I think magicians should avoid all technical apparatus, for the above reason.
The best trick I have ever seen: A swedish magician made a series of tv shows, where he approached tourists on beaches in sweden. Language problems with foreign tourists added to the comical effect. His nice personality and charm was a big part of his shows.
He did a few tricks with a red piece of cloth, like palming it and other classical stuff. When that trick was over he throws away the cloth over his shoulder and reaches for the next trick in his pocket, but the red piece of cloth does not fall to the ground, it starts to fly like a butterfly, and he and the people around him look at it with astonishment, as it gains speed and flies towards the forest behind the beach, it flies in among the trees and finally disappears some 200 meters away from the crowd at the beach.
That was just incredible. And the magician looked just as surprised as everybody else. "What the f*ck is that red cloth doing?"
Obviously he must have attached some thin, nearly invisible line to it, and had a motor in the forest, up in a tree, which pulled it in, with changing speeds, so it slowed down, picked up speed, slowed down, picked up speed and gradually the speed increased somewhat. The effect was that it was behaving like it was alive.
I was more impressed, and had more fun watching that trick, than any technical apparatus trick ever could have given.
We have a problem with people who try to get something built, often offering a few bucks for it. Such people think we are a bunch of high school kids who would be thankful for the chance of making a few bucks.
The reality is that most of the experts here are old and rich and very knowledgeble people who enjoy writing explanations, old engineers and writers of technical books. Such people have no need for small sums of money, less than 10000 dollars won't even get them off their chairs. It doesn't mean anything to people who have already made millions working for NASA, are responsible for the circuits inside every PC, are owning their own factories or are old authors of books and electronics magazine articles.
Give them an interesting question and they will write pages of explanations, and design circuits, but they will not build anything and are not interested in money.
He might find an exception, don't let me discourage anybody, I just want to inform the other person that the chances of getting anything built by these old geezers are not so big. But he can take their advices and circuit suggestions and find somebody locally to build it.