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Fans are inductive, so you'd need to add a flyback diode across the load to the power rail or something like that otherwise you'll overvolt the semiconductor from the kickback during switching transients.
Looks good! I was thinking about using this circuit but uprating it to make an immersion heater controller for use with solar panels. I figure that together with a house import/export sensor, dimming a standard immersion heater down to 500 watts through a smoothing inductor should be about right for that application. I'll try to do an instructable if I get it to work.
Given the mica is repelled by oil, I'm wondering if it might be possible to make rheoscopic wave or other toys. They're usually made with coloured water and an oil on top, often baby oil, but adding mica to the water might be pretty cool.Obviously you wouldn't want the mica to migrate into the oil, but if it's repelled by the oil it probably wouldn't anyway. (It probably will a bit, but it will tend to settle back out into the water.)
Multi Magnetic Levitation
I used a rechargeable NiMh battery. I measured it at 8.4v.Maybe snails are less sensitive.
I stripped off the insulation, it was mains electrical wire. Didn't notice any slugs but there were snails that had got past.
I tried this with copper wire and a 9v battery, but it doesn't seem to be working for some reason; the snails just go straight past it. Does it have to be galvanised?
Whiskey Charred Wood
Low-Power Wireless Charging
Delta Bot: DIY 3D Printer
Joule Thief LED circuits
Joule Thief - use LEDs with only one AA battery!
Arduino Sous-Vide Cooker