A couple of guys in Holland or Germany created the Magnic Bike Light.
http://urbanvelo.org/magnic-light/
I understand eddy currents, but am skeptical that the amount of power available is enough to drive the LED. They claim no moving parts other than the rim of the bike wheel.
We are trying to predict the cross-polarization pattern of 4-element and 6-element Yagi antennas at around 220MHz. The vendors have co-polar pattern data but not cross-polar patterns. Does anyone have any measured data on typical Yagis? The Yagis in question are mounted with elements horizontal...
We design exercise equipment, some using DC drives and some using AC drives. They are in-house designs. The AC drive is a simple V/F type and exhibits poor PF (0.7 or less) owing to its front-end being a simple bridge rectifier and capacitor design. The supply is 240V 60Hz single-phase. The...
I need to create a drawing of an encoder wheel, ie one that has an even # of light and dark segments equally spaced around a circle. Is there a way in Visio 2007?
thanks
