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Class D Switching Power Amplifiers and Power D/A conversion

Amplifier for Bluetooth speaker
Amplifier for Bluetooth speaker
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Old 23rd October 2017, 01:30 AM   #31
horst303 is offline horst303  Australia
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Quote:
Originally Posted by eX Radikal View Post
that one! any bluetooth module that
"allows DIY friends without pressure" has to be it!


however my recommendation: I've been down your route many times, so I have had a lot of the DIY fun, but there comes a time when you just want a compact solution which works so rather then messing with step down transformers and connectors and volume controls and boxes I've settled on this
Nobsound NS-10G Bluetooth 4.0 Mini Digital Amplifier Stereo HiFi Power Amp 50Wx2 | eBay

TPA3118, with built in bluetooth, line-in and soundcard.
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Old 23rd October 2017, 11:30 PM   #32
eX Radikal is offline eX Radikal  Portugal
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You really recomend that BT module or just kidding?

I've already ordered the amplifier alone, so, now I need to buy a standalone BT module too. :S
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Old 23rd October 2017, 11:56 PM   #33
horst303 is offline horst303  Australia
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Quote:
Originally Posted by eX Radikal View Post
You really recomend that BT module or just kidding?

I've already ordered the amplifier alone, so, now I need to buy a standalone BT module too. :S
Impossible to know!



Yeah, standalone amp, standalone bt module, stand alone dc converter, stand alone isolator after you find that the dc converter introduces unacceptable noise, second standalone battery after you find that the isolator isn't making it. Its a process.
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Old 24th October 2017, 01:13 AM   #34
OffGridKindaGuy is offline OffGridKindaGuy  United States
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I've used several of these in portable jam boxes. Full function and the built in speakers are good above ~400hZ. Use the line out to feed your amp. Consider a sub! Both can operate at the same voltage so no need to convert voltages..


Zeepin AV252B Car 1 Din Stereo Radio Audio Player Built in Bluetooth 2.1 EDR Off Preset 18 Stations FM Time Display Autoradio-in Car Radios from Automobiles & Motorcycles on Aliexpress.com | Alibaba Group
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Old 24th October 2017, 01:50 AM   #35
eX Radikal is offline eX Radikal  Portugal
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Quote:
Originally Posted by horst303 View Post
Impossible to know!



Yeah, standalone amp, standalone bt module, stand alone dc converter, stand alone isolator after you find that the dc converter introduces unacceptable noise, second standalone battery after you find that the isolator isn't making it. Its a process.
Yap, that's my objective since I have the speakers, the amp (incoming), a bunch of other things, I will try to do that process. Don't crucify me

Quote:
Originally Posted by OffGridKindaGuy View Post
I've used several of these in portable jam boxes. Full function and the built in speakers are good above ~400hZ. Use the line out to feed your amp. Consider a sub! Both can operate at the same voltage so no need to convert voltages..


Zeepin AV252B Car 1 Din Stereo Radio Audio Player Built in Bluetooth 2.1 EDR Off Preset 18 Stations FM Time Display Autoradio-in Car Radios from Automobiles & Motorcycles on Aliexpress.com | Alibaba Group
Like I was saying, I have the amp (incoming), the speakers, passive radiator, etc.
Missing now is Bluetooth module (and after, the batteries), so I won't buy a full speaker. The fun of it is to DIY the whole thing my way, not buying something done. For that I have a Mi Speaker 2x3w.
Thanks anyway for the suggestion.
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Old 25th October 2017, 09:42 PM   #36
eX Radikal is offline eX Radikal  Portugal
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So, I was thinking to buy this one that already come with the buttons. I think It's not bad, right? Bluetooth 4.0 Audio Receiver Board Wireless Stereo Sound Module For Phone Car S | eBay
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Old 29th October 2017, 02:25 PM   #37
ZipSnipe is offline ZipSnipe  United States
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Looks good Rad, that amp I bought (not received yet) Digital 2.1 Channel Amplifier Board Bluetooth USB Input 50W+50W Stereo 100W im | eBay I sadly just found some Amazon reviews on it, all bad. I am hoping that maybe mine will be lucky. Also, the biggest complaint I have heard about most of these amps is the built in voice that announces power on connection, etc in annoying asian voice according to the complaints. Not that I have anything against Asians(i am married to one) but it would be a nice option to mute that voice.
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Old 29th October 2017, 03:01 PM   #38
eX Radikal is offline eX Radikal  Portugal
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Exactly, maybe this one I'll receive have beeps or something similar and not the voice. I'll try to program it if that's possible, to change the sounds to something more confortable. Fingers crossed
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Old 19th November 2017, 07:49 PM   #39
eX Radikal is offline eX Radikal  Portugal
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Hello,
So, it came the amplifier and I've been testing it. It's absolutely amazing the sound of this thing for 5€ +/-. I've connected it to my 100w speaker with 19v power adapter and the result is awesome without any mod (perhaps needs a little more bass refinement).

Is there any chance to add a LED to know when it's on or not?
Also, to get a little better bass, which capacitors do you recommend to use? These are 4x470uF 50V (original??) Sanyo.

Thanks in advance.
Some pictures here just because

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Click the image to open in full size.
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Old 27th November 2017, 02:29 AM   #40
eX Radikal is offline eX Radikal  Portugal
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Up!
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