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How safe is this? If I link two nodes that are wrong can I short something?

From my experience with circuits you can break shit fast and I'm curious how easy it is to tinker without being careful like you can when programming.

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small signal ins and outs like this should be perfectly safe. It's when you hook up power supplies without impedence to inputs that you have issues. You won't have access to that part of the circuit on the front panel

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