Switching a solenoid between 2 different AC/DC adapters?

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hi,

i have build circuit turn solenoid on , off arduino (actually it's 10 solenoids, that's not important right now), , make possible choose between 2 different ac/dc adapters because give me possibility have 2 velocity levels can trigger max/msp. of course never want positive side of 2 different ac/dc adapters connect, have make sure (in arduino code), never happens.

here's rudely made schematic spreading light on i'm trying achieve:



as picture shows, unsure connect positive side of solenoid. @ first thought easy do, don't think connecting positive side of solenoid each of ac/dc adapters positive sides work out, although i'm not sure.

regards
søren

for example: may consider 2 high-side switches switch between 9v or 24v power source. selenoid operated single low-side switch then.


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