Infrared Audio Telecommunications System

Designed and implemented the modulation and demodulation subsystems for a wireless audio transmission system using infrared technology, originally conceived as a baby monitoring solution. Taking ownership of the entire receiver PCB from design through to soldering, I engineered a frequency modulation circuit using the CD74HC7046 phase-locked loop chip, achieving a 43kHz carrier frequency optimized for the IR diode's operational range. Through comprehensive circuit analysis and iterative testing, I calculated precise component values to handle human voice frequencies (50Hz-17kHz) and designed integrated low-pass filters to ensure clean signal recovery. The system successfully transmitted clear, discernible audio at the specified 10cm range. I independently validated both subsystems through oscilloscope analysis before integration, demonstrating strong analytical skills in comparing theoretical calculations against experimental results. This project showcased my ability to translate datasheets into functional circuits, debug complex signal processing chains, and deliver reliable hardware solutions within specified constraints. Developed using Multisim and Ultiboard for PCB design.

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