DIY Multimedia LED Projector (video manual)

Step 17 Sound System

 
My sound system came from the computer speaker. If they work at 12v even better as you need to drop down the voltage to 12v for the LCD.

1.- Take it apart.

2.- I modified the circuit so I could use the sound system switch as main switch. see pics

3.- Later I change the LED of the sound circuit for a blue LED, which looks cooler!

Comments

[atselikas]

how do you put speakers on the 3.5" lcd

[aekara]

i have some old pc speakers but the transformer from the speakers said 9v dc. I tried to power them with 12v but they did not work . what can i do?




sorry for my bad english

[scratchr]

If the rating is lower than the power you give it, poof! The speaker will fry.

[aekara]

i have add a voltage refulator that give me 9v dc and i works

[scratchr]

Yes, I use voltage regulators all the time, but I was saying is if you connect the speaker directly to 12v it will fry unless it is protected internally by a regulator.

[aekara]

yes i understand what you say but i add the voltage regulator after i write this comment