Thursday, 22 January 2015

Adjustable DC voltage using Lm317


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

Data Sheet

headers are for Vin and Vout
two resistors in series

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