I need a separate supply to drive servos for a robot arm i'm building. i'm using a 10k potentiometer and in the examples they use 5k, i found with the 10k potentiometer the voltage would only change in the lower 1/4 of the potentiometer (hard to select a particular voltage). I swapped out the 220 Ohm resistor recommended and used two 500 ohm resistors in series, now the whole of the potentiometer varies the output voltage.
Useful examples
http://www.circuitsgallery.com/2012/11/variable-power-supply-circuit.html
http://www.eleccircuit.com/my-first-variable-dc-power-supply-1-2v-to-30v-1a-by-lm317/
Data Sheet
https://www.fairchildsemi.com/datasheets/LM/LM317.pdf
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| headers are for Vin and Vout |
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| two resistors in series |
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