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"The Wiener" TPA3118 amplifier card
"The Wiener" TPA3118 amplifier card
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Old 5th August 2017, 03:26 AM   #831
paugie is offline paugie  Philippines
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Quote:
Originally Posted by bk856er View Post
For the standard Wiener I had a strong preference for a linear regulated supply over laptop bricks and even audio-grade SMPS. Even a very basic linear regulated supply was better,
So I would say YES try a linear regulated supply!
BK
Thanks much, BK
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Old 13th August 2017, 06:13 AM   #832
anomalous is offline anomalous  Australia
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Default is the Weiner a dead project?

I've been asking every now and then for a bit over a year now - is there going to be another round of Weiners produced. Seems like the answer is looking like a no.

with that in mind, anyone have a weiner pro they'd like to on sell?

cheers

ben
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Old 15th August 2017, 04:52 AM   #833
jorem is offline jorem  United States
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BK was kind enough to offer a spare board which I was able to wire up to my build. I quickly reviewed the switch settings and it looked good, made sure not to tighten screws too much, and it made noise when I hit play, so I put it away for later.

When I got it out again, the speakers started to periodically "get sucked in" for half a second. It would still amplify the source for half a second between each thud. I took it out and tried different settings and found that 1SPW mode would work but not BD mode. After I put everything back together I noticed 1SPW sounded different, like the low end was very attenuated. There was also noticeably more signal noise with no input plugged in. This led me to take it out of the case again to try different settings.

BD mode would produce a periodic fault/speaker thud. The speaker thud was initially a long DC signal as the driver would travel pretty far down and stay down for half a second. I measured it at the time and was getting just over 12VDC, which is the battery voltage it was powered by.

I left it to troubleshoot another day. I unwired all the terminals and took it completely off the case. At this point both 1SPW and BD mode were both producing the periodic fault, but the thud changed to a pop at some point. The start-up delay adjustment directly impacts the length of the period between each fault. The LED turns off at the same time as the pop.

When I read the voltage during the faults now, its about 0.3VDC. If I decrease the start-up delay it will climb to 1.7VDC. I suspect my DMM isn't sampling fast enough to catch the faster spike unless I increase its frequency.

With no inputs connected, a 19V laptop brick, and two speakers attached, I tried pretty much all of the DIP switch settings. Placing the board into standby mode between each change.

Two of the states I tried did produce a slightly different result - the pops we're a split second apart from one another. All other states had both speakers pop at about the same time. This happened in these states:
1SPW 1 Mhz and 26dB pop separated by ~1/4 second
1SPW 1.2 Mhz and 26dB pop separated by ~1/3 second

I'm not sure what to do now, I guess I will take another good long look at it to see if I missed anything I may have damaged. Thank you to BK for helping me get this far.

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Old 17th August 2017, 02:55 AM   #834
bk856er is offline bk856er  United States
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"The Wiener" TPA3118 amplifier card
jorem and I took the troubleshooting as far as my (limited!) knowledge could go.


Ideally gmarsh or another TPA311x guru can suggest informative test points/diagnostics.


I'm hopeful we can identify the fault in jorem's replacement board and repair it. The other lingering question is the root cause of the failure(s). jorem's project is super cool and it'd be great to see it alive again!


BK
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