| 摘要 |
PURPOSE:To simplify the circuit constitution by connecting the variable resistor with its one end earthed to the output end of the amplifier circuit which amplifies the signals to be mixed and then connecting the sliding terminals to the signal routes of right and left channels via the resistances provided independently. CONSTITUTION:Signal source 8 for the mike, the tape recorder, the record player and the like and to be mixed is connected to amplifier circuit 9, and this output is connected to mixing level adjusting variable resistor 11 one end of which is earthed via coupling capacitor 10. Then the sliding terminal of resistor 11 is connected to the joint between resistances 12 and 13, and the other end of 12 and 13 each is connected to right-left channel signal routes 14 and 15 each. In such way, the crosstalk between the right and left channels is decided by the output impedance of each channel as well as the value of resistances 11-13. Accordingly, the sliding terminal features the dropped earth potential when resistance 11 is set to the minimum level, and thus the crosstalk shows zero virtually. |
