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Switching a Switch

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Hello All,

I can’t get my head round what I think is a simple problem.

I have an electronic switch (it’s on a radio control plane) that operates a camera shutter by sending 5v to the USB cable.
This works fine but it switches the ground not the positive.
When I plug in my video out to the camera the shutter fires constantly as this has a negative lead and so completes the circuit.
(It’s slightly more complicated as all the components on the plane take their power from the same source)

Is there a simple circuit that can turn this around, so that the 5v positive is the one that’s switched.
I can’t take the original switch apart, its SMD stuff.

I’m thinking just a couple of transistors will do it, but…



You really need to rewire the switch, to fix it properly.
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