Breadboards and perfboards make is easy to build all kinds of electronics, but they're not exactly easy to understand at a glance. Thankfully, Adafruit has a video that walks you through the basics.
Back in the late 1960's, I experimented with DTL. That's not a misprint. DTL stands for diode-transistor logic and it was popular in “930-series” logic devices. I used wire-wrap or point-to-point ...
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