作者: 普羅 時間: 2017-3-5 16:25 標題: 5V數字功放問題
見平平地淘左PAM8403 5V數字功放板, 但開關機時沖激聲好勁下, 有咩方法解決?
作者: 鄧記 時間: 2017-3-5 17:57
http://www.ebay.com.au/itm/Dual- ... 2141725.m3641.l6368
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作者: 普羅 時間: 2017-3-5 18:46
鄧記 發表於 2017-3-5 17:57
本身用USB 5V供電, 唔會再加多舊野拎電
作者: diputs 時間: 2017-3-5 19:53
本帖最後由 diputs 於 2017-3-5 20:16 編輯
PAM8403有一隻Mute腳 (Pin5)，可試試將果隻腳(接PVDD)甩開原來5V，再經電阻電容(或單接電容，利用IC內部的上拉電阻)調延遲時間配合聽唔到POP聲。
The MUTE pin is an input for controlling the output state of the PAM8403. A logic low on this pin disables the outputs, and a logic high on this pin enables the outputs. This pin may be used as a quick disable or enable of the outputs without a volume fade. Quiescent current is listed in the electrical characteristic table. The pin can be left floating due to the internal pull-up.
When VDD=5V, Vmute=0.3V, I mute is approx. 3.5mA
