My first discrete 5-stages Johnson counter

A project log for Yet Another (Discrete) Clock

I HAD to finally do this basic "exercice de style" in digital electronics, using some hundreds of transistors and diodes...

Yann Guidon / YGDESYann Guidon / YGDES 05/15/2016 at 05:270 Comments

More progress! Five 10TFF modules are now wired as a "twisted shift register":

Now I just have to re-wire the LEDs to make only one of them shine at a time.

Well, the decoding is pretty simple... Except for one little detail of course.

Back in Another display option I proposed the following diagram:

But it doesn't work right. The actual wiring should be :

It's pretty subtle but it works. The reset state turns LED#0 on.