This should be easy...Circuit Diagram help please.

[ReallyStuck]

Hi,

This is my first post, just looking for some assistance please with achieving the following:

I have 1 socket(I intend to attach a variety of devices to, the details are not important) and 6 cells that I intend to have connected to the socket via a switch which will enable me to select a given combination of those cells.
The cells.
2xCR123 (3V battery)
4xAA(1.5V battery)
The layout will be such that there will only ever be 1 type of battery connected, and they will be placed in pairs(2 cells in series). e.g. I will have either just the one pair of CR123 batteries, or two pairs of the AA batteries at any given time. (I say this as the circuit will be similar to that of a torch that can accommodate multiple battery types).

I've attached a diagram of the components.

My intended combinations(or rather options that are to be selected by the switch) are as follows:
1 - OFF
2 - 2xCR123(series) = 2x3V = 6V
3 - 4xAA(series) = 4x1.5V = 6V
4 - 4xAA(parallel) = 4x1.5V/2 = 3V
5 - 2xAA(series)[1st pair] = 2x1.5V = 3V
6 - 2xAA(series)[2nd pair] = 2x1.5V = 3V

So any help with coming up with a nice and concise circuit diagram would be greatly appreciated. (I've no idea what type of "switch" is required either.)
cheers.

[JMACgyver]

Howdy.

I do this type of thing a lot, but having it be concise and easy is not usually possible.
I did like the challenge though.
It did become a lot neater and easier, with less components if I eliminated combination 4, the parallel 4AA/2=3V.
If you can live without that, the below circuit should work.
I'd rather not go into detail about why #4 wont work easily, but i can PM you the other diagrams i have where i diagrammed the problem.

Hope this helps!
--Electro--
aka The Other David

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Switch is a rotary 2-pole/5 or 6 position.

Now, if you wanted to add a separate switch to engage the #4 function, that *can* be done.