iPhone 4 teardown reveals $188 cost to build - CNET
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AR-4i : Audio Interface for iPhone 4
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Use FaceTime with your iPhone or iPad - Apple Support
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XLR Mic&6.35mmAdpt w/Lghtng Cn | Saramonic
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Archimago's Musings: MEASUREMENTS: Apple iPhone 4 & iPhone 6 audio output.
impedance - Electronic aspects of iPhone 3.5mm audio output - Electrical Engineering Stack Exchange
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Samsung makes a quarter of the parts in the iPhone 4: Infographic | Digital Trends
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