Transient magnet field degaussing system

A bulk degaussing system for erasing various predetermined magnetic media, the system comprising:

• a coil form having an interior volume defining a degaussing volume and one or more accesses for receiving magnetic media to be erased;
• a pair of coils defining a first coil and a second coil wound around the exterior of said coil form, at least one of said pair of coils being formed with compound bends;
• and
• means for generating oscillatory electrical currents in said pair of coils.

A bulk degaussing system for erasing various predetermined sizes of magnetic media, the system comprising:

• one or more coils wound around a degaussing volume having a length L for generating a transient magnetic field,
• means for conveying said magnetic media relative to said degaussing volume;
• means for measuring the length of said magnetic media;
• means for determining the distance between said magnetic media and said degaussing volume;
• means for controlling said conveying means to position said magnetic media within said degaussing volume as a function of said distance determined by said determining means.

A circuit for controlling the phase difference of the oscillatory electrical currents between a first LC circuit which includes a first capacitor and a first inductor and a second LC circuit which includes a second capacitor and a second inductor, the circuit comprising:

• means for charging said first capacitor and said second capacitor
• means for triggering oscillation of said first LC circuit;
• means for detecting a predetermined angle of said first LC circuit and
• means for triggering oscillation of said second LC circuit upon detection of said predetermined angle.

A circuit for controlling the phase difference of the oscillatory electrical currents between a first LC circuit which includes a first capacitor and a first inductor and a second LC circuit which includes a second capacitor and a second inductor, the circuit comprising:

• means for generating a cycle signal for a first cycle of said first LC circuit;
• means responsive to said cycle signal for triggering oscillation of the electrical current of said first LC circuit;
• a first zero crossing detector for detecting zero crossings of the electrical current of said first LC circuit;
• a first gate responsive to said first zero crossing detector and said cycle signal said gate being enabled at zero crossings of the electrical current of said first LC circuit;
• and
• a first trigger signal generator coupled to said first gate and generating a first trigger signal to said second LC circuit when said first gate is enabled.