Internal circuit principle of TA8173

The internal circuit principle and application are shown in Figure 5-26. It has two input terminals and two output terminals.
The external selection switch SA on pin 13 is used to select the surround sound or direct working state. It can
be seen the ordinary two-channel signal passes through 14 and 16 After pin input, it is amplified by the buffer amplifier and divided into the main channel and
the sub-channel obtained by subtracting R and L. After passing through the low-pass filter , it undergoes phase shift and delay, and then passes through the external selection of pins 1 and 3.
The selection control of the switch is a forward addition with the R channel of the main channel and an inverse addition with the L channel. After passing through the low-pass filter
, it is output from pins 9 and 11 respectively . The synthesis ratio of the sub-channel is 2 ( R - L) can
be adjusted by the potentiometer RP connected between pins 2 and 15.
    The working voltage of TA8173AP is 5~12V, the quiescent current is 6.3mA at 10v, the frequency response is 8kHz
~ 20kH, total harmonic Wave distortion is 0-026%o