How can I create a “master” switch with redstone?

Question

How can I create a "master" switch with sub-switches all connected to the master switch? When then master switch is turned on, it allows power to go to all the sub-switch (when the sub-switches are on). When a sub-switch is turned off, its output cannot receive power.

Answer

It sounds like you want a lot of AND gates (sub-switches) with one common input (the master switch) in each gate.

Note: The piston is just an example of an output device.

Try constructing one AND gate for each sub-switch and connecting all the "A" inputs to a single lever and each "B" input to its own lever.

When connected properly, each AND gate will not be able to output power unless both the master switch is on and its corresponding sub-switch is on.

Be aware that redstone signals will only travel 15 blocks. A repeater can be used to extend this.

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