A few days ago, Max (the Magnificent) and I were talking about the electronic projects we are currently working on and comparing them to the ones we did when we were kids.
I happened to mention one project that I created when I was 10 years old. This project made my dad so proud that he showed it to all his friends. When Max heard about it, he asked me to write it up to share it with other members of the EETimes community, so here we go...
This all happened back in 1965. Perhaps the best way to start is to describe what my project did and how it appeared to outside observers. First, there was a small cardboard box with holes in it that looked like a microphone. This was mounted on the wall next to the closed door of my bedroom. When I walked up to this box and said "open" into it, the door quickly opened and I stepped into the room. I then turned around and faced the people outside the room as the door closed slowly behind me.
Now, given that this was 49 years ago when there were no microcontrollers and such, and given the simple and inexpensive components that were available to the average 10 year old at that time, can you figure out how this was achieved? When you've pondered this for a while, continue to the next page for a detailed explanation.
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