Abstract: The present teaching relates to a method/apparatus for a magnetic sensor. The apparatus of the magnetic sensor resides in a housing and includes an input port and an output port, both extending from the housing. The apparatus also includes an electrical circuit which comprises a magnetic field detecting circuit, configured to detect an external magnetic field and output a magnetic induction signal that is indicative of information related to the external magnetic field, an output control circuit coupled between the magnetic field detecting circuit and the output port, and a state control circuit coupled with the output control circuit and configured to determine whether a predetermined condition is satisfied and signal the same to the output control circuit.

Abstract: The present teaching relates to a magnetic sensor that comprises a housing, an input port and an output port, both extending from the housing and the input port being connected to an external alternating current (AC) power supply, and an electrical circuit. The electrical circuit comprises an output control circuit coupled with the output port and configured to be responsive to a magnetic induction signal to control the magnetic sensor to operate in a state in which a load current flows through the output port when a predetermined condition is satisfied, and operate in another state when the predetermined condition is not satisfied. The operating frequency of the magnetic sensor is positively proportional to the frequency of the external AC power supply.

Abstract: A driver for a bicycle dynamo connected to the dynamo includes a first driven wheel (132) and a second wheel (136) driving the first wheel (132). The first wheel (132) is mounted on the dynamo. A first magnetic area is set on the surface of the first wheel (132). The second wheel (136) is arranged in a distance from the first wheel (132). A second magnetic area (137a) is set on the second wheel (136). The second magnetic area (137a) is opposite to the first magnetic area (134). When the second wheel (136) is rotated by a user through the pedal, the second magnetic area (137a) rotates. The magnetic force generated between the second magnetic (137a) and the first magnetic (134) drives the first magnetic area (134) rotating to drive the dynamo connected to the first wheel working.

Abstract: An electrical heating facility includes an electrical heating element attached to a base and having two terminals, and a temperature sensing device having two conductors for electrically coupling to the terminals of the electrical heating element and to detect the temperature of the heating element. The temperature sensing device may be easily secured to the base with a magnetically secure device by the users, and may also be easily disengaged from the base when the temperature sensing device is hit or collided by people or objects inadvertently.