binary counter

[ngogketrao]

hello!
 
   i don't understand why the count in this 4-bit binary counter jumps 7 (0111) ,in fact i think it cannot display 3 digits at the same time.i checked everything but it seems fine. what did i do wrong or didn't do?

[Lodin]

Hello ngogketrao,

the counter is working fine.

But what voltage across R1 do you expect, if more than 1 LED is on ?

[ngogketrao]

hi

  can you tell me what's wrong with my circuit? it is supposed to be a 8-bit PISO sift register.but the problem is that the diode doesn't display nothing.i have tried many different values for the resistors but none will do.
 
  thank you

[digitalguy]

Tie the inhibit input low.

[ngogketrao]

i have tried that but it doesn't seem to work

[digitalguy]

I took your circuit and simply tied the inhibit input low and it works perfectly. I have v10.0.1 of Multisim. Forgive me if you know this, but you must clock the circuit while the shift/load input is low and the S/R changes state on a low to high transition of the clock. Good luck!