Chromecast Audio plus Class D amp, how to power them? - diyAudio
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Old 11th January 2016, 12:00 AM   #1
Jerms is offline Jerms  United Kingdom
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Default Chromecast Audio plus Class D amp, how to power them?

...Going into a small box in the Kitchen to hang on the wall. Ideally, I want one power cord entering the box rather than relying on a trailing socket, laptop PSU, USB power supply and wirey mess.

I need two DC voltages, 15-16V for a TPA3116 and 5V for the CC-Audio.

Assuming I'm buying PSUs off eBay etc, what's the better way?

a) One 15V SMPS for the TPA3116 and add a DC-DC buck to provide 5V for the CC-A.

or

b) One 15V SMPS for the TPA and another SMPS giving 5V for the CC-A?


Space in the box is not an issue. It should form a centre panel in between two wall hanging speakers. Only real restriction is the height of 2" or 50mm.

Cheers,

J.
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Old 11th January 2016, 03:01 AM   #2
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The TPA3116 datasheet says that the source voltage can be as low as 4.4V. Couldnt you use 5V power then for that as well as with CC ?
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Old 11th January 2016, 03:40 AM   #3
DUG is offline DUG  Canada
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Option A

12-24V supply and a V7805-1000 for 5V 1A @ 88-93 % efficiency.

V7805-1000 CUI Inc. | Power Supplies - Board Mount | DigiKey

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Old 11th January 2016, 03:55 AM   #4
Jerms is offline Jerms  United Kingdom
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Quote:
Originally Posted by dearchap View Post
The TPA3116 datasheet says that the source voltage can be as low as 4.4V. Couldnt you use 5V power then for that as well as with CC ?
It wouldn't make the required power. I make it under 2 watts into 8 ohms at 5V.
So a common 5V supply seems to be out...

J.
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Old 11th January 2016, 04:02 AM   #5
Jerms is offline Jerms  United Kingdom
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Quote:
Originally Posted by DUG View Post
Option A

12-24V supply and a V7805-1000 for 5V 1A @ 88-93 % efficiency.

V7805-1000 CUI Inc. | Power Supplies - Board Mount | DigiKey

I have a LM2596 buck. I guess that might do it.
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Old 15th February 2016, 01:54 AM   #6
Jerms is offline Jerms  United Kingdom
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I have finally got around to trying out my setup with the buck powering the Chromecast Audio. I'm getting noise though. Seems related to Chromecast and phone comms. Any suggestions?.... Other than bin the buck and run the Chromecast Audio mains adapter alongside the SMPS?

Click the image to open in full size.

Last edited by Jerms; 15th February 2016 at 01:57 AM.
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Old 16th February 2016, 01:55 AM   #7
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Try with different powering options the aim is to identify if a particular supply is the problem. It could even be the class D.
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Old 16th February 2016, 04:23 AM   #8
Jerms is offline Jerms  United Kingdom
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Quote:
Originally Posted by trobbins View Post
Try with different powering options the aim is to identify if a particular supply is the problem. It could even be the class D.
It's definitely related to the buck... Read that as the buck plus the feed and rather hacked USB lead. On the supplied Chromedcast audio adapter, the config is essentially silent.

I've tried grounding the shielding of the USB to different points but that made no difference.

A couple of suggestions I've had so far are to twist the supply leads and to ground not just the USB shielding but the cropped data wires that are currently floating.

J.
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Old 16th February 2016, 04:29 AM   #9
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7805 ?
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Old 16th February 2016, 03:43 PM   #10
Jerms is offline Jerms  United Kingdom
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Originally Posted by trobbins View Post
7805 ?
Given the low power req, it does seem an option....
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