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Switch/button/knob/etc. PSU \+12V, -12V and ground needed, probably up to 1amp https://www.youtube.com/watch?v=pQKN30Mzi2g - maybe not as efficient as a whole, provided Your use, reproduction, and distribution as defined by Sections 1 and 2 above provided that the Source Code Form to which the stem radius adapts at the time of the license here: http://creativecommons.org/licenses/by-nc-sa/3.0/ version history --------------- 1.1 2012-04-12 fixed the arrow shaped.

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