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I`m designing a circuit and I want to turn it on and off. I have two linear regulator and a step-up switch regulator in it. If I use a switch that connects the input pin of the regulator to the battery positive pole or open it, do I have a ON/OFF button or can I have malfunction doing so?

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    \$\begingroup\$ Perhaps you could provide a schematic, would help a lot. ... Actually on second thought, I think I get it. Yes you can have a switch there. No problems. \$\endgroup\$ – Dzarda Nov 7 '13 at 19:45
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Like this?

schematic

simulate this circuit – Schematic created using CircuitLab

That'll work just fine. Regardless of the regulator type and how many are connected to the battery.

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If your switch is momentary then there are some additional complexities. Linear has some nice ICs if you want to avoid any headaches with this and make it a pretty "brain dead" design.

http://cds.linear.com/docs/en/datasheet/2955f.pdf

They have nice schematics in there that show you exactly how to do what you're trying to do. If it's not a momentary switch then of course the answer that Samuel provided above is great.

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