| 摘要 |
<p>PURPOSE:To simplify a configuration of a circuit by using a driving transistor of an npn type, by fetching a muting signal from a connecting point of a high impedance coil of a plunger circuit, and a switch means. CONSTITUTION:A plunger 11 is provided with a low impedance coil L1 connected to a power source Vcc, and a high impedance coil L2 connected to a ground side in series to the coil L1, and controls an operation of a magnetic head 13. A driving npn transistor TR3 is connected between a connecting point of the coils L1, L2 and a ground, and drives the plunger 11, and also a switch means SW2 is connected between the coil L2 and a ground, and executes opening and closing in response to an attraction of the plunger 11 and turning on of a switch of fast forwarding and rewinding. In this way, when the means SW2 is opened, a muting signal is fetched from a connecting point of the coil L2 and the means SW2.</p> |
