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I designed power line communication hardware because I intended to transmit audio waves from one end to another using power lines as a medium of transmission. The sound wave was modulated by frequency using a 200 kHz square wave which would further be demodulated using a demodulation circuit operating at the same frequency. Theoretically, everything appeared achievable and easy. Trying to realize the circuits proved that the reverse was true for reasons to be explained later. Switching to sinusoidal carrier achieved my goal, if I get over security problems.

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