Power connector with noise canceling function

The position of D switch S is for karaoke function. In the figure, a speaker is used instead of a microphone (
an electret microphone can also be used specifically). The vocal channel is sent to IC2 through C9
for amplification. The amplified signal is sent to LC through C6 and R3
to be mixed with the accompanying sound signal and amplified. and then output to another
speaker 0 I_The ② and ③ pins of M386 are inverting input terminals.
According to the characteristics of stereo recording, the human voice
has the same phase in the left and right channels, while the mid- and high-frequency accompanying sound signals are
unbalanced recording. Therefore, after the inversion and addition of I4M386, the human voice is
canceled out. When the switch S is moved to the other side, lcl and IC2 act as power amplifiers
for the right and left channels
respectively, and the output power is ≤1 W. 6 As long as the components are installed correctly and the components are of good quality ,
    this circuit
can work normally without debugging. The volume and tone are controlled by the sound source itself. In order for the circuit to have a better
noise canceling effect, a cassette with better recording quality should be used. This circuit is relatively simple and cannot be compared with the dedicated karaoke
singing sound elimination circuit assembled with CXA1642 , but it will not affect your temporary behavior.