LED Decatron

This is an old project, but i have updated the PCB
This design simulates what a decatron looks like, but can be driven from low safe voltages
each module has several connections broken out to make it versatile, mostly as a counter
If you start with a 100Hz clock, you culd display seconds down to 100th of a second
the enable pin can be commoned to start and stop the count,
The carry out pin connects to the clock pin of the next module to continue the count
I have included a secimal point that can be optionally used on a separate pin
R1 and R3 are chosen for brightness of LED's, i have chosen 10K for both, R2 is a 1K pull down resistor
There's also a link, when closed this reset that module at the count of 6, handy for counting 60 seconds, and 60 minutes



Download Gerber file here


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