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Old 12th June 2014, 02:18 AM   #1
jwhisl is offline jwhisl  United States
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Join Date: Apr 2012
Location: Florida
Default Some advice please

Hello all! I am getting ready to start a portable blue tooth speaker project. I already have some small speakers and ive been looking at this Online Shop Stereo Bluetooth audio receiver / receiver board / receiver module / audio speaker amplifier dedicated DIY|Aliexpress Mobile because I like the idea of having buttons instead of knobs. Does anyone have experience with this product? I'm also looking for passive radiators, preferably rectangular around 2x3" size if anyone can help there. Thanks.
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Old 12th June 2014, 04:47 AM   #2
jwhisl is offline jwhisl  United States
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Join Date: Apr 2012
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Here's a few pictures of the speakers I'm thinking of using. They were in a soundbar mounted to a 32" flat screen. I don't remember the brand but they sound pretty good. Each of the 4 woofers are rated at 5w 8ohm and the tweeters are 10w 4ohm. The only thing is have no idea about frequency response because I don't know the brand.

Click the image to open in full size.

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Last edited by jwhisl; 12th June 2014 at 04:54 AM.
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Old 12th June 2014, 07:48 PM   #3
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Meeeh, I don't think that this is the best speaker to use... For amplifier, use the mini usb PAM class d from ebay, together with the cheap ebay power bank.
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Old 12th June 2014, 07:48 PM   #4
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Default Some advice please

Also, these cheap BT recievers don't sound very well!!!

Last edited by riko4628; 12th June 2014 at 07:49 PM. Reason: *s
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Old 13th June 2014, 04:33 AM   #5
jwhisl is offline jwhisl  United States
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Join Date: Apr 2012
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Yes I agree the speakers in the picture probably won't be used now. I tested them with a small 6 watt amplifier and they were distorting a bit. I could use them as highs but I would still need designated woofers. I think I found a 5.25" peerless passive radiator that I like but I still need to decide on main speakers. What bluetooth module do you recommend that would be somewhat easy to wire to a small amplifier? I'm looking to run about 10-15 wpc (rms)
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Old 15th June 2014, 03:00 PM   #6
jwhisl is offline jwhisl  United States
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Join Date: Apr 2012
Location: Florida
Ok new question: what kind of potentiometer should I use? I think I need an audio taper potentiometer but I dont know if I need a 250k or what. Any advice?
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Old 16th June 2014, 12:19 PM   #7
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Default Some advice please

10-50k should be fine.. I use 50K log. pots in my amps, they work just fine..


15WPC is too much.. 2x3W is enough for big room with efficient speakers..

Last edited by riko4628; 16th June 2014 at 12:22 PM. Reason: wpc
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Old 18th June 2014, 01:25 AM   #8
bknabe is offline bknabe  United States
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Default Bluetooth amp

I have 3 of these for sale on ebay currently
TDA7377 2 x 20W Stereo Amplifier with Built in Bluetooth | eBay
I use one to power a pair of foam core board speakers i have in my garage! These have a 50k audio taper pot I believe.
Bob
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Old 18th June 2014, 01:33 PM   #9
jfresh is offline jfresh  Australia
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I've been using XS3868 Bluetooth module for my portable mini speaker project aka (Pocket Horn) & PAM8803 as the amp, using 3.7v Li-Ion Battery & in-build usb charger.

The Bluetooth module cost around $5.
Here's the Pic, hope this help.

Click the image to open in full size.Click the image to open in full size.
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Old 18th June 2014, 02:54 PM   #10
bknabe is offline bknabe  United States
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Jfresh:
Looks really cool. How do you connect the BT module and the amp to a single battery and avoid a ground loop issue?
Regards,
Bob
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