| 摘要 |
<p>PURPOSE:To drive a video disc player while the revolution of a tape drive motor is detected or to apply a video signal to a television receiver, by detecting said revolution in the titled device with a revolution detector. CONSTITUTION:An adaptor 3 is inserted to an insertion port 13 of an audio playback devic 1. Setting a video playback device 2 to standby, the device is started. Thus, since a motor 14 is rotated, a slit disc 21 rotates in a specified speed, resulting that a pulse signal from a photo interrupter 22 appears. This pulse signal is inverted into a positive pulse at an inverter 25 and this pulse is fixed to a high level with a re-trigger monostable multivibrator 27, this is gain inverted at an inverter 26 to turn on the device 2 with a video playback device control circuit 28 via a transistor 32 and a relay 31. Thus, the video signal is applied to a television receiver 12 to picture video such as the lyric lines and musical notes.</p> |
