Hi Roy,

On 07-Jan-04, Roy J. Tellason wrote to all:

 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
 RJT> something.  I don't know if this was a part of an assortment sold
 RJT> as such,  just an assortment of parts,  or if it was meant for
 RJT> some particular circuit.  I suspect the former as it resembles a
 RJT> number of bags of quarter watt resistors I encountered a while
 RJT> back during another session..

 RJT> Anyhow much of what's in there is pretty generic stuff.  Two
 RJT> things stand out though

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

OK. So what _IS_ the part number? I can't look it up if you don't tell
us! And until I can look it up I don't have any ideas :-(.

 RJT> The other part that jumped out at me as being a little unique was
 RJT> a 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 on
 RJT> the matter

Hmmmm.... Who by? I have:

AD565 as a high speed 12 bit D/A convertor by Analogue Devices.

I have data on this one.

NE565 - PLL by signetics.

From the Signetics data book (Hardback dated 1974!):
"The SEW/NE565 Phase-Locked Loop (PLL) is a self contained, adaptable
filter and demodulator for the range 0.001 Hz to 500 kHz. The circuit
comprises a voltage-controlled ocilator, an amplifier and a low-pass
filter..."

Applications:
Frequency shift keying
Modems
Telemetry receivers
Tone decoders
SCA receivers
Wideband FM discriminators
Data synchronisers
Tracking filters
Signal restoration
Frequency multiplication and division.

The application section of the data sheet has as examples:
FM demodulation
Frequency shift keying
Frequency multiplication
SCA (background music) decoder

There is much more stuff in the applications book (also hardback dated
1974!)

George

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