Connect with us

Looking for (really) old construction article

Discussion in 'General Electronics Discussion' started by Benjy Boy, Sep 30, 2014.

Scroll to continue with content
  1. Benjy Boy

    Benjy Boy

    4
    1
    Sep 30, 2014
    I am looking for a computer construction article from my youth. The
    project contained several flip-flops to form a counter. Each
    flip-flop was on a single board and constructed from two TO-3 power
    transistors, one of which drove an incandescent lamp. The counter was
    driven by a rotary phone dial. The circuit added numbers dialed
    on the rotary dial. To subtract, you had to do ten's complement or
    some such. The output was read in binary from the incandescent lights.

    I thought the article was in Popular Electronics from the mid-1950's or
    early 1960's, but some time with a microfiche machine hasn't turned
    up the article. I did find a similar article in the November 1966
    Electronics Illustrated (http://www.dos4ever.com/ring/ELIL.pdf);
    however, this circuit uses neon blubs to form the counter.

    A similar device is shown in a picture at The Obsolete Computer Museum
    site on top of a TRS-80: http://www.radar58.com/Computer/pcs.jpg

    I'm interested in the article for its historical significance since
    it is one of the earliest computer projects I know of. Any help
    locating the article would be appreciated.
     
  2. KMoffett

    KMoffett

    723
    75
    Jan 21, 2009
    Wow. I remember that! Lots of 2N3055s and a rotary telephone dial as an input number/count generator. But, all my Poptronics magazines went long ago.

    Ken
     
  3. shrtrnd

    shrtrnd

    3,827
    520
    Jan 15, 2010
    Maybe Popular Electronics has an archive. Did you contact them to ask?
     
  4. Benjy Boy

    Benjy Boy

    4
    1
    Sep 30, 2014
    I believe that the transistors were indeed 2N3055's. I had forgotten that.

    I've looked on the web for Popular Electronic archives. Also, I looked at the issues I could find on microfiche. From the Wikipedia article on Popular Electronics, it seems the publisher hasn't been in business for awhile.
     
  5. Benjy Boy

    Benjy Boy

    4
    1
    Sep 30, 2014
    Ken, Thanks for the links. That's really great! I had missed that site. It appears they have all the issues missing from the collection I looked at. I'm not sure the article I'm looking for is in PE, but it probably was. So now I can be sure. Benjy
     
  6. Benjy Boy

    Benjy Boy

    4
    1
    Sep 30, 2014
    chopnhack likes this.
  7. KMoffett

    KMoffett

    723
    75
    Jan 21, 2009
    Yeah! OK, I was wrong about Popular Electronics and the 2N3055. But it was a TO-3 case. :)

    Ken
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-