TSURANAGI
UM001 REV1.1
JULY 2021
7
in the circuit design. To achieve low noise, we also focused on thorough
common mode noise elimination. In order to ensure stable playback at all
times without interference from radio waves and other sources, we adopted
a configuration that eliminates common mode noise to the greatest extent
possible, as it is expected to be used outdoors. In order to achieve both
low noise and low distortion, an ultra-low distortion audio differential
line receiver with a high common mode noise rejection ratio over a wide
bandwidth was used for the common mode noise rejection circuit. We also
wanted to incorporate the MUSES72320 electronic volume, which we feel has
advantages in terms of performance and sound quality, and to overcome the
problem of different attenuation between the positive and negative side
circuits of the signal (although the error is small to begin with because
it is an electronic volume), we converted it to unbalance in the first stage
of the electronic volume. This is one of the reasons. In order to make the
most of the limited resources of portable amplifiers, the unbalanced
circuit in the middle of the amplifier is designed to have low power
consumption and a spacious mounting area.
