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Tag: Technology

When I was a kid, I had a great fascination with electronics – as in how circuits work, not buying consumer electronics. One thing that would have really helped back then would have been a computer program to simulate circuits.

These applications did exist. I can remember seeing an ad for one of them, but they tended to be ludicrously expensive.

Today, I found Logisim, which does exactly what I would have loved to have had 15 years ago, and released as Open Source.

What Logisim does, is allow you to draw logic circuit diagrams with built-in components, including logical gates, timers and other components, and then also run tests on the circuit to see the results.

This app is useful for people ranging from the learning logician to the next computer designer.


Bells Labs has been involved in telecommunications since the dawn of the telephone, and along the way many interesting technologies have come out from behind their doors.

Now, it is possible to download the entire catalogue of the a href=””>Bell System Technical Journal in PDF format.

The journal ran from 1922 until 1983, which means the majority of the information contained in the journal is hopelessly outdated, but it still can prove very interesting reading, especially if you are interested in historical technology.