This is a Self generating torch made of transformer bobbin, LED, Diode(1N5819 * 4), Electrolytic capacitor (6.3V 3300μF), Neodymium Magnets. A sample of electromagnetic induction experiment idea.
There’s quite a wide range of these ultrasonic water fog generating devices available on eBay. Unlike the traditional ones that have a large piezo disk submerged under water, these ones …
This is just for Fun. This is not useful. Materials : Transformer bobbin, HDD spindle motor, Acrylic plate, Neodymium magnets, Thread, LED, Electrolytic capacitors, Diodes(Rectifier circuit)