The Digital trainer kit we are using has 7 segment display, I wish to use it to realise the output for the 3 bit counter. How exactly can I use it? Where to give inputs?

I'm attaching the picture of what I'm trying to do. What are A,b,c,d in the display?

  • \$\begingroup\$ Have you checked the manual? \$\endgroup\$ Commented May 16 at 9:55
  • \$\begingroup\$ I don't have one, this kit belongs to lab@RohatKılıç \$\endgroup\$ Commented May 16 at 9:58
  • 1
    \$\begingroup\$ It looks like it has converters built-in for converting binary to display patterns so just connect your counter outputs to A, B and C of one of the displays? \$\endgroup\$
    – Finbarr
    Commented May 16 at 10:02
  • \$\begingroup\$ It's not displaying anything @Finbarr, I guess my circuit is wrong \$\endgroup\$ Commented May 16 at 10:21
  • \$\begingroup\$ Maybe you need to get power to it somehow \$\endgroup\$
    – Finbarr
    Commented May 16 at 10:35

1 Answer 1


It appears to be a BCD-input 7-segment display.

You apply logic inputs to ABCD pins. Examples:

A B C D Number
0 0 0 0 0
0 0 0 1 1
0 0 1 0 2
0 1 0 1 5
1 0 0 1 9

Could also be in the reversed order i.e. DCBA instead of ABCD.


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