Maker Pro
Maker Pro

How to using a JK flip-flop to build a 7 segment display ?

Hello,
I'm currently got a course work required design a 7 segment display by
using a JK flip-flop to build a numbering countdown minimun with 1
digit.

I'd like to know is, what is the way or how i do design the circuit,
now i no any idea to design it..
i don't have any idea right now, so please help me please...
(sorry for my parlance or using sentence wrongly.. i also very
hardworking to learn English )

Thanks.
 
H

Homer J Simpson

Jan 1, 1970
0
I'm currently got a course work required design a 7 segment display by
using a JK flip-flop to build a numbering countdown minimun with 1
digit.

http://www.tinaja.com/ is a good place to start.


--
_____ _ _
|_ _| | | | |
| | __ _ _ __ ___ | |__| | ___ _ __ ___ ___ _ __
| | / _` | '_ ` _ \ | __ |/ _ \| '_ ` _ \ / _ \ '__|
_| |_ | (_| | | | | | | | | | | (_) | | | | | | __/ |
|_____| \__,_|_| |_| |_| |_| |_|\___/|_| |_| |_|\___|_|
__ ____
/ _| | _ \
___ | |_ | |_) | ___ _ __ __ _
/ _ \| _| | _ < / _ \| '__/ _` |
| (_) | | | |_) | (_) | | | (_| |_
\___/|_| |____/ \___/|_| \__, (_)
__/ |
|___/
 
T

Tim Wescott

Jan 1, 1970
0
Hello,
I'm currently got a course work required design a 7 segment display by
using a JK flip-flop to build a numbering countdown minimun with 1
digit.

I'd like to know is, what is the way or how i do design the circuit,
now i no any idea to design it..
i don't have any idea right now, so please help me please...
(sorry for my parlance or using sentence wrongly.. i also very
hardworking to learn English )

Thanks.
Are you really going to school some place where there are neither
instructors nor teaching assistants who talk to students? That's the
preferred route -- if for no other reason then if 1/4 the class asks the
same question (and the guy's not a dip) he'll realize he's got to go
over the material again.

This is a basic exercise in digital logic, although a 7-segment display
is a bit much. If you truly are tasked with using seven flip-flops, you
want to make a map of the ten allowable states of the display, with the
J and K inputs necessary to each flip-flop to generate the next step in
the count down. With four bits this is easily done by exhaustively
listing all 16 possible states and their follow-ons, then making a
Karnaugh map, but with seven it would be a pain. There's a technique
that basically works like a Karnaugh map in tabular form, but I can't
remember it, and you'd still need 128 entries just to get 10 valid states.

You _could_ look at the seven segments to see if there are just four or
five unique ones, then use those for your Karnaugh map -- this might be
how I would proceed, assuming I couldn't just use a PIC and some software.

If you're just supposed to use J-K flip-flops _somehow_ then I suggest
you make a plain-jane 4-bit down counter, and a bunch of NAND gates to
map the bits to the segments -- I suspect this will require less logic,
but what do I know?

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Posting from Google? See http://cfaj.freeshell.org/google/

"Applied Control Theory for Embedded Systems" came out in April.
See details at http://www.wescottdesign.com/actfes/actfes.html
 
M

martin griffith

Jan 1, 1970
0
On 30 Aug 2006 11:14:48 -0700, in sci.electronics.design
Hello,
I'm currently got a course work required design a 7 segment display by
using a JK flip-flop to build a numbering countdown minimun with 1
digit.

I'd like to know is, what is the way or how i do design the circuit,
now i no any idea to design it..
i don't have any idea right now, so please help me please...
(sorry for my parlance or using sentence wrongly.. i also very
hardworking to learn English )

Thanks.
http://en.wikipedia.org/wiki/JK_flip-flop
look at the timing diagram, or download a datasheet, you will see that
for every two clock pulses going in, only one comes out.

Now what will happen when you feed the output from one FF to another?

If you repeat this you get a binary counter, add a bit of decoding
hardware and drive your display


martin
 
L

Luhan

Jan 1, 1970
0
Hello,
I'm currently got a course work required design a 7 segment display by
using a JK flip-flop to build a numbering countdown minimun with 1
digit.

I'd like to know is, what is the way or how i do design the circuit,
now i no any idea to design it..
i don't have any idea right now, so please help me please...
(sorry for my parlance or using sentence wrongly.. i also very
hardworking to learn English )

Thanks.

The many questions like this that are posted here re-enforces my own
opinion of most institutions of learning.

Luhan
 
P

petrus bitbyter

Jan 1, 1970
0
Hello,
I'm currently got a course work required design a 7 segment display by
using a JK flip-flop to build a numbering countdown minimun with 1
digit.

I'd like to know is, what is the way or how i do design the circuit,
now i no any idea to design it..
i don't have any idea right now, so please help me please...
(sorry for my parlance or using sentence wrongly.. i also very
hardworking to learn English )

Thanks.


Good design starts with good specification. As long it's not clear for
yourself what exactly you have to design you're in the mist. So what does it
have to do and how should it look like?

petrus bitbyter
 
J

James Thompson

Jan 1, 1970
0
Luhan said:
The many questions like this that are posted here re-enforces my own
opinion of most institutions of learning.

Luhan
You are right there! Schools anymore are force feeding info, and don't
really care to take the correct amount of time to let students really learn
the basic foundation of a subject before moving on. And then the students
don't want to appear brain dead and ask the questions, So they turn to
places like here to ask. Students should never be alowed to move on, without
a full understanding of basic circuits.
It's like skipping the foundation of a house and go on building the walls,
It makes a weak structure. JTT
 
M

Minq

Jan 1, 1970
0
Thank all... i will read as a referrence... i think i already got a
little idea... if i got any question i will post here again...

Kuan Ming
 
R

Richard Henry

Jan 1, 1970
0
Hello,
I'm currently got a course work required design a 7 segment display by
using a JK flip-flop to build a numbering countdown minimun with 1
digit.

I'd like to know is, what is the way or how i do design the circuit,
now i no any idea to design it..
i don't have any idea right now, so please help me please...
(sorry for my parlance or using sentence wrongly.. i also very
hardworking to learn English )

Easy rule for JK flipflops: if J and K are different, then at the
clock the Q-/Q output will match the inputs (J to Q, K to /Q). If J
and K are both high, the outputs will toggle. If J and K are both low,
the outputs will not change. All this assumes the R and S inputs are
inactive.
 
F

Frithiof Andreas Jensen

Jan 1, 1970
0
I'd like to know is, what is the way or how i do design the circuit,
now i no any idea to design it..

Whenever I see post like that I marvel at the job-for-life +
huge-salary opportunity that the standard level of education seems to
be creating.

The downside is that the b*stard politicians will find a way to make
me work well beyond 70 years to pay the subsistence of all the
"students"!!
 
V

vasile

Jan 1, 1970
0
Hello,
I'm currently got a course work required design a 7 segment display by
using a JK flip-flop to build a numbering countdown minimun with 1
digit.

You have to do it using *only* JK flipflops or your teacher request
you to build a counter with JK flipflops, a binary to bcd converter and
one 7 seg display ?.
Ask him again...

Vasile
 
Top