Variable resistor (pencil)
1:28
Variable resistor (pencil)
Apr 23, 2013
Khan AcademyBrit Cruise
Looking for a new CV source? Draw it! Graphite is conductive, and with enough of it you can create a variable resistor! In this example we’ve connected an offset voltage to one side of the pencil drawing and ground to the other. When a cable is touched to any point in between an amount of that voltage can be routed to a destination (similar to the wiper on a potentiometer). In this way, control voltage sources of all sorts of customizable shapes, sizes and designs can be created and experimented
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