I had a trash keyboard that was unfixable, so I took it apart. Inside, it had two woofers and two tweeters that have a excellent sound quality, so I wanted to use them.
PartsSpeaker
The speaker that I use is a 8W 8Ω. Really, any speaker would work that is either 4Ω or 8Ω.
Transistor
I am using a NPN Darlington transistor, but any NPN transistor would work; the larger, the better.
Capacitor
I use a 2.2uF capacitor, but you can experiment with different values to hear the differences in the noise from the speaker.
Resistor
I use a 220Ω resistor. You can also change this value like the capacitor.
Audio Jack
I soldered my own audio jack breadboard module on prototype board, but you can also buy them.
DC Jack
The DC jack in the schematic is really just for showing where the power connects. You can use any method of connecting the power.
ConnectionsThe schematic is quite simple, and creates a pretty good sound quality. The sound quality could be a lot better if I bought different parts, but I decided to use what I have to make something. The power supply that I use is just a 3.7V 1200mah battery, some people use 9V batteries; anything in that range should be fine, depending on your transistor.
Here's my setup:
Thats all! You can change the value of the capacitor and resistor to test out what works better for you. If you like it, thumbs up! You can also check out my website if you have any questions (you can personally email me here) here.
Check out my other tutorials:
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