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How LM317 regulates the voltages

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smhn72@gmail.com

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I want to connect the three Pins of LM317 to take a 3v DC and facing trouble to connect the PINS in this way that it will give me 3v

i have a step down transformer of 15v 3ah and i have used a brige rectifier to convert this 15v ac in to DC and now the main issue is that i want to convert this 15v dc to 3v dc

for this i m using LM 317


Plz any body help me how i can regulate this 15dc to 3dc the voltage
 

alexan_e

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Use this scheme **broken link removed** and calculate the resistor for 3v.

I suppose there is a capacitor after the diode bridge.
 

Tahmid

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All your required information is in the LM317 datasheet:

Fairchild: www.fairchildsemi.com/ds/LM/LM317.pdf
TI: www.ti.com/lit/ds/symlink/lm117.pdf

From the Fairchild datasheet:
2958191900_1354205719.png


From the TI datasheet:
2777581100_1354205796.png
 

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