| 摘要 |
<p>PURPOSE:To prevent the malfunction of program searching in a high-speed reproduction mode by separating a tape speed control volume from a motor circuit in the same reproduction mode. CONSTITUTION:A changeover switch S2 is switched only in a high-speed reproduction mode, and a music space detecting circuit 6 is controlled with cut-off of its power supply line. At the same time, the power supply +B which is supplied to the base of a transistor TR7 provided between control terminals 4 and 5 of a motor circuit 3 is intermitted via a resistance R2 to control the ON/OFF of the TR7. In a high-speed reproduction mode both the circuit 6 and the TR7 are actuated to short-circuit between the terminals 4 and 5. Therefore, the motor current has no change regardless of the position of the rubbing terminal of a volume VR, and the tape speed is fixed. As a result, the signal frequency is not changed by the volume and fixed. In such a way, a malfunction with a program searching action is prevented.</p> |
