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How can you connect new BT 4.2 WTS audio receiver module with TPA3118 mono noiseless
How can you connect new BT 4.2 WTS audio receiver module with TPA3118 mono noiseless
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Old 11th July 2018, 09:16 AM   #1
oxl is offline oxl  Denmark
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Default How can you connect new BT 4.2 WTS audio receiver module with TPA3118 mono noiseless

I want to connect this new BT 4.2 TWS audio receiver module:

Bluetooth Audio Receiver Board(TWS/Apt-X)

with the Sanwu TPA3118 mono amplifier module:

http://sorbits.dk/classd/IMG_20160806_173342.jpg

I would like the BT module to draw power from the same 15-19v powersupply as the amplifier module (possible using a simple 5v voltage regulator)

However it is my experience that annoying noise will travel between the amplifier and the BT module via the power line or audio line or common ground.

How can I avoid/limit this ?

Last edited by oxl; 11th July 2018 at 10:23 AM.
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Old 11th July 2018, 04:57 PM   #2
Nenola is offline Nenola  Finland
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An isolated DC-DC converter is your best choice, just choose a one with required input/output specs.

But I have to warn you, the gain in those Sanwu boards is way too high, so it may be noisy. But it can be fixed with simply removing one resistor. Here's some good reading about those boards:

Cheap TPA3118D2 boards, modding them and everything that comes with it
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Old 11th July 2018, 05:12 PM   #3
Khron is offline Khron  Finland
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I don't see why a 7805 wouldn't work, it's spec'd up to 35V input.

Althoughm to keep out some of the HF hash on the supply rail, i'd also add a series inductor "upstream" of the 7805 (because linear regulators have decreasing performance, the higher you go in frequency).

Grounding stuff, though, might be more interesting to hunt down indeed. Although i'd say moving and/or disconnecting the audio ground connection between the BT board and the amp may well be the easier and/or cheaper solution, rather than "fancy" isolated DC/DC stuff But that's just me, i'm a cheapskate
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Old 11th July 2018, 06:13 PM   #4
oxl is offline oxl  Denmark
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Will make the R27 gain mod
Two powersupplies is not a solution

" add a series inductor "upstream" of the 7805 " - please detail
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Old 11th July 2018, 06:24 PM   #5
Khron is offline Khron  Finland
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Low-pass filter - Wikipedia

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Old 11th July 2018, 07:02 PM   #6
doctormord is offline doctormord  Germany
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Would you mind to post in the correct forums section rather than Class-D?


You started:
How can you connect new BT 4.2 WTS audio receiver module with TPA3118 mono noiseless
BT 4.2 amplifier boards with WTS and Apt-X
Changing the chinese voice of TPA3110 Sanwu Bluetooth Amplifier Board SW-HF47
How can you stream bluetooth audio to multiple bluetooth audio amplifiers ?


All relates more or less to "digital source" and are for the same topic. I'd suggest to make a comprehensive writeup of your project/problem and have one post for it rather than 4+.


This would make it easier to answer and follow.
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Old 11th July 2018, 07:34 PM   #7
Mooly is offline Mooly  United Kingdom
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How can you connect new BT 4.2 WTS audio receiver module with TPA3118 mono noiseless


Thread moved.

oxl, doctormord's advice is good. Try and set your project and goals out as a single thread rather than having many random questions, which tbh gets very messy.
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Old 11th July 2018, 10:33 PM   #8
oxl is offline oxl  Denmark
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Got it. Thanks
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Old 12th July 2018, 02:04 AM   #9
IVX is offline IVX  Ukraine
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Is that noise "white" hiss or kind of animated, irregular one? CSR BT DACs what I tried were in the range from awful to poor regarding hiss noise(ok for BT speaker toys), the radical way to improve S/N, in that case, is using I2S output BT modules.
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Old 12th July 2018, 07:04 AM   #10
oxl is offline oxl  Denmark
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Noise is pulsating, low
OK, but how would you connect I2S to the TPA3118 mono amplifier ?
Are there any I2S BT modules with TWS (True Wireless Stereo) ?
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