Digital Voice Recorder
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Digital voice recorder- built, designed and packaged with time to market constraint in mind implementing microphone input, 8th order Butterworth low pass filtering, level shifting, A/D conversion, ROM and powered amplification of speaker output to ensure integrity of playback synthesis.
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25 Watt Dual Polarity Power Supply25 Watt dual polarity power supply - designed built and packaged for point of sale consumer with time to market constraint in mind. Utilizing common techniques of step down power transformation, rectification, capacitance smoothing with regulated variable output. Also employed various circuit protections with fuse/circuit breaker components to protect the resistive load from current overload.
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SDR XCVR for Raspberry Pi
Design and build a 40 meter digital radio based on RadWav Ski-Pi40 architecture for Tx/Rx through a Software Defined Radio (SDR) and Raspberry Pi B+ interface with a gnuRadio and USRP both open source projects. Initially for research and cognitive radio security for opportunistic radio access. Now working towards ARRL licensing for emergency response services.