Hello guys,


i've got Course comissiion on my "Scheme Technics" article.
I was hardly ill and missed counsultation lectures. : (

If anyone can help , would be great ...

articles or alike schemes

Thanks,

Dimitri

 

Hello,

Here is a list of pages with links on digital subjects from the EDUCYPEDIA:
Arithmetic circuits
CMOS technology
Codes & decoders
Converters
Counters & registers
DAC/ADC types
Digital logic
Digital theory
Flip flops
FPGA Design
Memory
Number systems
Sigma Delta Conversion
Technology
Timers & oscillators
TTL technology

Bertus

 

Do you know how to build a counter out of Flip Flops?
Do you know how to use the Clear and Preset pins of the FFs?

If the counter has reached the maximum desired number, a logic gate circuit can detect that event and reset the FF counter.

 

bertus
thank you

Georacer

i have to make a scheme
it's theoretical course

I know basics ...

I can build simple 4 bit counter , that uses jk trigers

Also, i've got article "TTL type counter mod 10"..
But i can't do anew it as mod 12

i've been searching on internet and here, but i havent found anything..
I've tried to do it myself, but fail..

 

Post an image of your modulo 10 counter so we can talk over it.

If you examine it, you will see some logical gates placed in a way that they produce a '0' everytime 10 is reached on the count. That zero should be fed on the reset pin.

Of course this is what usually happens. Post your picture and we 'll talk more.

 

Thanks for attention!

image
http://img824.imageshack.us/img824/2971/scheme.png

 

I'm afraid I don't understand what your circuit does. How is the AND circuit supposed to see the number 10? How is it supposed to reset the counter if it sets only the two middle FFs?

Check this site for a proper modulo 5 counter:
http://www.ustudy.in/node/7538

Notice that the designer has a AND gate that detects a 'HIGH' on the bits 0 and 2, which is basically when 5 comes up. Then he resets with the AND gate all of the FFs of the counter.

If you understood what he did, care to make another effort?

 

hello!! first we know that we require 12 modulo counter so so we require four bits and four flip-flops. Now check the attachment that i am providing....

 

@vinay arora

Usually we denote a "don't care term" with an 'X'. It's nice to have only one standard around.

 

Thanks guys for help : )

i guess i've found what i need ..

http://img808.imageshack.us/img808/93/picture1ge.jpg

what do you think?

 

You got it! In the offchance it resets to 1 and not to 0, reset all of the 4 FFs, not just the 2 MSBs.

 

Georacer

removed first 2 triggers from "high" .
Now all triggers "reset" are connected to CLR



thank you so much : )
i realy appreciate your help !

 

You 're quite welcome. I hope you reach a level where you can help others too.

 

@vinay arora

Usually we denote a "don't care term" with an 'X'. It's nice to have only one standard around.

ok i will take care of that....next time....