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DIY Hobby projects, diagram, schematic

Electronic Circuits

DIY Hobby projects, diagram, schematic

LM 317 Power Supply

electronicecircuits, July 28, 2009September 14, 2023
lm-317-regulator-power-supply LM317

LM317 Power Supply Circuit

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 LM317 applications however.

lm 317 regulator IC power supply circuit
LM317 schematic
PARTS LIST
R1220 Ω
R22 KΩ Variable Resistor
C13300 µf 50v
C210 µf 25v
C31 µf 25v
C40.1 µf
D1100V 5A bridge rectifier
D2IN 4007
D3IN 4007
IC1LM 317
T118 VAC 2AMP
F250mA

The values of R1 and R2 are not critical but R1 should not be larger than 270 ohms. For a fixed voltage output R2 should be selected to give the desired maximum output voltage for a given R1 value. See the calculation on the drawing.

lm-317-iclm-317-pinout
LM 317 regulator IC, The LM317 device is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V. It requires only two external resistors to set the output voltage. The device features a typical line regulation of 0.01% and typical load regulation of 0.1%. It includes current limiting, thermal overload protection, and safe operating area protection. Overload protection remains functional even if the ADJUST terminal is disconnected.LM 317 PinOut

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. These conditions will be rare but ten cents worth of protection can save the cost of a new regulator.

lm-317-output-voltage-quation

An Ammeter could be added to the circuit by placing it between the filter capacitor and the input terminal of the regulator.

Also check this post for calculation – lm317 calculator

Please send your ideas, which are very important for our success.

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Comments (11)

  1. Pingback: Simple Ni-Cd Battery Charger | Electronic Circuits
  2. Pingback: LM317 REGULATED BATTERY CHARGER CIRCUIT | Electronic Circuits
  3. Anonymous says:
    April 11, 2010 at 8:02 pm

    I really liked your blog! good

    Reply
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    May 16, 2010 at 6:49 am

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    May 16, 2010 at 7:44 pm

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  7. Techwatch says:
    May 19, 2010 at 6:25 pm

    thanks for the information

    Reply
  8. aristocrat says:
    June 13, 2010 at 4:27 pm

    its good but give some more information

    Reply
  9. p.balu says:
    March 3, 2011 at 4:33 pm

    thankyou sir i am studing forEEE engineering from tamilnadu.i need more circuit sir . so please send me emil.
    basically i am intersting in this field.so i need more information sir.

    Reply
  10. Slunce says:
    August 5, 2013 at 5:53 pm

    I adj is between 100uA and 50uA, right?

    Reply
  11. Pingback: LM317 Calculator - Electronic Software

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