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Idea for simple BFO pinpointer from cell phone headphone jack or microcontroller

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  • Idea for simple BFO pinpointer from cell phone headphone jack or microcontroller

    I'm sure this has been thought of before so if anyone has done this i'd love to see some links! My idea is that you could use the external microphone input on a smartphone with a colpitts oscillator as the input device. From what i understand most of the chipsets that smartphones use are limited to the hundreds of kilohertz range but this should work fine for our purpose. output could be sent to a speaker through the same jack. The software could be one of two things. It could either be already available oscilloscope software which graphs the input as a waveform or a custom built one which could be designed to better interpret the data. It could make this a very cost effective pinpointer for only pennies for some basic components.
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