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Transform a 2-channels sound to 4-channels sound

While browsing an electronic archive I found a nice way to transform a 2-channels (L-left, R-right) sound to a 4-channels sound (L, L+R, R and Rear). All this is done with a single IC : uPC1892.
Here are some features of this IC :
• Three surround modes are available: movie, music and simulated
• Built in volume and balance control (All control voltage: 0 V to 5 V)
• Built in tone control (bass, treble) (All control voltage: 0 V to 5 V)
• Built in L+R output for woofer SP
Here is the application schematic :

Posted in Non-MCU projects.


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  1. Renante Cagungao says

    i am interested to work for this schematic but it is hard for me to work on it. can you give me the PCB layout or send me more information regarding on it in my email add,
    thanks



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