Author |
Message |
Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
|
Posted: Tue Jul 03, 2007 4:47 am Post subject:
A basic flip flop using dual input AND gates? |
|
|
Does anyone know how to make a basic flip flop using dual input AND gates? Needs to run at up to about 5Khz. _________________ What makes a space ours, is what we put there, and what we do there. |
|
Back to top
|
|
|
EdisonRex
Site Admin
Joined: Mar 07, 2007 Posts: 4579 Location: London, UK
Audio files: 172
|
Posted: Tue Jul 03, 2007 5:01 am Post subject:
|
|
|
ANDs or NANDs? If I remember my logic correctly you could build damn near anything with NANDs, but it's not so easy with ANDs. _________________ Garret: It's so retro.
EGM: What does retro mean to you?
Parker: Like, old and outdated.
Home,My Studio,and another view |
|
Back to top
|
|
|
EdisonRex
Site Admin
Joined: Mar 07, 2007 Posts: 4579 Location: London, UK
Audio files: 172
|
Posted: Tue Jul 03, 2007 5:06 am Post subject:
|
|
|
Here's one using NAND gates.
You can lose the clock detector on the bottom if you want a real basic flip flop. _________________ Garret: It's so retro.
EGM: What does retro mean to you?
Parker: Like, old and outdated.
Home,My Studio,and another view |
|
Back to top
|
|
|
Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
|
Posted: Tue Jul 03, 2007 5:07 am Post subject:
|
|
|
Yeah, it could be NANDs.
I'm only using one AND, so I could replace that with two NANDs and have two left over for the flipflop hey? _________________ What makes a space ours, is what we put there, and what we do there. |
|
Back to top
|
|
|
Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
|
|
Back to top
|
|
|
blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
|
Posted: Tue Jul 03, 2007 5:36 am Post subject:
|
|
|
As long as the input pulses don't overlap it will work. _________________ Jan
also .. could someone please turn down the thermostat a bit.
|
|
Back to top
|
|
|
Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
|
Posted: Tue Jul 03, 2007 5:45 am Post subject:
|
|
|
They won't overlap.
If they did, would it fry or just get grumpy? _________________ What makes a space ours, is what we put there, and what we do there. |
|
Back to top
|
|
|
Dave Kendall
Joined: May 26, 2007 Posts: 421 Location: England
Audio files: 3
|
Posted: Tue Jul 03, 2007 5:51 am Post subject:
|
|
|
Hi Uncle.
dunno if this helps, but the "memory module" in this circuit uses a 4081 to give 4 latches.
I built one a while back, and it does work, although the key down reset time may be too slow for your purposes....
It's an interesting circuit though, sort of like a poor man's 74C922 without the "data available" output
cheers,
Dave
(with too much time, and not enough money) |
|
Back to top
|
|
|
EdisonRex
Site Admin
Joined: Mar 07, 2007 Posts: 4579 Location: London, UK
Audio files: 172
|
Posted: Tue Jul 03, 2007 6:08 am Post subject:
|
|
|
Uncle Krunkus wrote: | They won't overlap.
If they did, would it fry or just get grumpy? |
It's just get grumpy. That's the latch circuit there, so you'd get inconsistent states if you overlap the input pulses. _________________ Garret: It's so retro.
EGM: What does retro mean to you?
Parker: Like, old and outdated.
Home,My Studio,and another view |
|
Back to top
|
|
|
doctorvague
Joined: Mar 14, 2007 Posts: 281 Location: new mexico
Audio files: 2
|
|
Back to top
|
|
|
EdisonRex
Site Admin
Joined: Mar 07, 2007 Posts: 4579 Location: London, UK
Audio files: 172
|
Posted: Tue Jul 03, 2007 1:54 pm Post subject:
|
|
|
doctorvague wrote: |
Good link, thanks! |
I can't take credit for that link. I found it within these forums.
But it is a good link _________________ Garret: It's so retro.
EGM: What does retro mean to you?
Parker: Like, old and outdated.
Home,My Studio,and another view |
|
Back to top
|
|
|
Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
|
Posted: Thu Jul 12, 2007 6:24 am Post subject:
|
|
|
I just learned that you can't use two NAND gates to create an RS Latch unless the inputs are normally "1" and you want it to latch on "0"s
The situation is fixed by using NORs, which, in the same configuration, make an RS Latch which has inputs normally at "0".
This causes me a pain, as I was hoping to create a simple RS Latch and an AND gate from one chip. The numbers just don't add up. Can't be done. _________________ What makes a space ours, is what we put there, and what we do there. |
|
Back to top
|
|
|
|