| 摘要 |
PURPOSE:To obtain the bias trap characteristics of a wide band and to stabilize the working of a tape recorder, by inserting a bias trap circuits connected in series to a recording head circuit. CONSTITUTION:A bias signal given from an oscillating circuit 7 is superposed on the audio signals applied to recording heads 5 and 6 from left and right amplifying circuits 1 and 2. Thus a recording operation is carried out. The bias signal is attenuated by bias trap circuits 3 and 12 as well as 4 and 13 which are connected in series to the input circuits of the heads 5 and 6 respectively and therefore does not mix into the circuits 1 and 2. Furthermore the synthetic characteristics of those bias trap circuits have wide band characteristics owing to their two-step cascade connection. Thus the bias signal can be attenuated satisfactorily. |
