Greg Mayman wrote in a message to Roy J. Tellason:

 -=> Roy J. Tellason said to All
 -=> about "BAG OF CHIPS" on 01-07-04  20:16.....

 RJT> While sorting out some "stuff" I came across this bag of chips...

 RJT> It was still stapled shut,  so it was apparently meant for something. 

 GM> Yes, I occasionally come across little packets of stuff I've
 GM> obviously set aside for some project and forgotten...

This wasn't my doing,  though.  Reminds me somewhat of assortments of stuff
I've seen at some hamfests.  It was similar to the bags of resistors I had
enountered a while back,  too.  And it's close to being a fairly generic
assortment of parts,  too,  except for that 565 chip.  And those zener
diodes.  Why 5.1v when there's no logic anywhere around?

 RJT> One is a chip resembling an op amp,  but apparently preconfigured as a
 RJT> unity-gain buffer.  I found it easily enough in my databooks, though I
 RJT> don't know why you'd get these and not just use a standard op amp and
 RJT> configure it as a unity gain part.  Maybe some difference in the spec
 RJT> that's not apparent to me,  or something...    (Anybody know?)   I
 RJT> suppose I'll think of something to do with these sooner or later.

 GM> I remember them. The only reason I can think of for their 
 GM> existence was that their compensation circuitrs were all optimized 
 GM> for unity gain.

 GM> Compensation was a big problem and a massive compromise with the
 GM> early op-amps.

Yeah.  I still have a "709" or two around,  and maybe an 811
(which I'm sure nobody has ever heard of),  stuff like that.  They were
actually considered superior to the 741 for some uses,  though I can't
recall which uses those were offhand.

 GM> I remember the hoohah that heralded the 741, the very first op-amp 
 GM> with internal compenstaion that would work right down to unity 
 GM> gain!

Heh.  I had a lot of trouble back then because of not having the proper
information to use a lot of those chips.  I'm still not sure where I'd look
for it offhand if I needed it,  though I do have that op amp cookbook
around here someplace.

 RJT> The 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* idea
 RJT> what you'd do with it.  Any of you guys have any thoughts on the
 RJT> matter?

 GM> From my very battered old NS databook...

 GM> "The LM 565 and LM565C are general purpose phase locked loops 
 GM> consisting of a stable, highly linear voltage controled
 GM> oscillator for low distortion FM demodulation, and a double 
 GM> balanced phase detector with good carrier suppression. The VCO 
 GM> frequency is set with an external resistor and capacitor, and a 
 GM> tuning range of 10:1 can be obtained with the same capacitor. 

 GM> It operates from power supply range of +/-5 to +/-12v, max frequ
 GM> typically 500KHz.

500KHz?  Hm.  Not that much,  really,  though with all the tricks that get
wrapped around PLL circuits that doesn't mean that it's not useful.

What would you do with one of these?  :-)

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