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These tools will assist you in building electronic circuits.
This calculator is used to find either the value of the voltage adjustment resistors or the output voltage. Typically R1 is 220 ohms or 240 ohms, but it could be some other value. Select a value for R2 and hit the Calculate button. The LM317 output value is reported in volts.
R1 resistor (ohms)
R2 resistor (ohms)
Output Voltage (volts)
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