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Bluetooth Receiver Input to 3.5mm Jack Output

NIhal Paul

Aug 9, 2016
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Hi,
I've been working on a personal project I need help with this project. My level of understanding of electronics is very basic and only extends to 1 introductory college level course.

What I want to do is build a device that receives input through Bluetooth and gives an output through a 3.5mm jack. I know almost nothing, so I would really appreciate it if you could tell me how to build this circuit.

From what I understand I would need:
  1. a Bluetooth module
  2. a battery
  3. a 3.5mm jack
I'm almost definitely missing something so I would love your help on that too.
 

KJ6EAD

Aug 13, 2011
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What kind of output do you need? The plug coming from the bluetooth receiver is a usually a "line level" audio output intended to feed a line level input on an audio device such as an amplifier.
 

davenn

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Sep 5, 2009
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hi there
welcome to EP :)

I'm almost definitely missing something so I would love your help on that too.

yes lots
1) where is the Bluetooth signal originating from ?
2) BT signals are digital, so on the receive side after the BT module you will have some sort of microprocessor that takes
that digital signal and processes it to do whatever you want to achieve
3) WHAT are you trying to achieve ? ... as in, what is the BT signal and received data going to be used for ?



Dave
 

NIhal Paul

Aug 9, 2016
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What I want to do is to pair my phone to the BT device and send it audio signals. The BT device has to receive the signals from the phone and give an output that can read by a 3.5mm jack connected to some speakers or headphones.
 

davenn

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What I want to do is to pair my phone to the BT device and send it audio signals. The BT device has to receive the signals from the phone and give an output that can read by a 3.5mm jack connected to some speakers or headphones.

OK so does your BT device have all the circuitry to produce an audio signal out ?

if not, then you need to reconsider the comments #2 of my above post
 

KJ6EAD

Aug 13, 2011
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You just need a small audio amplifier to drive the speakers or headphones from the bluetooth module's output. One easy, inexpensive way to achieve both goals is to get a pair of amplified speakers (computer speakers) that have an integral headphone jack. The only other thing you may need is a 3.5mm stereo female-female adapter, sometimes called a gender bender, to connect the bluetooth module to the speakers.
 

NIhal Paul

Aug 9, 2016
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13942468_1215200588490615_1327876399_n.jpg


So, I bought this cheap wireless speaker a while ago and opened it. If I remove the black speaker and fix a female 3.5mm jack, it should work right?
 

davenn

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Sep 5, 2009
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13942468_1215200588490615_1327876399_n.jpg


So, I bought this cheap wireless speaker a while ago and opened it. If I remove the black speaker and fix a female 3.5mm jack, it should work right?

probably, yes

now why the heck didn't you tell us that in post #1 instead of leading people on a time wasting chase ???
 

NIhal Paul

Aug 9, 2016
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I thought it wouldn't be too hard to build one from scratch. I wanted to make a more refined version.
Also because of the small battery, the output on bigger headphones would be much lower correct?
 

davenn

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Sep 5, 2009
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I thought it wouldn't be too hard to build one from scratch. I wanted to make a more refined version.
Also because of the small battery, the output on bigger headphones would be much lower correct?

yes, correct. but you could use the small signal from that unit to feed into a higher power amp if you wanted to :)
 
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