Hallo!

Falls die PWM Frequenzen nicht sehr hoch sind, sollte einfacher (Audio)Mixer mit eintellbaren Eingängen ausreichen z.B.:
Code:
                                                             VCC
                                                              +
                                                              |
                                                             .-.
                                                             | | Rc
                                                             | |
                                                         Rb  '-'   C2
                                                         ___  |+[/
                                                  C1  +-|___|-+-[|-->
                                                      |       | [\
                                                   \] |     |/
         +-------+-------+-------+-------+-------+-|]-+-----| T
         |       |       |       |       |       | /]+      |>
        .-.     .-.     .-.     .-.     .-.     .-.           |
       R| |<-+ R| |<-+ R| |<-+ R| |<-+ R| |<-+ R| |<-+       ===
        | |  |  | |  |  | |  |  | |  |  | |  |  | |  |       GND
        '-'  |  '-'  |  '-'  |  '-'  |  '-'  |  '-'  |
         |   |   |   |   |   |   |   |   |   |   |   |
        ===  |  ===  |  ===  |  ===  |  ===  |  ===  |
        GND .-. GND .-. GND .-. GND .-. GND .-. GND .-.
            | |     | |     | |     | |     | |     | |
           R| |    R| |    R| |    R| |    R| |    R| |
            '-'     '-'     '-'     '-'     '-'     '-'
             |       |       |       |       |       |
   PWM1 >----+       |       |       |       |       |
                     |       |       |       |       |
   PWM2 >------------+       |       |       |       |
                             |       |       |       |
   PWM3 >--------------------+       |       |       |
                                     |       |       |
   PWM4 >----------------------------+       |       |
                                             |       |
   PWM5 >------------------------------------+       |
                                                     |
   PWM6 >--------------------------------------------+

(created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)