Hello, I've been trying to experiment with this magnetic drawing board (EtchaSchetch) and my electromagnet is virtually useless, for making screen marks. I'm playing around with having a 'magnetic non-volitile display'.
Problem seems to be apparent strength of the field. Meanwhile, the little permanent magnet (writing stylus) makes marks from as far away as 1 mm, from the pad screen.
Only when I tried putting 9 volts across the coil, briefly, did the electromagnet cause a barely visible spot to appear. (Meanwhile causing auditable glitches in nearby radio receiver).
I had planned to experiment with the magnetic display, that seems capable of approx 30 by 40 dots across the screen.
Does this mean that in any motor, etc, the electromagnetic part is very weak, compared with permanent magnets used?