The secret is a small motor actuated volume control potentiometer normally find in audio home systems.
秘密是一个小马达驱动的音量控制电位器通常会发现在音频家里系统。
In the contemporary acoustic equipment, usually USES the potentiometer to carry on the volume control.
在当代的音响设备中，通常采用电位器进行音量调节。
When frequently carries on the volume control, also is easy to cause the potentiometer to wear appears the breakdown.
但经常停止音量调理时，又轻易使电位器磨损而呈现毛病。
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