> Hi,
>    I don't know if anyone else has noticed this, but there's a full design for 
> an RFID reader in the current issue of Elektor (September 2005). Only problem 
> is, it needs a 13.56MHz fundamental-mode crystal - as far as I can tell, 
> 13.56MHz is not a standard frequency. Does anyone know where I might be able 
> to get one of these crystals, or a 27.12MHz fundamental-mode crystal? TTL 
> oscillators would also be fine...
> 
>    Failing that, can anyone suggest a way to generate a stable 13.56MHz square 
> wave? Bonus points for cheapness and "junkbox buildability" (i.e. if it can be 
> built out of stuff commonly found in a hobbyist's junk box)...
> 
>    The design in question is the "Experimental RFID Reader" by Martin Ossmann, 
> Elektor September 2006, p.34-38.
> 
> Thanks.
> -- 
> Phil.                    

Hmmm.... I might be missing something here, but I just put "13.56MHz crystal" into google and got > 50k hits. So I suspect it's a standard value somewhere. I did a quick search on digikey's site and found more than a dozen, many in stock and available in singles for less than $2. (though they are all surface mount :-(

So... Am I'm missing something?

-Denny


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