im trying to do this project <a href="https://www.wikihow.com/Transmit-Audio-With-a-Laser-Pen" target="_blank" rel="nofollow noopener noreferrer">9 Ways to Transmit Audio With a Laser Pen - wikiHow</a> but im unsure of the transformer to use....

im trying to do this project <a href="https://www.wikihow.com/Transmit-Audio-With-a-Laser-Pen" target="_blank" rel="nofollow noopener noreferrer">9 Ways to Transmit Audio With a Laser Pen - wikiHow</a> but im unsure of the transformer to use....

hi. do u know how to convert sound signals to enough energy which can be used ti light up an led?