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Need help for home made speaker

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vascobrissos14

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Jul 14, 2015
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Hello everyone,

I was thinking on making a home made speaker since I'm using my dad's JBL Flip for a long time alredy and it's not mine 😛

I got all the parts I need (I think) so I'm here to ask if the parts I chose are going to work or not.
The case is going to be hand made :)
I chose the speaker to be Bluetooth and Line In with a battery pack.
I was thinking in placing the 4 batterys in series (14.8v) and use that Step Down module to get 5V and connect my bluetooth drive and solder 2 more cables for the sound amplifier.
Thank you all for your help

LIST:

http://www.ebay.com/itm/USB-Bluetooth-Music-Audio-Stereo-Receiver-for-Car-AUX-IN-Home-Speaker-3-5mm-/141868434353?hash=item21080483b1:g:cogAAOxyNo9SynA3
http://www.ebay.com/itm/4x-3-7V-18650-GTL-Li-ion-5300mAh-Red-Rechargeable-Battery-for-LED-Torch-/121498553553?hash=item1c49e0ccd1:g:7swAAOSwaNBUdsdT
http://www.ebay.com/itm/DC-to-DC-Converter-Step-Down-Module-7V-9V-12V-24V-to-5V-Usb-Output-Power-Adapter-/131549251070?hash=item1ea0f245fe:g:ywUAAOSwPcVVll1Z
http://www.ebay.com/itm/Mini-Digital-Class-D-Stereo-Audio-Amplifier-Board-2-Channel-5W-5W-AMP-Board-2-8-/311511826382?hash=item48878d3fce:g:B2gAAOSw3KFWfRqE
http://www.ebay.com/itm/2pcs-2-inch-45mm-4Ohm-4-5W-Speaker-Loudspeaker-Strong-bass-/161833148763?hash=item25ae01e15b:g:TDYAAOSw9r1V~7-x

EDIT: Can anyone tell me what that "Speaker" hole on the amplifier does? I'm a bit confused with it. ty
 
Solution
Kursun
I would have preferred to use an amplifier that works with 12V so that it can be powered directly from the battery and not over-tax the 5V step-down converter.

I hope the input sensitivity of the amplifier is suitable to the analog output of the bluetooth adapter. You have to try and see...

Is it going to be a good speaker? I haven't used JBL Flip...
Well, it has 2" speakers. If you want anything better you may try a 2.1 speaker system. But that complicates the project.
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You seem to have sorted everything quite very well.

It is not a speaker hole. It is just a hole (total of 3 actually) for mounting screw.
The speaker and power supply terminal pins are beside it.
 
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So youre saying I can order everything like it is from ebay and mount it on a pcb and a case? No need to extra parts or changes on the choosen ones?

Btw, is it going to be a good speaker? Like the JBL Flip?
Thank you for replying :)

 
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I would have preferred to use an amplifier that works with 12V so that it can be powered directly from the battery and not over-tax the 5V step-down converter.

I hope the input sensitivity of the amplifier is suitable to the analog output of the bluetooth adapter. You have to try and see...

Is it going to be a good speaker? I haven't used JBL Flip...
Well, it has 2" speakers. If you want anything better you may try a 2.1 speaker system. But that complicates the project.
 
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Solution


My JBL Flip works with 12V, that's probably why it's 100€ compared to my project (20-30€).
My teacher has a JBL Flip 2 and it uses a 5V charger, so I think my project is alright. Just a question, putting the batterys in series to get 14,8v asks for a 19V (just a guess) charger or does a 5V charger work? Since they are 3.7V each.
A 12V amplifier is a bit expensive and more complicated so I think the 5V one is fine.
I could do a 2.1 system but I don't really need it since the speakers I chose are advertised with "Good bass" or something like that.
The bluetooth pen should work, watch this video. https://www.youtube.com/watch?v=j5Kk-pCFRqs

Thank you for replying :)

 
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When connected series to produce 14.8V can not charge it with 5V of course. You could if they were all wired parallel (3.7V).

In the video a 5V adapter is used. And he advices using a power bank. That's a good idea, using a power bank instead of using four 3.7V batteries in series. That would take care of charging too. And you won't be needing the 5V step-down module. But you will be needing a 5V/2A usb charger
 
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So, I found a step UP converter that does 3V/3.3V/3.7V/4.2V to 5V which I can connect my 3.7V batterys to and get 5V.
The BT pen would connect on the usb port and I would add extra wires to connect on the AMP board. http://www.ebay.com/itm/DC-DC-3V-3-3V-3-7V-4-2V-to-5V-USB-2A-Step-Up-Power-Module-Precise-Vehicle-Charge-/131459619329?hash=item1e9b9a9a01:g:zZwAAOSwPhdVCSUk

Would this work well, produce less heat and would I be able to use a 5V wall charger to charge the speaker?
 
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Yes that's it. You can do it. You don't even have to use a power bank.
I am not sure of using 4 3.7V batteries in parallel though...
Each cell is 5300 mAh. That's 5.3 Ah. Paralleling 4 together 5.3Ahx4 = 21.2 Ah.

Your amplifier is class d, so it should be quite efficient. Especially during idle and low power it should consume very little.
You may get by using less than 4 batteries unless you want the charge to last quite a long time.
 
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The step up converter you have found has about 1.5A typical / 2A max capacity.
It would be better ifyou find one with ~3A capacity to be on the safe side.
 
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Honestly, we all know those batterys aren't 5300mah, theyre chinese xD. They are probabkly 2000 or 3000mah so I think 4 is good for 3-6 hours of audio :)

Thank you for all your help until now, I hope the speaker turns out a good speaker :)

 
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I don't understand the need for 2 amplifier boards and 4 channels, 4 5W speakers... For more power?

Adding a 3.5mm headphone jack for aux is a good idea for direct cable hook ups. But you don't necessarily need a second set of amps and speakers. What you would need in that case is an input switch to select bluetooth or aux.
 
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Thank you for your help! That switch is a good idea indeed :)

 
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You can select a 3-position switch if you want...
A- On and bluetooth in
Center- Off
B- On and aux in...
This switch can also be your on/off switch. It should have enough poles to switch input and battery.
 
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Could you please send me an ebay link for the switch you are talking about? I don't really know how that works. Thank you :)
 
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3 position switch dpdt on-off-on:
http://www.ebay.com/itm/1X-6-Pin-DPDT-ON-OFF-ON-3-Position-Snap-Boat-Rocker-Switch-6A-250V-10A-125V-AC/360862333651?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D34864%26meid%3Dca35b67f97d34ecb9c1ff3a6095bd325%26pid%3D100005%26rk%3D4%26rkt%3D6%26sd%3D181816527509
(one set of 3 terminals for input selection, the other 3 for battery on/off)

If you decide on a single input selector switch (spdt)
1. http://www.ebay.com/itm/5pcs-NEW-Mini-MTS-103-3-Pin-SPDT-ON-OFF-ON-6A-125VAC-Toggle-Switches-/281853796055?hash=item419fcb9ed7:g:cFgAAOSw9N1Vkkr3
2. http://www.ebay.com/itm/NEW-20pcs-5V-0-3A-Black-Mini-Size-SPDT-Slide-Switch-On-Off-3-Pin-PCB-for-DIY-/131425000522?hash=item1e998a5c4a:g:yTkAAOSwZjJU2G4d

I'm sure you can find better examples.
BTW,
dpdt: double pole/double throw
spdt: single pole/double throw
 
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