Hi MIKE,

On 08-Jan-04, MIKE ROSS wrote to Roy J. Tellason:

 RJT>> Anyhow much of what's in there is pretty generic stuff.  Two
 RJT>> things stand out though. One is a chip resembling an op amp,
 RJT>> but apparently preconfigured as a unity-gain buffer.  I found it
 RJT>> easily enough in my databooks, though I don't know why you'd get
 RJT>> these and not just use a standard op amp and configure it as a
 RJT>> unity gain part.  Maybe some difference in the spec that's not
 RJT>> apparent to me,  or something...    (Anybody know?)   I suppose
 RJT>> I'll think of something to do with these sooner or later. The
 RJT>> other part that jumped out at me as being a little unique was a
 RJT>> 565 PLL chip.  I have heard of this one before,  but have *no*
 RJT>> idea what you'd do with it.  Any of you guys have any thoughts
 RJT>> on the matter?

 MR> I think that PLL was part of a series of chips (IIRC 564, 565,
 MR> 566) which were intended for various frequency ranges and uses. I
 MR> think the 566 & its cousins was common in project magazine FM
 MR> radio SCA projects to decode 76KHz (?) subcarrier transmissions.

According to my data book it was a 67 kHz subcarrier. So, right
figures, wrong order... :-). It is one of the applications shown for
the chip :-). They say frequency response is to 7 kHz, which is
probably better than the shop background musac (it wasn't _music_!)
system it was intended to feed.

George

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