I do so love it when Excel is used for electonics purposes. However in your case I see it was only a tool to support your insight.
I hope you don't mind if I subvert the thread and point your readers to my blogs on the use of Excel in electronics on Planet Analog. There are at least 4 more to come over the next 6 months. One is due out any day now.
@Antedeluvian - of course I don't mind! I am also looking forward to more of your articles. I have a very good book called Excel by Example by a guy called Aubrey Kagan (unfortunately now out of print) which has some very good Excel tricks in it. I learned a lot from that! :-)
@Zwede - as I said, for the uninitiated you could use it as a decimal to binary converter for numbers less than 64. Just write "32 16 8 4 2 1" and underneath those numbers, write a 1 if your number is on the corresponding card, and 0 if it is not. Bingo - Binary representation of your number!
@David Ashton...did you at the time figure out how it worked??
No. I was eight or nine years old at the time and did not know binary math. I recall amazing all the relatives and being stubborn about not telling how it was done because magicians were not allowed to reveal their secrets.
I also have used '"PCB Designer by Niche Software" for years in my classroom. I recently had to upgrade to windows 7 running 64 bit. Now my PCD Designer will not run!!!!! (is 32 bit software) Have you come across a fix for this? I really like to use the software for my young students because everything else out there is too complex. Can you contact me Thank you in advance.