Simple switching-why can't I figure this out?!

[Noplasticrobots]

Ok, I don't know why I can't figure this out! I want to install a switch on a Bazz Fuss that selects between two different diodes. What type of switch do I use? I tried a SPDT with the common terminal (center) wired to the collector of the tranny. Then I connected the negative side of both diodes to the base and the other ends wired to the open switch positions. It didn't seem to work.

On a similar and even simpler switch wiring question: how do I wire a switch at the output to select between two different capacitors?

Thanks for all your help!

[ezanker]

I'm not sure what your diode switching problem is as your description sounds correct...

For caps I like to use the fact that capacitance adds up when caps are put in parallel.  Therefore you can put 2 caps in parallel and use an SPST switch to break the connection of one of them.


                        SPST
                           /           
        ------CAP2---   --
------|                       |---------
        ------CAP1-------

[aron]

Maybe it's working. Diode changes can be subtle.

[Noplasticrobots]

I just realized-I might have an on/off SPDT slide switch (it's unlabeled); I need an on/on SPDT don't I? d'oh!!