Robo India presents tutorial for High Current Power Supply using LM317 Voltage Regulator. This tutorial is in the continuation of AC to DC conversion and rectification tutorial of Robo India Basics of Electronics series.
1. Introduction:
This tutorial is in the continuation of AC to DC conversion and rectification. LM317 is used to get regulated power. LM317 is a variable voltage regulator. You can get variable power supply by changing value of R1 and R2
Download Data sheet LM317 Voltage Regulator.
1.1 LM317 Calculator
Output voltage as per R1 and R2 can be calculated from the following calculator. (Unit of R1, R2 is Ohms, Unit of V out is Volt.)
Value of R2 can be calculated as per Output voltage and R1 by the following calculator. (Unit of R1, R2 is Ohms, Unit of V out is Volt.)
1.2 List of parts
Following parts will be used to perform this circuit.
| S.No. | Item | Quantity |
| 1. | Basics of Electronics Kit’s Platform | 1 |
| 2. | Diodes | 2 |
| 3. | 1000 uF Capacitor | 1 |
| 4. | 10 uF Capacitor | 1 |
| 5. | 0.1 uF ceramic Capacitor | 1 |
| 6. | Jumper Wires male to male | 10 |
| 7. | LM 317 Voltage Regualtor | 1 |
| 8. | R1Calculator is provide in tutorial tocalculate value | 1 |
| 9. | R2Calculator is provide in tutorial tocalculate value | 1 |
2. Circuit
This circuit is in the continuation of rectifier circuit. The High DC Voltage ( Value depend upon the Transformer ratings) on the upper power line of breadboard was supplied. The output taken form LM317 Voltage regulator is taken to Lower power lines of breadboard. Click on image to zoom.
3. Resources:
Download Data sheet LM317 Voltage Regulator.
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