+Vbatt o---UUUU---o---|>|---o---o--o HV
 ---------------+      100uH  |  ES2D   |   |
   8052 Type    |             |         X   |
microcontroller |          +--+      1M X   = 220uF
                |          |A           X   |
          T2OUT |------0---|| N-FET     |  GND    
                |      |   +--+         o--+
                |      X      |         |  |
                |  10K X      |         X  |
                |      X      |    110K X  |   
                |      |      |         X  |    
                |     GND    GND        |  |   
                |                      GND |
                |                          |
            A/D |--------------------------+
             IN |
 ---------------+