| 摘要 |
PURPOSE:To secure an easy handling of a stereophonic tape recorder with a simple constitution, by connecting electrically the external input jack of the right and left channels each to the input terminal of the amplifying circuit of one of the two channels having the recording mode via an LL change-over switch. CONSTITUTION:The record one a magnetic tape is applied to the headphone jack 13 via the magnetic head 1, amplifying circuits 2 and 3, resistance 4 and amplifying circuit 5. On the other hand, the voice of a student is converted into the electric signal by the built-in mikes 6 and 16 in case when no external mike is connected to the input jacks 7 and 17. The electric signal is then supplied to the amplifying circuit 18 via the LL switches 26 and 29 plus the switches 27 and 28 each. In case when the external mike is connected to the jacks 7 and 17, the switches 27 and 28 are turned off with the input applied to the input terminals of amplifying circuits 9 and 18. The output of these amplifying circuits is supplied to the magnetic head 14 via the circuit 19 and the equalizer amplifier 15 to be recorded, and at the same time the output of the amplifier 19 is supplied to the headphone jack 13. In such way, an easy handling is secured in a simple constitution. |
