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Analog

I honestly was not sure where to start with my research on the necessary circuitry for driving headphones, however, here is what I could find. For reference, the headphones I possess are 80 Ohm impedance, so that’s what I’ll be basing it off of. Common earbud and headphone impedances I see are 16 and 32 Ohm.

Line Level

“Line outputs usually present a source impedance of from 100 to 600 ohms. The voltage can reach 2 volts peak-to-peak with levels referenced to -10 dBV (300 mV) at 10 kOhms”

Output Amplifier

Operational Amplifiers

Input Preamp

Analog Audio Mixer