1. LM 317 IC

2. LM 317 IC

3. LM 317 Power supply
The output is adjustable between 1.25 and 13.5 Volts with a maximum current limit of 1.5 Amps.
The LM317K regulator is internally protected from current and thermal overloads.
A heat sink will be required for most applications however.

4. LM 317 Power supply

5. LM 317 Power supply parts list
220 Ω R2
2 KΩ Variable Resistor C1
3300 µf 50v C2
10 µf 25v C3
1 µf 25v C4
0.1 µf D1
100V 5A bridge rectifier D2
IN 4007 D3
IC1
LM 317 T1
18 VAC 2AMP F
250mA

6. LM 317 Regulator Pin out

7. LM 317 Power supply
The diodes D2 and D3 in the circuit prevent damage to the regulator during certain adverse conditions such as the output voltage being higher than the input voltage to the regulator or the capacitor across R2 from discharging through the adjustment terminal of the regulator.

8. LM 317 Power supply Output voltage

9. LM 317 IC Front view

10. DC power supply using LM-317 IC circuit diagram

11. LM 317 IC calculator

12. LM 317 Voltage Regulator calculator
This Voltage Regulator Calculator will work for most voltage regulators with a reference voltage (VREF) of 1.25.
For the LM338 and LM350 regulators, 120 ohms is typically used for R1.
However, other values such as 150 or 220 ohms can also be used for R1.

13. LM 317 Voltage Regulator calculator

14. LM 317 Current Regulator calculator
This Current Regulator Calculator will work for adjustable regulators with a reference voltage (VREF) of 1.25.
To determine the output current from the regulator, enter a value for the program resistor (R1) in ohms and press the "Calculate" button.
This will calculate the Output Current in Amperes and the amount of Power Dissipated across R1 in Watts.

15. LM 317 Current Regulator calculator

16. The End
…… Thank You …….