Reply to "Narrow Version of DIY 317 Voltage Regulator Board, with Build Files"

FWIW, no extra components required, just a set of jumpers.  I just use one of the diodes in the bridge for the half-wave option.  Here's how I did a switchable board, in this case this is mated with an eBay switcher to provide power at greater efficiency than linear regulators.

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This is the board and the regulator board sandwiched below it.

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