I'm designing a PCB [double-sided protoboard] using a 4017 with all its outputs used to illuminate LEDs in counting order. Does anyone have a trace/wiring layout already figured out for this? I want minimal space, short traces/wires and so on. I want the LEDs all in one column, probably parallel to the 4017 but I have some flexibility to make it perpendicular if that saves space.

I can obviously get to this myself eventually but this chore has to have been done by others a zillion times already.

 

Oh.. thats cheating..

 

Haha, isn't that what we do here?

 

Here you go:

http://www.aliexpress.com/store/pro...-Water-Lamp-Module-Red/617213_1147432389.html

 

Awesome. I'll look that over. Why do they use a resistor on each LED instead of a single resistor on the ground line for the LEDs? Only one at a time will be lit.

 

All Electronics, CAT# AEC, LED Chaser KIT , $ 6.50; 555 & 4017, PCB, & allparts.
This one uses one LED I limiting R.

 

Those are good suggestions but neither layout uses the 0.1" perfboard layout, so I brute forced my own layout. I'm not super happy with it - too many wires - but it's not obvious to me how I could improve on it.

 

Here you go:

http://www.aliexpress.com/store/pro...-Water-Lamp-Module-Red/617213_1147432389.html

That is too too too expensive ...

 

I made no cost judgement (except to raise an eyebrow at all those resistors). It's just that the PCB trace layout doesn't apply directly to my perfboard, so I chose to do my own layout.

 

In the commercial board, they used resistors for both limiting current in the LEDs, and as jumpers across traces. Yes, you really only need a single resistor, since only one LED can be on at a time - but you'll still need jumpers due to the IC's pinout and your board layout requirements. Resistors are really, really cheap when bought in quantity - and make for good jumpers when required.