> PS: maybe I got it: >=20 > if I wind an inductor clockwise or anticlockwise nothing changes, right? Er, yes. If all windings are the same direction around the core, then the e= ach winding will have the voltage 'in phase' when measured 'start' to 'fini= sh'. If one winding is wound clockwise, and one wound anticlockwise, then t= he voltage measured 'start' to 'finish' on one winding will be the opposite= phase to the other winding. >=20 > Then that would make left to right and back to left window (triangular) > equivalent (but more comfortable) than left to right and back to left > (sawtooth). This purely a convenience of the physical winding. It is a lot easier to do= the 'triangular' method than the 'sawtooth' method, as the latter puts a s= ideways force on the wire at each end of the winding that will tend to make= it hard to start the next layer. It also puts a lump under the next layer = and if all layers have the lump at the same point then there is a physical = discontinuity in the winding that may cause failure of the wire. --=20 Scanned by iCritical. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .