| 摘要 |
PURPOSE:To reduce troubles to the environment and to expand and improve functions by providing a headphone amplifier, a changeover switch, and a resistance which limits the variable range of a sound multiplex balance volume control and switching circuits properly. CONSTITUTION:Changeover switches D and D' are connected to B and B' by a way of using similar to normal accompaniment. Consequently, outputs of heads 5 and 5' are mixed with a narrower variable range than those applied to a tape mixing amplifier 8 by resistances 31 and 32 and a sound multiplex balance volume control 7' and a tape playback signal is applied to the tape mixing amplifier 8' through a resistance 33 and contacts B and D, but a micro phone signal from a microphone volume control 4 is not applied to a microphone tape mixing amplifier 10, so the microphone signal is not listened to through a speaker 14. When headphones are plugged in a headphone jack 13-2 in this state, the tape playback sound and microphone reinforced sound whose mixing ratio is adjusted by the sound multiplex volume control 7 are mixed and listened to, so that the functions are expanded. |
