Magnetic Sequence Controller
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
A technique is described whereby magnetic material, such as Wiegand wire, used in conjunction with sensing coils and flip-flop circuitry, provides an inexpensive sequence controller. When AC excitation voltage is applied to the Wiegand wire, the core saturates in either direction, producing pulses when the AC voltage is rising and when the AC voltage is falling. When a sense coil is wound over the wire, pulses are able to be detected. The pulse position depends on the field strength of the excitation voltage. The pulse position, as shown in Fig. 1, may be altered by bringing a magnetic field in close proximity to the wire. When this technique is used in conjunction with the flip-flop circuitry, as shown in Fig. 2, a sequence controller is attained.