>      It's very weird. I'm scratching my head, looking at my scope, 
> modifying my source code... no conclusions. The LEDs on the first and 
> second '595 are ok, on the third it's happening, on the fourth it's 
> worse, on the fifth it's even worse, on the sixt it's like sh*t.
> 
>      Someone can give any clues? Please, if you need more 
> informations 
> just ask.

Clock skew? If the N-1 chip has changed its D-out before the clock edge
arrives at the N chip you will have problems. IMHO the only real
solution is to use a chip with a delayed output. (IIRC HC4094?)

To diagnose: try feeding the clock from the opposite end of the chain.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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