Geez,
I remember laying out thick film hybrids in rubylith...
This is 'dating' Inge!
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
Sent: Sunday, October 06, 2013 5:10 PM
To: [log in to unmask]
Subject: Re: [TN] NTC for today
I made my first circuit by hand. Used scalpel and X-film, half sq meter and
crimped it in the photolab to 1x2 inches. It was a trigger circuit for laser
guided missiles. We produced over 50,000 of them. That was before we bought
the X-Acto table. We used both hands and heads. Now quarter of head and
index finger....
On 5 October 2013 23:39, Robert Kondner <[log in to unmask]> wrote:
> "Computers were simple then"
>
> Did computers really get more complex or just more transistors? :-)
>
> I kind of like the comparison of chemical cameras (film or glass
> plate with silver compounds) to digital cameras when compare
> complexity. I mean the effect of electronics on photography has indeed
> been a revolution. But actually, if you think of tiny grains for
> silver in emulsion as electrochemical pixels you do see that old film
> was not that "Super Simple", it was just easier to manufacture with
> simple tools.
>
> I also marvel at that Apollo computer, and the fact the tools back
> then for designing PCBs were rubylith and X-Acto knives. Like the
> pyramids there are simply ideas that take tremendous engineering efforts
to make happen.
>
> Bob K.
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
> Sent: Saturday, October 05, 2013 5:13 PM
> To: [log in to unmask]
> Subject: Re: [TN] NTC for today
>
> I'm afraid it's not a space plane but just a plan.
> Actually, there is something I always wonder about. Go back to Neil
> Amstrong and that time...Apollo, for instance. The computers at that
> time were simple, compared to today's machines. I know, because I
> passed a glass box every day before I entered the clean rooms. In that
> box was Apollo's main computer, which we built. Lot's of transistors,
> most TO-18 and TO-5.
> Specked with 2N1893, 2121, 2902, which were very popular. Back to the
> path.....as I said, very simple stuff. The main functions were 'small
> push/pull rockets and main rockets, as long as the service module and
> the astronaut capsule were together. And communication radios. And
> sensors of various nature...but in alles rather uncomplicated
> electronics. My
> question: The central station in Houston was a large room with lots
> and lots of work stations. A hundred persons "worked" there, all with
> their noses close to the many large computer displays.Why was it
> necessary with such many work stations?
>
> Inge
>
>
> On 5 October 2013 20:13, Steven Creswick <[log in to unmask]>
> wrote:
>
> > Hey,
> >
> >
> >
> > I read somewhere that Sweden is making a spaceplane. How about a
> > ride on that, and play the Blue Danube?!!!
> >
> >
> >
> > Have a good time cruising!
> >
> >
> >
> > steve
> >
> >
> >
> > From: Inge Hernefjord [mailto:[log in to unmask]]
> > Sent: Saturday, October 05, 2013 1:17 PM
> > To: TechNet E-Mail Forum; Steven Creswick
> > Subject: Re: [TN] NTC for today
> >
> >
> >
> > Thank you, buddy,
> > take care ya'self.
> >
> > Inge
> >
> >
> >
> > On 5 October 2013 02:43, Steven Creswick <[log in to unmask]>
> > wrote:
> >
> > It's probably already tomorrow there, but happy belated birthday Inge!
> >
> > Steve
> >
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Ed Popielarski
> > Sent: Friday, October 04, 2013 3:32 PM
> > To: [log in to unmask]
> > Subject: [TN] NTC for today
> >
> > It's Ingemar Hernefjord's birthday today!
> >
> > Happy Birthday, Inge!
> >
> > Ed Popielarski
> > Engineering Manager
> >
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