| 摘要 |
Concentrated lines of flux through two loosely mounted magnetically contacting reeds (12, 14) are intermittently mechanically interrupted by breaking the contact infinitesimally, thus deriving a near-maximum generated EMF in a coil (20) surrounding the contact. A piezo transducer (28) driven in feedback arrangement by an oscillator (30) provides an energy-efficient drive for a hammer (32) that irregularly strikes one of the reeds. A compass based on this irregular modulation of a flux path is shown and other devices based upon this principle are mentioned. |
