switching between two outputs

[mingasss]

Hi guys, I would really appreciate if someone could give me advice on how to build circuit for this case. On my circuit input I have slowly arising voltage from 0V to 10V, and on my circuit I have 2 outputs. When input has 0V-5V, first output has to be active, but when voltage rises from 5V-10V, first output has to deactivate and second output become active. And vice versa, when voltage decreasing to less than 5V, second output has to deactivate and first become active.
5V is the point where output changes, depending on voltage.
I was thinking to use 5V or 6V relay which gets active when voltage gets close to 5V. But relay coil will always use energy, which is not good in my case, as I need as much as possible voltage and current on outputs. Can you help to project switching between two outputs using transistors or comparators circuit? Thanks in advance.

[Richard]

Probably the easiest method would be by using a comparator set to switch at 5V. Use either a special comparator IC, or something like a 741 op amp with the non-inverting input tied to 5V (via a trimmer pot if you wanted to be precise about the switching point) and your input voltage to the inverting input. Difficult to be more specific without knowing more precise details about your application.

[mingasss]

Thanks for your quick reply. To make it more clear I have drawn a plan of my circuit and hosted this picture here: http://postimg.org/image/hr0xq8jth/
In my circuit I use power step up booster, because on main output I need reach 5V as quick as possible, but when voltage reached more than 5V on main input, I need to switch from step up booster direct to main output, otherwise I will damage my power step up booster. I am not very strong in electronics, its still not clear for me how to use comparator, as my voltage rising from 0V to 10V on main input. so how can I compare my voltage on comparator if, for example, on main input will be 0,5V? I would really appreciate if you would draw a quick plan to explain. Thank you very much in advance.

[Richard]

I think you need a grounding in circuit theory. The best book I have come across is "The art of electronics" by Horowitz and Hill - available from online retailers. BTW, in your diagram, if you are using a relay to switch the input voltage, surely the diodes are redundant?

[piratepaul]

A good book on opamps...