便携式耳机放大器 (Portable Headphone Amplifier)PartsR1 = 10K 1/4W Resistor Technical data: Current drain: 35mA per channel with 32 Ohms impedance headphones. Much less with higher impedance loads Output voltage: Above 2V peak-to-peak on all loads Sensitivity: 90mV RMS input for 2V peak-to-peak output Frequency response: Flat from 30Hz to 20KHz Total harmonic distortion @ 1KHz 10KHz: Below 0.05% on 32 to 600 Ohms load and up to 1.5V peak-to-peak output. Below 0.1% at maximum output Unconditionally stable on capacitive loads