Mod-10 decade counter

ASHOK
ASHOK P R
• Created on Feb 3, 2021 • 0 • 0 • 2
Edit Circuit Copy Circuit Try Yourself
Mod-10 decade counter
100%

Integrated Circuits Used

74LS90 74LS08

Description

NOTE:- If we wish to design mod-n counter, the only thing we need to make sure is that pin numbers 2 and 3 should get input 1 as soon as count reaches n. This will reset counter to 0 after seven segment display displays n-1. We can use and gate for this purpose. For example, for a mod-6 counter, reset pins must receive inputs equal to 1 as soon as Q3Q2Q1Q0 becomes 0110(binary equivalent of 6). So give Q2 and Q1 as inputs to and gate and connect the corresponding o/p to reset pins of decade counter. Similar approach can be used for other mods.

Procedure

  1. Add IC 74LS90 into ICBase-1 (74LS90).
  2. Add IC 74LS08 into ICBase-2 (74LS08).
  3. Connect VCC Port to Pin-5 (VCC) of ICBase-1 (74LS90).
  4. Connect GND Port to Pin-16 (Ground) of ICBase-1 (74LS90).
  5. Connect GND Port to Pin-6 (Input) of ICBase-1 (74LS90).
  6. Connect Pin-7 (Input) of ICBase-1 (74LS90) to GND Port.
  7. Connect Manual clock Port to Pin-20 (Input) of ICBase-1 (74LS90).
  8. Connect Seven segment display 2 to Pin-18 (Output) of ICBase-1 (74LS90).
  9. Connect Pin-15 (Output) of ICBase-1 (74LS90) to Seven segment display 2.
  10. Connect Seven segment display 2 to Pin-14 (Output) of ICBase-1 (74LS90).
  11. Connect Pin-17 (Output) of ICBase-1 (74LS90) to Seven segment display 2.
  12. Connect Pin-1 (Input) of ICBase-1 (74LS90) to Pin-18 (Output) of ICBase-1 (74LS90).
  13. Connect GND Port to Pin-7 (Ground) of ICBase-2 (74LS08).
  14. Connect VCC Port to Pin-20 (VCC) of ICBase-2 (74LS08).
  15. Connect Pin-1 (Input) of ICBase-2 (74LS08) to Pin-17 (Output) of ICBase-1 (74LS90).
  16. Connect Pin-2 (Input) of ICBase-2 (74LS08) to Pin-14 (Output) of ICBase-1 (74LS90).
  17. Connect Pin-2 (Input) of ICBase-1 (74LS90) to Pin-3 (Output) of ICBase-2 (74LS08).
  18. Connect Pin-3 (Output) of ICBase-2 (74LS08) to Pin-3 (Input) of ICBase-1 (74LS90).
  19. Connect VCC Port to ICBase-2 (74LS08).