Hallo!

Einfacher geht´s nicht mehr... Bild  

MfG
Code:
                             1N400x
              +----------------|<-------------+
              |                               |
              |         1k/4W  I              |
              | .-----.  ___  ---> .-----.    |
      + >-----+-| LM  |-|___|-+----| LM  |----+---+----+-----> +
              | | 317 |   A   |    | 317 |    |   |    |
              | '-----'   |   |    '-----'    |   |    |
              |    |      |   |       |  ___  |   |    |
              |    +------+---+       +-|___|-+   |    |+
     Ui      ---        Strom         |  220     ---  ===     Uo
             ---                     .-.         ---  /-\
           µ1 |                   2k2| |<--+   µ1 |    |
              |                      | |   |      |    |
              |             Spannung '-'   |      |    |
              |                       |    |      |    |
      - >-----+-----------------------+----+------+----+-----> -



        Ui min = 19,25 V ( Uo max +  min. 7,25 V )

        Uo min = ~ 1,2 V       Uo max = ~ 12V 

         I min = ~ 1 mA