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
- Jumper wires
- LM7812 12V fixed regulator in a TO-220 case
- 0.22 micro farad capacitor
- 0.1 micro farad capacitor
Orient the breadboard so that the length of the board runs left to right.
Position the LM7812 so that the tab is behind the chip package. Plug it into the breadboard.
Use a jumper wire to connect the leftmost (ground) pin of the 7812 to the ground strip, located at the bottom of the breadboard.
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
Connect one lead of the 0.22 micro farad capacitor to the input of the 7812. Connect the other lead to the ground strip.
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.
Use a long wire to connect the negative terminal of the power supply to the ground strip of the breadboard.
Use a long wire to connect the positive terminal of the power supply to the positive strip.
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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