vielleicht gehts auch so:


Code:
       --------------o
                     |
                     |
                     |
                    .-.
                    | |   LAMPEN
                    | |
                    '-'
                     |
                     |                   5k
                     |                  ___
                     o------>|---o-----|___|-----o
                     |           |       A       |
                     |           |       |       |      |
                    .-.          |+              |    |/
        Shunt 3 Ohm | |         ===              V ->-|
                    | |         /-\              -    |>
                    '-'          |               |      |
                     |           | 10µ           |
                     |           |               | Optokoppler
                     |           |               |
                     o-----------o---------------o
(created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)