That sounds good with the pcb.
The NE555 needs between 4,5v and 18v.
It's a good idea to use a TLC555.
I will try this.
I want to build a convertor, too.
http://www.bit-racing-world.de/threa...=8247#post8247
Here is the video as a gif.
There you can see the problem with the 4 middle LEDS.
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