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Article from 1970's electronics magazine

Discussion in 'Hobby Electronics' started by Harry Pfeifer, Oct 17, 2006.

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  1. I am trying to locate a construction project called "LED's and Ladders which
    was published in one of the well known Australian electronics magazines in
    the 1970's, or late 1960's probably in Electronics Today (ET), later known
    as Electronics Today International (ETI), but there is a possibility that it
    may have been in Radio Television and Hobbies (RTV&H), which was later
    renamed Electronics Australia

    The concept of the project is the same as another puzzle called Stairway to
    Heaven. It consists of a column of LED's, none of which are illuminated at
    the start, but by pressing a push button switch at the appropriate time,
    additional LED's can be illuminated. If the button is pressed at the wrong
    time, some of the LED's which are illuminated will be extinguished. The
    object of the puzzle is to get all of the LED's illuminated

    Between 1974 and 1979 I taught electronics in a Victorian secondary school,
    and some of my students made one of them in class, indicating that it was
    published before 1979. I am interested in making one of these but using my
    own design based on a PIC microcontroller, and my interest in the magazine
    is solely for the excellent artwork for the front panel.

    I am not interested in the later version with different electronics, and
    inferior front panel artwork, published in RTV&H/ Electronics Australia in
    August 1980. This date is outside the relevant time scale hence it cannot
    be the one of interest.

    I would be grateful if someone could provide information as to which
    magazine and which issue it was published in,
    or if they have the magazine could they please scan and email me a copy of
    the front panel artwork to
  2. Ray

    Ray Guest

    LED's and ladders was an Electronics Australia project, and at a guess
    it was around 1979 as I also remember building it during my high school
  3. Ray

    Ray Guest


    try emailing Silicon Chip, they took on the role of EA back issues when
    they went under, plus Leo worked there way back then.
  4. Phil Allison

    Phil Allison Guest

    "Harry Pfeifer"

    ** Electronics Australia - March 1976.

    Source = RCS Radio master PCB list.

    Board number = 76G3

    ........ Phil
  5. EA March 76 according to the EA project archive:

    Silicon Chip can provide a copy.

    Dave :)
  6. Lionel

    Lionel Guest

    Wow, that brings back memories! I built one of those as a kid.
    It was definitely an Electronics Australia project, & would've been
    published somewhere within cooee of 1977.
    That was the project on which I learned to solder PCBs. :)

    It was pretty nice. IIRC, it was a line drawing of the inside of a
    well (lined with bricks), with a zigzag line of 16 LEDs going up a
    drawing of a ladder, with the final LED above the opening of the well.
    It was sized to fit the lid of a medium size Zippy Box (anyone else
    remember that era, when just about ever magazine project was designed
    for Zippy Boxes?)
    As I said above, it was definitely EA, & I believe it was published
    some time in 1977, although it may have been as much as a year or two
    earlier. My copy of the article is long gone, but I got a copy of it
    (& a half dozen other old projects) in the mid-eighties or so, by
    going to the State Library (Vic) & photocopying it from the original
    EA mag's in their archives. I have no idea if they still keep
    periodicals these days, but it'd only take a phone call to find out.

    WRT to emulating the circuit in software, you'd need to be careful to
    emulate the internals accurately, because the sliding difficulty
    factor was what made it fun. The LEDs directly represented the voltage
    on a cap that was fed (via a resistor & the front panel push-button)
    from the output of a (IIRC) 555 timer, so the higher the voltage on
    the cap, the hard it was to increase it, & the quicker it'd drop if
    you timed your button-press badly.

    Please let us know how you go at tracking down the original article,
    because I'm still quite sentimental about that particular project, &
    I'd love to design a new version of it myself. If you don't have any
    luck, I might be able to figure out some way of tracking down a copy.
  7. Lionel

    Lionel Guest

    Yowza! That'll teach me not to write a long reply to someone before
    reading everyone else's replies first. :)

    (Mind you, I bet it it'd still be quicker & cheaper to photocopy the
    original mag at the State Library than to mail order it from SC. ;)
  8. Sure, if you happen to go near the State Library. If not then the
    petrol/parking or train fair is going to cost you more.

    Now, if only SC would make the EA CD like they did for RTV&H. Bet they
    would make a lot more money on the CD than they ever will selling

    Dave :)
  9. David

    David Guest

    I do not have a copy of the article, but I think I still have the project I
    built from the article somewhere in my shed - for sale cheap if I can find it

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