PPA 的 PCB 目前賣的為 1.1版
改版量產之前...還曾廣徵眾人意見
也接納了很多人的建議
如...
C1...增加為九顆
C4...擴大直徑為10mm...(這點我也是建議人之一
)
R9變動...並改為可變電阻...是一個重要的更改
如此...
可以很方便的調整~將OP工作在 A 類~的定電流源
....
...
原文如下
Changes in v1.1
renamed R9 → R10
renamed R8 → R9, changed R9 to a trimpot
added R8±
enlarged C4 to 400mil (10mm)
added 1 C1
removed 1 C2
added power planes around buffers
removed SO8 opamp pads
removed opamp power rail jumpers
removed DIP socket compatibility for the gain resistors
rearranged the layout to accommodate the changes