I'm tryign to make a counter (and by extension all the other things) using a series of flip-flop circuits, and a seven segment display.

As I have it the digit increments through 0xF, which isn't what I want.

I imagine that I need to capture when 1010 happens, and at that point, I need to throw this digit back to 0, and also step up a 10s digit display using the same circuit.

What logic will reset everything to 0 when the And triggers?

Idea using FlipFlop circuitry

  • \$\begingroup\$ What software is this, what are the unlabeled yellow boxes, and what's the block in the top left? \$\endgroup\$ – Jashaszun Aug 8 '17 at 22:29
  • \$\begingroup\$ The software is a flash web site at neuroproductions.be/logic-lab The unlabeled yellow boxes are just junctions where the signal splits. The top left box is a switch that acts as an initial power source. \$\endgroup\$ – Anthony Harlan Aug 8 '17 at 22:31
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    \$\begingroup\$ Anthony, what you are trying to make is often referred to as a "decimal counter" or a "divide by 10 circuit". Look up a 74HCT90, 74LS90, or 74HCT390 IC for some ideas on how this is done with divide-by-2 building blocks (i.e. flip-flops). \$\endgroup\$ – FiddyOhm Aug 8 '17 at 23:39

You probably want to look into the JK flip-flop.

enter image description here

It gives you a clock input so that everything changes simultaneously, but also a means to reset the outputs to zero.


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