usb - Is voltage selector on 5v or 3.3v? - Electrical Engineering

I bought this USB to TTL converter and it came with the option to switch between 5v and 3.3v. I want to use it at 3.3v, but I'm not sure where the (grounder?) should be placed? Thanks, see image be

TTL-232R-3V3 FTDI, Future Technology Devices International Ltd, Cable Assemblies

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Stable and reliable chipset CP2102; Supports full range of STC single-chip microcomputer with output voltage 3.3V and 5V; Supports Windows 98SE, 2000,

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DROK USB step up boost converter input voltage: DC 5V, output voltage: DC 12V/9V, max output current:0.8A (12V)1A (9V) or 1A (9V). APPLICATION: the

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usb - Is voltage selector on 5v or 3.3v? - Electrical Engineering Stack Exchange

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