| 摘要 |
PURPOSE:To realize a stable reproducing action with high quality by leading outside the signal reproducing output via a rotary transformer or a brush and at the same time providing a stabilized DC power supply which supplies a direct current or a high frequency oscillating source to a magnetic matter or an impedance including said magnetic matter to the rotary system. CONSTITUTION:A rotary system 10 comprises a magnetic matter 3 which detects a change of a signal magnetic field generated from a magnetic recording medium as its own impedance change, a resistance 11 which detects a current change owing to the impedance change of the matter 3 as a voltage change, and a stabilized DC power supply 12 which supplies a direct current to the matter 3 via the resistance 11. While the signal reproducing output is led outside the system 10 via a rotary transformer 14. A DC power supply 13 is used to an external power supply which feeds the electric power to the power supply 12. Both power supplies 12 and 13 are connected to each other via a brush 15 such as a slip ring, etc. |
