Voltage rating of 3.5mm jack audio output - Electrical Engineering Stack Exchange
Phone connector (audio) - Wikipedia
No, really, the headphone jack is more useful than you think! | TechCrunch
Amazon.com: Volt Plus Tech DAC-USB C to 3.5mm Headphone Jack Audio Aux & C-Type Fast Charging Adapter for Samsung/LG/Google/Apple iPad and Many More Devices with C-Port : Electronics
Buy Wholesale China Brand New Lightning To 3.5mm Headphone Jack Adapter, White 3.5mm Audio Aux Converter For Iphone & Lightning To 3.5mm Adapter at USD 5.78 | Global Sources
The Physics of How Your Earphone Jack Works (Just in Time to Say Goodbye) | WIRED
Headphone Jacks and Plugs: Everything You Need to Know - Headphonesty
Volt Plus Tech USB C to 3.5mm Headphone Jack Audio Aux & C-Type Fast Charging Adapter Compatible with Your Samsung LG Google Apple iPadsand Many More Devices with C-Port
Audiophile 101: Headphone Connections and Terminations | Bloom Audio