Re: Good non surface mount MOSFET to drive injectors?
Posted: Thu Jan 09, 2014 5:27 am
http://www.megamanual.com/ms2/pickups.htm
A Hall effect sensor is an "active", magnetic field presence sensor. It is based on the Hall effect. The principle was discovered in 1879. When Edwin H. Hall applied an current to a piece of metal inserted between two magnets, he found it created a secondary voltage in the metal at a right angle to the applied voltage. In the sensors we are concerned with, the Hall effect is used to change of resistance in a semiconductor in a magnetic field, and this is then used to switch an output voltage from high to low, or vice versa.
The Hall effect sensor consists of semiconductor material which will conduct current when the material is subject to a magnetic field. These types of sensors require a "flying magnet", wheel. Instead of teeth on the wheel, as in a variable reluctor sensor, you must have small magnet and a shutter wheel.