| 摘要 |
PURPOSE:To prevent mis-display and to supply a signal without distortion to the post-stage circuits, by connecting a capacitor and a resistor in parallel with a light emitting diode and connecting a diode in series with the said light emitting diode. CONSTITUTION:In case of the stereo mode, since an input terminal 1 goes to a high level once, the light emitting diode 6 is illuminated once, and it is distinguished soon to cause the malfunction of the illumination of the light emitting diode 2. But the capacitor 13 is connected, then the high level signal given at first in case of the stereo mode is absorbed by charging the capacitor 13, and the light emitting diode 6 is not lighted. Since the current flows through a diode 15, the capacitor 13 and a resistor 3 viewed from the terminal 1, the waveform at the terminal 1 is not increased and no wave shape circuit is required for the post-stage. A resistor 14 is used to discharge charges in the capacitor 13. |
