If you have 10 modules you want to power up, and you want to have a way to power 1 of them, or 2, or 3, etc., is there a 'standard swith-type' or some 'standard' way of doing this?
For powering a row of DC items, I thought of a rotary switch in which there is a diode between the lines for each unit, so as you rotate the switch the power feeds all below that selector position. But that means that you have to put in bigger and bigger current spec for the diodes, because the top-most one may have to feed all the modules. Doesn't sound a very efficient use of diodes.
Any thoughts? {please let me know if my question isn't very clear!}