Introduction: How to Build ADJUSTABLE VOLTAGE REGULATOR Using LM317 With SHORT CIRCUIT PROTECTION

DIY | How to build ADJUSTABLE VOLTAGE REGULATOR using LM317 with SHORT CIRCUIT PROTECTION

*** Technical Details***

1. You can adjust the Output voltage from 1.5 volt to 35 volt provided the input voltage is greater then output voltage by at least 2 to 3 volt

2. In the circuit the purpose of the Diode is to protect from short circuits.

a) Diode D1 protects from internal short circuits &

b) Diode D2 protects from external short circuits

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***Project Cost***

This project cost me approximately around 3$

Step 1: Things You Need

Picture of Things You Need

***Part List***

1. LM317

2. 5K Trimpot

3. 1N4001 - 2

4. Heat Sink

5. Male Header

6. 330 ohm resistor

7. 10uf/25volt Capacitor

8. 0.1uF Ceramic Capacitor

9. PCB Board

10 Soldering Items

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4. Heat Sink - http://amzn.to/2q3ItZx

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3. 1N4001 - http://amzn.to/2r3bdpH

4. Heat Sink - http://amzn.to/2rCcAIC

5. Male Header - http://amzn.to/2qEIgzp

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Step 2: Circuit Diagram & Finished Images

Picture of Circuit Diagram & Finished Images

The Circuit diagram for the voltage regulator is shown in the first image. Construct the circuit according to the circuit diagram.

Note : Don't Forget to connect an Heat Sink to the IC

To adjust the Output voltage fuse the trimmer pot. The Voltage can be adjusted from 1.5 volt to 35 vol & also note the input voltage should always be greater then the output voltage. In the circuit we have used two Diodes. The purpose of the diode is to protect from short circuits.

a) Diode D1 protects from internal short circuits &

b) Diode D2 protects from external short circuits

To watch the working of this circuit you can watch the video posted in the first step

Comments

rickalvi (author)2017-06-25

Nice instructible. Just to let you know that T.I now considers the LM317 obsolete and soon to be discontinued. In regard to your claim that the LM 317 is short circuit proof, beware. Inadverdantly or otherwise short circuit the out put terminals and you will see how quickly this chip will fail. And the China versions will fail even quicker. The Achilles heel of all these regulators has always been their short circuit failure:LM317,350 and even the 338. They work pretty good until they encounter a short at the output.

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