Otomatsu Portable Headphone Amplifier
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The satisfaction of enjoying audio is to be able to Do-It-Yourself (DIY)



- Adopt High Performance, High Fidelity OP AMP LME49710

- High Performance, Low Distortion IC LME49600- The amplifier's 

  overall gain can be adjusted between 16 Ω  to

  300 Ω  to match the efficiency and impedance characteristic of

   any headphones.

Easy build and Fexibility for upgrade

Portable cast easy to carr

- Adopt the thumb screw fasten system to make exchange of battery easier

- External DC power input jack

Audio performance

Frequency response  10Hz - 60kHz -1.5dB

THD+N      0.05% @32Ω lord

Left bottom   10Hz base clean sine wave

Middle             20kHz treble  same level of 10Hz

Right bottom   THD+N is very good level , 0.05%