Hello world,
I was looking for help with my particular situation when I stumbled across this sweet little community.
Anyways my situation:
I have
-A crummy little bluetooth speaker
-A nice speaker with 3.5mm input
And I want to be able to take the signal from the BT audio and convert it to a 3.5mm jack. I've already pulled it off with some success. So far I have:
-Disassembled the BT speaker, severed the wire from the board to the speaker
-Discovered the obvious: Red and Green wires going to the speaker
-Bought a 3.5mm stereo jack (They didn't have any Mono)
-Attached the green wire to ground, and the red to L & R inputs
I've come back with a signal successfully transmitted (A little fuzzy but I can deal with it), but my real dilemma is when no sound is being transmitted. When I stop playing music, or in between songs, a loud buzzing noise happens that doesn't stop. I just guessed with the inputs so obviously something's wrong. I'm just starting to teach myself about audio signals and all that whatnot, so I don't know what exactly the red and green do, or anything.
I was looking for help with my particular situation when I stumbled across this sweet little community.
Anyways my situation:
I have
-A crummy little bluetooth speaker
-A nice speaker with 3.5mm input
And I want to be able to take the signal from the BT audio and convert it to a 3.5mm jack. I've already pulled it off with some success. So far I have:
-Disassembled the BT speaker, severed the wire from the board to the speaker
-Discovered the obvious: Red and Green wires going to the speaker
-Bought a 3.5mm stereo jack (They didn't have any Mono)
-Attached the green wire to ground, and the red to L & R inputs
I've come back with a signal successfully transmitted (A little fuzzy but I can deal with it), but my real dilemma is when no sound is being transmitted. When I stop playing music, or in between songs, a loud buzzing noise happens that doesn't stop. I just guessed with the inputs so obviously something's wrong. I'm just starting to teach myself about audio signals and all that whatnot, so I don't know what exactly the red and green do, or anything.
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If the red and green wires went to the speaker, then they are the speaker wires. However, this does not necessarily mean that you can ground one of them and take output from the other one. Even if you can, you have a 50% chance of grounding the wrong one.
If the BT speaker used a Class D output then extending the wires may create interference if there was no output filter - often omitted on cheap equipment.
If the BT speaker used a Class D output then extending the wires may create interference if there was no output filter - often omitted on cheap equipment.
By the fact that sound is going through, then I grounded it properly. You're right, my speaker doesn't have a sound filter because it didn't need one. Is it possible to make one? I looked into it a bit but I don't understand enough to know that I'm looking at the right thing. A good link would go a long way🙂
Not necessarily. It could use differential drive, so neither connection should be grounded. Wrong wiring might still let some sound through, but distorted or doing damage to the circuit.
Your best bet is to find the name/number of the output chip and Google it. Get a datasheet for it, then you will know what you are dealing with.
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