No, I used the previous one(not the 7404 one) because I didn't have a 7404. Could I just make an inverter for that?

Also, I'll put that pull-up resistor in because I got the whole thing set up but it is having very confusing problems(emphasis on the 's'). I'll come back tomorrow and tell you how it went.

 

No, I used the previous one(not the 7404 one) because I didn't have a 7404. Could I just make an inverter for that?

Q1 (in the Transistor version) is an inverter, so you shouldn't need anything else to feed the 7438. By the way, how many the 7438's Gates are you using? After all, there are 4 of them in that chip.

 

@Shortbus Because I need both waves exactly as I drew them(IE the second wave needs to follow directly behind the rising edge of the square wave). Unless that's what that is, in which case: Thanks, but I got it working with CDrive's way.

shaqywacky - Yes it should make the wave you want, look at this thread I started; http://forum.allaboutcircuits.com/showthread.php?t=44757

I'm using bills circuit to drive this circuit; http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/104501-does-work.html

Also it dosen't need inverters to do the job.

Glad you got your circuit working, was just trying to give another way of doing it.

 

@CDrive Oh, ok. What do I give the second input of the NAND gate?

Right now I'm using 6 7438's(IE 24 NAND gates), 4 for the 2-bit full adder and 2 for the 4 flip-flop's. I have 25 7438's, so my circuit could have 100 NAND gates, but I don't think it would fit.

I put the pull-up resistor in but it's still not working correctly

@Shortbus I misread your other post. Yours would work for me but sense I already have it set up the other way, I'll just leave it. Thanks though.

 

We have never seen you're complete circuit, so this is fast becoming a futile exercise. Honestly, the circuit I gave you will produce a negative going pulse that's capable of driving a TTL input, so I don't know what more I can do. A Scope is essential for this kind of work. Without one you're going to spin your wheels. Do you have one?


BTW, I didn't want to know how many 7438 chips you have on the board. I wanted to know if the chip receiving the negative going pulse had a spare gate. If it did, or another 7438 nearby did,... you could use it to replace Q1 to produce a negative going pulse.

Personally, I don't think that that will help you either because the transistor circuit you have should work, but you have problems that only you know.

 

What you gave me worked perfectly. When I said it didn't work right, I meant the entire project I was working on.

I'm pretty sure I've found where the problem is but I don't think I know enough to be able to tell what exactly is causing it. I would ask here but I don't think I'd learn anything, I would just get an answer. I've decided to just continue going through all the volumes on this website.