A bit of explanation of what I do, as I keep getting asked: I photograph wildlife and anything interesting, and have been interested in electronics for a long time, but never mastered it as you can see. I wanted to adjust Cameras at a distance and at first used radio control and Binoculars, then Wifi, with my sons help. Then I tried relaying the signal to get the long range. The WIREs seemed best, so here we are. I am also interested in Generators and I have designed a linear Engine with a Motor engineer. While he gets on with the engine side, my side is to design the electical side, this is where the coil experiments help my understanding. This technology lends itself to many ideas, and WIRE following has been suggested and sounds interesting, so these circuits might come in handy for that too. So now you know more than I do about what I'm up to, I hope it helps.