Lightbulb police? (was RE: Anyone off to VCF-UK)
ard at p850ug1.demon.co.uk
Tue Jun 8 13:31:25 CDT 2010
> Although in a few cases the article makes it fairly easy to figure out
> what the project needs to do. The 1974 thru ~1986 era is
There were microprocessor (and even microcontroller) projects hack then.
At least computers based round the SCMP, 6502 (Junior Computer), 2650 (TV
> all-transistor-and-TTL (with few exceptions), whereas the 1990-1999 era
> is mostly microcontroller systems with little TTL.
> Very odd for them to publish the 1990-1999 PDFs in preference to (say)
> 1974-1984 -- nearly all the transistors used in those circuits were
> "TUN" or "TUP"s; that is, Transistor, Universal, NPN or PNP
> respectively. Diodes similarly were "DUG" or "DUS" -- Diode, Universal,
> Germanium or Silicon. TTL is similarly easily available, any electronics
> hobbyist worth his salt will know that 74LS can usually be subbed in for
> straight-74xx TTL.
Indeed. And somehow I find projects using a handful of simple components
to be more appealing than just a single 40 pin microcontroller.
> > I stopped reading AP when the editor changed some years ago. Roger Hicks
> > no longer wrote an article every week, it almost totally dropped film
> > photography, and the answers to readers questions were misleading to say
> > the least (I seem to remember them perpetrating ythe myth that the focal
> > lenght of the lens affrcts perspective). Oh, and the 'classic camera'
> > articles became only 2 pages long., although even before that they were
> > somewhat lacking in accuracy.
> It's both amusing and saddening to see them publish an answer to
> someone's query one week, then publish a retraction-and-correction the
I rememebr them saying it was better to store recharageble batteries in
the discharged state (since they then couldn't self-discharge). There my
be a battery technology where that's true, but most of the common ones
are better stored charged.
> following week. Things like suggesting RAID arrays as an alternative to
> offline backups (CD-R, DVD-R, tape, ...)
> Little hint -- what happens if there's a power spike?
Second little hint : None of my cameras has a hard disk, or a CD-ROM
> > What I do read is :
> > Model Engineer, and Model Engineer's Workshop (the latter is more
> > interesting to me, being more on workshop techniques, the former being
> > mostly about making steam engines, but you do get useful information from
> > it, which is why I read it).
> I'd really like to learn how to do some more advanced
> plastic/metalworking (and get the tools to do it).
It is great fun. The problem is the startup cost. A good lathe is not
cheap, but then again it will last all your life if you look after it.
> At high school we had a fair few wood/metalworking tools (most of which
> were in pretty good nick), a teacher who knew his stuff (IIRC he used to
> work for a metalworking company, retired, then started working as a
> teacher). We also had a headteacher who was the sort of person who'd
> make the kids run around in plastic bubbles for "health and safety"
> reasons. Design-tech and science got cut almost entirely (the latter had
> all the experiments and demonstrations cut and was turned into a lecture
> / question-and-answer / exam session)...
Do the world a favour, and put that headmaster between centres :-). A
light skimming cut should do the job...
Fortunately I managed to get away with all sorts of lethal things at
school. As I mentioned once before, when the rest of the kids were
booting spheres around areas of grass, I was making a CRT in a bell jar.
Or fooling around with valves. Or...
I learnt nothing at school that I was _supposed_ to be learning, though.
Certianly not from the so-called teachers.
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