To download mp3 (audio): Click "Download mp3" button
To Cut/Crop mp3: Please use the slider below and click on "Download mp3" button to download the selected part.
Note that video to mp3 conversion output is limited to 10 minutes.
Magnetic sphere is N38, diameter 1" (26 mm).
Coil is a basic vortex coil, 120 notches; stepping 41, aready energized with 180° phase-shifted square wave signals @ ca. 13 Hz at start of video. Powered by a 12 V car battery, with a 21 W car light bulb as load in each circuit.
Signal generation by sqare wave generator, 50% duty cycle.
I use a DDS20 digital square wave generator which I bought from www.elv.de www.elv.de/output/controller.aspx
Signal B is produced by a NOR-gate, so that it should be exactly in phase opposition to signal A, that is to say while A is ON, B is OFF and vice versa. With my signal generator I can only change the frequency. No alteration of duty cycle, phase shifting or other fancy stuff.
The sphere spins with good torque, i.e. there is a lot of friction between the sphere and the white stone slab, which lies under the coil.