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Bug using Music Maker w/3W amp, PID: 1788
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Bug using Music Maker w/3W amp, PID: 1788

by davidsalomon on Sat Jul 02, 2016 5:30 pm

Dear friends,

We'll appreciate your help in here. It turns out that our last purchase of 10 units Music Maker w/3W amp, PID: 1788 came with a bug, described below (details of the order below):

- When we turn on the unit, it produces a "hiss" sound never experimented before in previous orders.
This happens constantly in two units, and it happens intermittently in the rest.

Test Conditions:
- Power supply: 3.7V Li-ion 10,000 mah, full charged
- 3" speaker 1W 8 ohm
- 8Gb uSD
- +12dB connected (MusicMaker PCB)

We made several test with the units, changed battery, wires, speaker, uSD and even place, but it still reproduces the "hiss" sound.
One way in which we decreased such noise was connecting the other +6bD connection on PCB; however, the way the hiss sound is decreased is even stranger, since even by a single touch of such connection (+6dB) makes it work, as shown in the video (youtube link: https://youtu.be/38i45GFvEWo)

The failure is only on the 3W Amp zone, since we made the test using earphones and it worked just fine.

The thing is that we need the +12dB connection in order to increase gain. We optionally use the +6dB (single), yet the sound is not enough for our purpose. The way we make it work with noise decreased is by connecting both, +6dB and +12dB.

In our previous purchases of these units we have the +12dB only and never had this problem before.

We have a couple of hypothesis about it:

1- The 3W Amp IC may not have pull-ups activated
2 - Some capacitors are not of the correct value

As a result, we have seconds thoughts of using this 10 units with this bug, we prefer to get new ones and well tested instead. The thing is that the project is for a foreing country and our client really don't want to send the project with bugs. If you give us the credit of the product in our account we are ready to make the new purchase of an order of 250+ as distributors.

We appreciate your comprehension and expect repositions of these units asap, so far we are happy to working with you and we are looking forward to continue working with you.

Thanks in advance,

Sincerely,
David

ORDER ID: 1137807-3114317393
ORDER DATE AND TIME: June 22, 2016 @ 2:01 PM
PID of the preduct with ISSUE: 1788
Attachments
Music1.jpg
Music1.jpg (125.5 KiB) Viewed 312 times

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Re: Bug using Music Maker w/3W amp, PID: 1788

by adafruit2 on Sun Jul 03, 2016 7:00 pm

the original amplifier chip that was used with this shield TPA2012 has been discontinued, and cannot be purchased anymore. we replaced it with the TS2012 which has similar specs but is not identical. It may be noisier - we've never noticed it but that is the only change that has occured. there is no option or replacement that will be identical to the TPA2012.
you may need to normalize your audio to be louder to account for a higher noise floor on this amp or find another solution.

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Re: Bug using Music Maker w/3W amp, PID: 1788

by davidsalomon on Mon Jul 04, 2016 12:23 pm

Hello Adafruit, thank you for your response.

The issue is not the chip, we have already made purchases with this "new" TS2012 chip, and have never had any trouble whatsoever. Actually, when we introduced the Adafruit Music Maker Shield to our shop (http://www.techmake.com/00254.html) we added the TS2012 Datasheet as well.
The 10 units we last bought came with this issue we just described. Clearly this was a bad batch, therefore, as your distributor I kindly request a refund or replacement as soon as possible to continue giving good service with Adafruit products to our clients.

Waiting for your response.

Best regards,
TechMake Electronics ®

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Re: Bug using Music Maker w/3W amp, PID: 1788

by adafruit2 on Mon Jul 04, 2016 12:39 pm

hiya we can refund them - email support@adafruit

however - since we do not know what this 'bug' is and you're the only customer to mention it - there is no guarantee of a fix or replacement
if you return then we can investigate what is different

you should find another board that you can use for your project and do not purchase any more of these. there is no ETA on when there might be a fix or replacement!

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Re: Bug using Music Maker w/3W amp, PID: 1788

by davidsalomon on Wed Jul 06, 2016 11:26 am

Hello Adafruit,

Since we started having in stock the Music Maker, us and our clients loved it. We wouldn't like just not to purchase it anymore.

What we noticed is that the boards with the TS2012 chip that have the ST Microelectronics logo work fine, but those without the logo have the issues we told you about. We had 2 in stock from a previous purchase, those were ST, while the 10 most recent were not. We did the tests and indeed, all the boards with the unbranded chip are the defective ones.

We would like to purchase at least 8 boards but we would like you to make sure you give us the boards with the ST on-board. The refund is in process, but we would like to re-purchase while making sure you give us the boards with the ST brand.

Waiting for your response, best regards.

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Re: Bug using Music Maker w/3W amp, PID: 1788

by adafruit2 on Wed Jul 06, 2016 1:08 pm

OK - please take clear photos showing both chip versions, just the chip, showing the markings

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Re: Bug using Music Maker w/3W amp, PID: 1788

by davidsalomon on Thu Jul 07, 2016 7:16 pm

Hello, here we attach 3 different photos as requested. One of the on board ST chip, and two in which we can clearly see they used another type (the 10 we recently purchased have this chip on board and are the ones with the bug).
Attachments
MusicMaker-WITHOUT_STchip2.jpg
Board without ST Microelectronics chip - does not work fine
MusicMaker-WITHOUT_STchip2.jpg (56.69 KiB) Viewed 204 times
MusicMaker_WithST_chip.jpg
Board with the TS2012 chip ST Microelectronics - works fine
MusicMaker_WithST_chip.jpg (38.58 KiB) Viewed 204 times
MusicMaker-WITHOUT_STchip.jpg
Board without ST Microelectronics chip - does not work fine
MusicMaker-WITHOUT_STchip.jpg (27.09 KiB) Viewed 204 times

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Re: Bug using Music Maker w/3W amp, PID: 1788

by adafruit2 on Thu Jul 07, 2016 7:22 pm

yes thats the TI amp
it is the only amplifier we have
there is no way to get the ST amp anymore, its been discontinued

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Re: Bug using Music Maker w/3W amp, PID: 1788

by davidsalomon on Fri Jul 08, 2016 12:47 pm

Could you provide me the TI's datasheet? We are having trouble finding it, even in its website.

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Re: Bug using Music Maker w/3W amp, PID: 1788

by adafruit2 on Fri Jul 08, 2016 12:49 pm


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Please be positive and constructive with your questions and comments.