My teacher require me use op-ampyou can open and see what controller use,and then find a pdf file to have more information :wink:
My teacher require me use op-amp
In 5.1, all speakers other than the subwoofer should be approximately 120Hz-20kHz (Dolby standard) or 80Hz-20kHz (THX standard). The subwoofer should be around 20hz-120hz (Dolby standard) or 20Hz-80Hz (THX standard).
As for converting stereo to 5.1, that's going to be more like creating a pseudo-5.1 signal, since stereo will not have the necessary multiplexing to encode true 5.1 audio. What you'll most likely be doing is to use the ProLogic technique of making the rear signals a combined mono of left and phase-inverted right signals. The center channel is slightly more complex, but if I remember it correctly, it is a slight phase shift of both left and right channels combined, with a high-pass filter.
design a convert circuit with INPUT is STEREO 2.0 and OUTPUT is 5.1 surround (use OP-AMP).
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