Patent ID: 7106536

Claim:
A demagnetizer for an inductive load comprising: a driver circuit including at least one transistor, the transistor having a control region, a first controlled region, a second controlled region and a threshold voltage, the first controlled region being adapted for connection to a power supply, and the second controlled region being adapted for connection to the inductive load; and a ramp-down voltage circuit connected to provide an output voltage to the control region of the transistor, wherein the output voltage provided to the control region of the transistor when the ramp-down voltage circuit is in a first state is based on an input signal provided to the ramp-down voltage circuit, and wherein the output voltage provided to the control region of the transistor when the ramp-down voltage circuit is in a second state is ramped toward the threshold voltage of the transistor and oscillates based on the input signal to create a declining, oscillating current through the inductive load.