How to wire a 12-v voltage regulator

Written by phil lamass
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How to wire a 12-v voltage regulator
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A voltage regulator converts an unregulated (irregular) input voltage to a regulated (constant) output voltage. The device maintains the regulated voltage up to a specified maximum current load. Wiring an LM7812 fixed 12-volt voltage regulator can be a challenging project, but with the right tools and a little know-how, you should be able to finish the job.

Skill level:
Moderately Challenging

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Things you need

  • 15V power supply
  • Breadboard
  • Jumper wires
  • LM7812 12V fixed regulator in a TO-220 case
  • 0.22 micro farad capacitor
  • 0.1 micro farad capacitor

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Instructions

  1. 1

    Orient the breadboard so that the length of the board runs left to right.

  2. 2

    Position the LM7812 so that the tab is behind the chip package. Plug it into the breadboard.

  3. 3

    Use a jumper wire to connect the leftmost (ground) pin of the 7812 to the ground strip, located at the bottom of the breadboard.

  4. 4

    Use a jumper wire to connect the right-most (input) pin of the LM7812 to the single row of holes (positive strip) at the top of the board

  5. 5

    Connect one lead of the 0.22 micro farad capacitor to the input of the 7812. Connect the other lead to the ground strip.

  6. 6

    Connect one lead of the 0.1 micro farad capacitor to the centre (output) pin of the 7812. Connect the other lead of the capacitor to the ground strip.

  7. 7

    Use a long wire to connect the negative terminal of the power supply to the ground strip of the breadboard.

  8. 8

    Use a long wire to connect the positive terminal of the power supply to the positive strip.

  9. 9

    Connect the positive probe of the volt meter to the output pin of the LM7812 and connect the negative probe to ground. Note that the volt meter indicates 12 volts.

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