Application circuit of uPC1892

The application circuit of uPC,1892 is shown in Figure 5-24. The circuit uses a bridge rectifier capacitor to filter the 12V power supply, and the 5V control
voltage is obtained by using a 7805 step-down. The sound field mode is controlled by pins 7 and 8 of the IC: when pins 7 and 8 are both connected to ground , the sound field mode
is off ; when pins 7 and 8 are connected to +5V, the sound field mode is a concert hall effect; when pin 7 is connected to ground and pin 8 is connected to +5V It is a cinema effect
; when pin 7 is connected to +5V and pin 8 is connected to ground , it is a simulated stereo effect. RPi in the circuit is the music effect control, which is mainly used to
control the two rear surround sound signals. RP2 is the balance control of the front left and right channel output, (h) 3 is the
volume , and (v) 4 is the rear The surround sound volume control is designed for the front channel bass control, and the RP6 is the front treble control.
    p PC1892 can be pressed between the audio source and the power amplifier when in use. Its configuration is shown in Figure 5-25. The audio source can come from
cI), VCD, LD or the audio output of a video recorder or TV. If the input signal is mono, the analog stereo
working mode should be selected. The combination of four power amplifiers requires that the front power be more than twice the rear surround power. The op/PC1892
is a matrix phase-shifting surround process. If the surround output signals can be output after a digital delay process of 5 milliseconds, then
The positioning and reverberation effects of the entire surround circuit are more obvious.