* :

0.   :
-   -   
- encoder -  ,        (        4 )
- buttons -  , ..      / (     )

1. ZQ1 -    ,    (       ).
2.     (    ): 
 : R2,R3,C2 (   55,52,55),  ZQ1, C3
 : X1, SA1, T1, VD1-4, C5-C7, K1, VD2, R17, VT2, C8, R14, R12, R11, DA2

3. main GND -    ,    C5-C7   ,      3(!)  ,         .
