D1 1N4001
  +12v________|\|__________________
           |  |/|     C1  |       | 
           |    10,000uF _|_+     | 
           |       25vdc ___      | 
           |              |       | 
           |_____E C______|       |
   D2     _|_   _\_/_     |       |
   1N4001 /_\     |B      > R1    |
           |______| Q1    > 120   |
           |        PNP   > 2W    |
           > R2   TIP42   |       |
           > 120         gnd      |
           > 2W                   |
           |                      |
           |                      |           D4 1N4001
           |                      |________|\|________________ 
           |                            |  |/|     C2  |      |
           |                            |    10,000uF _|_+    |
           |                            |       25vdc ___     |
           |                            |              |      |_
           |                            |_____E C______|       _| K1 SW-200
           |                    D3     _|_   _\_/_     |       _| contactor coil
           |                    1N4001 /_\     |B      > R4    _| 28 vdc, 56 ohms
           |                            |______| Q2    > 120  |
           |                            |        PNP   > 2W   |
           |                            > R3   TIP42   |      |
           |                            > 120         gnd     |
           |                            > 2W                  |
           |____________________________|_____________________|
                                                              |
                                                      switch \
                                                              |
                                                             gnd
>