.
I threw away my TTL cookbook about 32 years ago and have used Cmos logic ICs ever since.
Why don't teachers use newer Cmos?

6. Originally Posted by audioguru
Why don't teachers use newer Cmos?
Since I've being there as a student, I have the grand answer to that:
Students that does kill cmos ic's by static electricity makes an expenditure over time. And to reduce the cost, the school decides to go for TTL ic's instead, since the chance is less that a student kill it compared to a cmos.

My teacher said so

7. I have used thousands of Cmos logic ICs without a grounding wrist-strap and in winter in my part of Canada the static electricity is awful. Not one IC was damaged.

I think students "blow Up" electrolytic capacitors and ICs by connnecting the power supply polarity backwards ON PURPOSE!

8. Deleted Off Topic.
Moderation.

9. Deleted Off Topic.
Moderation.

10. Deleted Off Topic.
Moderation.

1234 Last »
 Tags
 Similar Threads Thread Starter Forum Replies Last Post Need help with my homework on Resistance & Inductance series circuit dougbndr Homework Help 2 9th February 2012, 10:37 AM Need help with Intel Assembly Language and PIC16F877 avinsinanan Microcontrollers 10 4th March 2008, 10:02 AM I need help with a door bell cobby_13 Electronic Projects Design/Ideas/Reviews 3 2nd March 2003, 05:55 AM Need Help with a project ? Gar1 Electronic Projects Design/Ideas/Reviews 6 29th January 2003, 04:25 PM still need help with halogen dimmer!!! jtleo1 Electronic Projects Design/Ideas/Reviews 1 26th January 2003, 08:32 AM
Electronic Circuits  |  Learning Electronics

Join our community with over 100,000 Members! It's free, easy and when you're logged in you have many more features! Click to register.
Page Time: 0.11964 seconds      Memory: 7,675 KB      Queries: 16      Templates: 0