PLL's (Re: [sdiy] more pitch shifter thoughts)

[Scott Gravenhorst]

"anthony" <aankrom at bluemarble.net> wrote:

>I've been wondering what could be accomplished with other PLL's too like the 
>564 and the 565 and even some newer ones like the MC88916, TBB200, UMA1015 
>(a PLL and then some...), oh yeah and the XR2212 and XR2215. Of course I 
>only wonder this because I happen to have at least one of each (a bunch of 
>TBB200's though...) - oh except for the XR chips. They look neat though. I 
>suppose I might be on my own in this regard unless someone else has already 
>messed around with some or these. But hopefully someone has a big pile of 
>junk like I do and is after the same thing.
>
>Still 4046's aren't expensive so buying a few is a trivial matter. I guess 
>what I'm wondering is could better PLL research be done with a different, 
>but common and cheap, PLL? I've seen stuff done with a 565, but unless I'm 
>mistaken they cost around $5, which is expensiveish for me (except for
>things like BBD's.)

Don't forget the 74HC4046, it has 3 phase comparators.  One musically
interesting thing might be the use of a phase comparator (like number 1) that
will happily lock onto harmonics instead of the fundamental if that happens to
be convenient for it.  You can also do things like replacing the VCO with
another external type, in this case, something like a 74HC4046 or CD4046
contributes a phase comparator.  Or if you're going to use phase comparator 1
anyway, all you really need is an XOR gate and build the PLL more or less
discretely (not necessarily only using 3 legged parts).



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