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3.5mm AUX to stereo speakers
3.5mm AUX to stereo speakers
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Old 28th September 2020, 05:45 AM   #1
Burner1061 is offline Burner1061
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Join Date: Jul 2020
Location: Livermore CA, USA
Exclamation 3.5mm AUX to stereo speakers

This question is way to complicated for me to try to Google so I thought I'd try here.

I'm making a DIY Bluetooth speaker from woofers, an amp, and a Bluetooth card. The audio goes from my phone to Bluetooth card, to amp then to speakers. However, the only way to connect the bluetooth card to the amp is over 3.5mm AUX, and I'm struggling to figure out how to do this.

On the bletooth card there are 2 positive and negative ports (origionally sdesigned to go straight to speakers, but there going to an amp first now bevase the speakers are bigger.)

So does anyone have any suggestions on how to wire a set of stereo speakers to an AUX port? This AUX port was a solution to another problem someone here solved for me so I think it should be possible. Thank you in advance. (Also the amp will be here tomorrow so I'd like to get started)
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Old 28th September 2020, 03:32 PM   #2
Galu is online now Galu  Scotland
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I'm finding your description of your requirements a bit confusing, but I'll give your post a nudge.

Do you want the output of a bluetooth adaptor to go to a 3.5mm AUX port on an amplifier?

Perhaps a photo of the "2 positive and negative ports" on the bluetooth device would help.

You don't happen to mean two RCA sockets, do you?
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Old 28th September 2020, 06:13 PM   #3
russc is offline russc  England
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Bigger speakers don't necessarily need a bigger amp.
However, post a picture or details of the amp as well.
Please be clearer on the final question - either better description or photos if you can't explain.
Please advise if speakers are 'active' ie integral amp like typical computer speakers or 'passive' like hi-fi speakers made to be driven by an external amplifier.

Sometimes my patience astounds me.
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Old 28th September 2020, 08:37 PM   #4
Burner1061 is offline Burner1061
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Join Date: Jul 2020
Location: Livermore CA, USA
Quote:
Originally Posted by Galu View Post
I'm finding your description of your requirements a bit confusing, but I'll give your post a nudge.

Do you want the output of a bluetooth adaptor to go to a 3.5mm AUX port on an amplifier?

Perhaps a photo of the "2 positive and negative ports" on the bluetooth device would help.

You don't happen to mean two RCA sockets, do you?
Yes sorry for the confusing thread. Yes, the output of a Bluetooth adaptor to go to a 3.5mm AUX port on an amplifier. I don't know how to upload an image on this site it's just 2 ports with red and black wires for left and right speakers that I need to plug into a 3.5mm socket. However, I'm not sure how to convert the output of the bluetooth board to 3.5mm. Hope this makes sense! And no, I don't mean RCA.
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Old 28th September 2020, 08:42 PM   #5
Burner1061 is offline Burner1061
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Join Date: Jul 2020
Location: Livermore CA, USA
Quote:
Originally Posted by russc View Post
Bigger speakers don't necessarily need a bigger amp.
However, post a picture or details of the amp as well.
Please be clearer on the final question - either better description or photos if you can't explain.
Please advise if speakers are 'active' ie integral amp like typical computer speakers or 'passive' like hi-fi speakers made to be driven by an external amplifier.

Sometimes my patience astounds me.
The Bluetooth board outputs 2 2.5 watts. The speakers are each 50 watts. I ordered a cheap x2 20-watt amp but the board outputs in 2 red and black speaker wire ports and the amp inputs in 3.5mm AUX so I need to find a way to convert the L/R red and black output to 3.5mm AUX, hopefully that makes more sense.
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Old 29th September 2020, 12:22 AM   #6
chrisng is offline chrisng  United States
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Join Date: Jul 2015
If your 20-watt amplifier comes with gain/volume control, you can simply connect the Bluetooth board L/R red and black output to 3.5mm AUX input via screw terminal 3.5mm plug.


Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.

Last edited by chrisng; 29th September 2020 at 12:49 AM.
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Old 29th September 2020, 12:37 AM   #7
Burner1061 is offline Burner1061
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Location: Livermore CA, USA
Thank you, but right now I don't know which is L, R, ground in the cable plus there's 3 extra wires. Do I just have to guess or is there a key?
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Old 29th September 2020, 01:13 AM   #8
chrisng is offline chrisng  United States
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We need picture of the 20-watt amplifier and Bluetooth board to go further.
To post pictures, use the "Go Advanced" feature and click on the paper clip icon "Attachments" to upload pictures.
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Old 29th September 2020, 01:44 AM   #9
Burner1061 is offline Burner1061
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Join Date: Jul 2020
Location: Livermore CA, USA
hopefully, this is what you need. (Also there are two speakers)
Attached Images
File Type: jpg speaker1.jpg (91.7 KB, 37 views)
File Type: jpg speaker2.jpg (447.1 KB, 35 views)
File Type: jpg speaker3.jpg (567.4 KB, 10 views)
File Type: jpg speaker4.jpg (243.6 KB, 10 views)
File Type: jpg speaker5.jpg (555.5 KB, 12 views)

Last edited by Burner1061; 29th September 2020 at 01:53 AM.
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Old 29th September 2020, 02:50 AM   #10
Burner1061 is offline Burner1061
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Join Date: Jul 2020
Location: Livermore CA, USA
Quote:
Originally Posted by chrisng View Post
We need picture of the 20-watt amplifier and Bluetooth board to go further.
To post pictures, use the "Go Advanced" feature and click on the paper clip icon "Attachments" to upload pictures.
I think they went through this time. (My phone takes really big pictures so the browser didn't like it)
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