spdt on-off-on - choosing between 2 resistors but the middle position is off

[jimbob]

I have a spdt switch i wired to switch between 2 different resistors with the middle for common. The problem is I didnt realize this was the on- on- on as the others so when I switch between the 2 choices theres 3 positions.

What can I do with this and still keep the 2 choices without the dead middle. O r is there something else I can do with the middle? Does it have to be off?

[GibsonGM]

You could jump one side to the middle and it would be "on-on-and the same on as the middle" (SPST), I guess....

[MarcoMike]

mh... not really sure about that solution... you would have the selection bertween R1 and R1parallelR2

Instead there are many wiring options that result in a 3 resistors selection:

    °--------res1---|
°   °                    |
|   °--------res2---|---a
|            |
|---res3--
|------------------------b

this is one of those... options are: R1p(R2sR3), (R3sR2), R2 

s:series, p:parallel