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Step 5Power Up
Double-check all of your wiring and connections. Be especially critical of your solder connections on the header pins. None of your circuit should touch the metal box of the Altoids tin.
Rotate the rotary switch to the desired output and insert one fresh (or, even not so fresh) AA battery into the holder. Using a meter, measure the output from the header pins. It should match the voltage that you selected with the rotary switch.
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