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There are two types of 4014 LEDs !

A project log for 4014 LED minimodule

A cheap, small module that displays two 7-segments digits with simple multiplexing

Yann Guidon / YGDES 09/06/2016 at 06:572 Comments

@al1 found that his 4014 LEDs have a reverse protection diode. I found the same and made the v.2 layout.

Today, I started to solder the #DYPLED prototype so I opened a new batch of LED (warm white instead of neutral) and... NO DIODE !

Alex, don't throw your PCB away, I'll solder mine and see what can be done. I'll see if I could send you a few diodeless LEDs :-)

So in the end, there are 2 types of LEDs, hence 2 types of PCB...

Discussions

al1 wrote 09/06/2016 at 15:08 point

okay these 4014 are a kind of nightmare for production. Better do not use them in multiplexing scheme were any diode character of the LED is needed. 

I did changed my PCB order. It should be rev2 now, but I did not recieved them yet. The mail is still somewhere in the USA.

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Yann Guidon / YGDES wrote 09/06/2016 at 15:55 point

OK, in either case, just know that there is more than one way :-)

In the case of #DYPLED, fortunately I used an insensitive multiplexing scheme. But there are many differences between the cold white and warm white LEDs. Fortunately I have 3K of each so I can make small and medium runs :-)

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