Hi Roy,

On 10-Jan-04, Roy J. Tellason wrote to George White:

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

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

 RJT> Let me look...

 RJT> They were LM310.

Right. Nationl Semiconductor chips, for which I happen to have a data
book (useful this _real_ book library at times like this ).

LM110/210/310 Voltage follower.

The LM110 series are monolithic operational amplifiers internally
connected as unity-gain non-inverting amplifiers. They use super-gain
transistors in the input stage to get low bias current without
asacrificing speed. Directly interchangeable with 101, 741 and 709 in
voltage follower applications, these devices have internal frequency
compensation and provision for offset balancing.
The LM101 series are useful in fast sample and hold circuits, active
filters, or as general purpose buffers. Further, the frequency
response is sufficiently better than standard IC amplifiers that the
followers can be included in the feedback loop without introducing
instability.

Input current           10 nA
Small signal bandwidth  20 MHz
Slew rate               30 V/uS
Supply voltage range    +-5 to +-18V

 RJT>> The other part that jumped out at me as being a little unique
 RJT>> was a 565 PLL chip.  I have heard of this one before,  but have
 RJT>> *no* idea what you'd do with it.  Any of you guys have any
 RJT>> thoughts on the matter

 GW>> Hmmmm.... Who by? I have:

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

 GW>> I have data on this one.

 GW>> NE565 - PLL by signetics.

 RJT> That would be it.

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

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

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

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

 RJT> No doubt those references wouldn't contain any URLs to where I
 RJT> could find some of this stuff. I'll have to poke around some,
 RJT> see what I can find. Offhand,  though,  I cna't see where I'd
 RJT> want to build anything in any of those categories at this point
 RJT> in time..

Back in those days, as you ought to remember , none of the
companies had a BBS, and commercial Internet was still an outlandish
vision for the future. However, any contact data that's 30 years old
isn't worth following up. Especially given the changes of ownership of
semiconductor companies over the years...

However I'm sure if we really wanted to I could scan the stuff in and
get it to you...

George

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