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Headphone Jacks and Plugs: Everything You Need to Know - Headphonesty
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Why isn't the 2.5mm audio jack standard nowadays instead of 3.5? - Quora
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Headphone Jacks and Plugs: Everything You Need to Know - Headphonesty
3.5mm Stereo Audio Cable
Standard Series 3.5mm Stereo Mini Plug to 2 RCA Plugs Audio Cable 10ft
Headphone Jacks and Plugs: Everything You Need to Know - Headphonesty
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Right-Angle 3.5mm Stereo Plug to Pigtail Cable : ID 1700 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits