F1 2AT
            _
      P -o_/ \oo--o-----------------------------o--------o
                  |                             |        |
                 --- C1                         |       ---  C3
   o N           --- 100n                       |       ---  100n
   |              |  630V                       |        |   630V
   |                                            |        o
   o              |                       TIC   |        |
   |             .-.                      206D  o A2     |
  .-.            | | R1                        _o_       |
 ( X )           | | 1k                        V_A       |
  '-'            '-'              D1        g / |        |
   |              o               ER900     ,   o A1     |
   o              o                 |<|   ,´    |        |
   |    o----o----o----------------o|\|- ´      |        |
   |    |    |    |                 |>|         |        |
   |    |    |    |                             |        o
   | o--o    oLDR |                             |        |
   | o .-.  .-.   o                             |       .-.
   |  `\ |  |V|  --- C2                         |       | | R3
   |P1 |`.  | |  --- 10n                        |       | | 1k
   |5k '-'| 'A'   |                             |       '-'
   |    o    o    o                             |        o
   |    |    |    |                             |        |
   o----o----o----o-----------------------------o--------o









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