Exploding TA2022 Tripath Chips!!! - Page 2 - diyAudio
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Old 7th December 2007, 12:37 PM   #11
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I've built three AMP1-B boards and haven't had any problems with the chips exploding. I had them running on a switching power supply with no problems. I did manage to kill two chips from a reverse voltage spike on the 5v supply; it was a stupid mistake.

I don't have any experience with the AMP10, but there must be either something peculiar about the board or a problem with your setup.
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Old 7th December 2007, 12:42 PM   #12
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I'll take some top quality shots of my board/setup when I get home later, see if anyone can spot an obvious mistake.

Thanks for all the help!
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Old 8th December 2007, 02:32 PM   #13
john65b is offline john65b  United States
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My previous post was pertaining to a TA2020 chip, not the TA2022.

But it did explode the way you mention - a loud pop and chunk of plastic flies off the lower front of the chip.
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Old 8th December 2007, 03:31 PM   #14
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What kind of transformer do you use?

Is it a 33V AC or 24V AC (will be around 33V DC achter de on-board power supply).
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Old 8th December 2007, 05:05 PM   #15
gootee is offline gootee  United States
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This might be an unlikely cause. But it sounds like everything else is unlikely, too. Those chips are said to be very prone to damage from static electricity. So maybe they are being damaged before installation (or because of the grounding?), in such a way that they become more likely to fail as you have decribed.

Another approach: As a first test, you might want to try running with +/-30V supplies, for a while, since it sounds like some limit is being exceeded. If they don't explode, that way, maybe it will provide a way to get a better clue about the cause.

Also, if someone who is familiar with this chip and the circuit would read the datasheet very carefully, and note all of the critical voltage and current limits, and the critical circuit-layout notes and suggestions, it might be possible to see where in the 41Hz circuit there could exist the possibilities for generating over-voltage or over-current spikes, etc. For example, too much loop inductance, or maybe even just inductance in components/leads (I noticed that they recommend surface-mount, for a reason), could cause voltage spikes for quickly-changing currents. Another example: Ground plane near a sensitive input could give too much stray capacitance, possibly causing current spikes for rapidly-changing voltages. I am not familiar with this design and those are just basic theoretical scenarios, off the top of my head. Someone would have to check the actual details of the device and the circuit, to know what might be worth worrying about, or worth checking further.
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Old 8th December 2007, 06:29 PM   #16
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I forgot to note mine are powered by regulated +/-34v supplies so ~34v is definitely no problem for this chip.
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Old 9th December 2007, 04:28 PM   #17
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Just to clarify, I'm using a 24v toroidal transformer, giving 33.6v rail voltages.

R41,R52,R37,R31 (feedback resistors) are all 10K, as per the build instructions for 27-35v rails.

I'm using the standard inductors that came with the kit.

Someone made a heatsink comment, I am using a nice meaty heatsink, that gets luke warm at most, so that's not the fault. It's also not connected to anything

I am also pretty sure that I haven't caused any ESD component damage, I'd have to be pretty unlucky to damage 6 ICs and 2 boards.

...as promised I will post some pictures in the next day or so.

Thanks.
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Old 10th December 2007, 09:27 AM   #18
Corax is offline Corax  Germany
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Hi folks,

I've read some rumors (somewhere) about the Tripath chips (once in a while) blowing up when you connect/disconnect the input terminal when the Tripath amp is already powered up. If this would be the case the reason might be the introduction of a more or less excessive spike entering the input stage caused by a different DC-level from the connected source. The chance would be that the input can not recover from such a "saturation" fast enough before the power stage blows up.
I own an AMP-2, four AMP-3s (for an octal channel test amplifier powered by SMPS) and finally an AMP-5 from Jans 41hz-page but have never experienced myself such a behaviour till now - maybe it's because I never (dis)connent the inputs of the Tripath chips while the amp is running. After all I don't know (and I won't try it out) if the Tripath chips are prone to this phenomena. As I said - just rumors. So figure out yourself if this might be true or not. I also went through the data sheets but found no hint or something similar dealing with this phenomena.
Nevertheless any further experience from other DIYer concerning this might be extremely interesting.

With greeting from Germany
Corax
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Old 10th December 2007, 10:26 AM   #19
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I am starting to think that running the AMP 10B with the high gain feedback setting is the problem.

I've just installed a new chip and gone back to the "general use" feedback resistor settings (I think they are all 22k, but I may be wrong). Everything seems sweet, but it still makes me cringe every time a loud section of music comes on!

Certainly the TA2022 example circuit from the datasheet suggests feedback settings very similar to the "general use" settings in the AMP10B instructions. The high gain option in the AMP10B instructions seem to be pushing things a bit with regard to the onboard inductor etc and if anything out of the ordinary happens from the inputs the output FETs expire with a loud pop and a puff of noxious smoke .


When using the high gain resistor settings in the past, the chip would often go into mute state, something that I haven't yet managed with the general use resistor option. I'm just going to settle for a slightly quieter output, cross my finger and hope for the best!

Despite all my problems getting this board going, I have to say that I have never heard anything that comes close to a 4 X TDA1543 DAC and AMP 10B TA2022 in terms of clarity/expression. It just sounds immediately and obviously more punchy and "better" than any consumer grade setups that I have come across (I've heard a lot). A Micromega Stage 5 / Quad 444 / Quad 405 stack sounds lifeless and boring in comparision.

My next little project is to try a non-NOS DAC and see how that compares, probably a PCM1798.

Thanks for all the help.
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Old 10th December 2007, 08:29 PM   #20
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My Tripath 105A based amp is DEAD, but when it was working it couldnīt compete with the very good linear amps I own.

Iīm a bit curious about the PCM 1794 DAC on this page;

http://www.audiodiylab.com/modules/news/

A non-NOS DAC is most likely an up sampling DAC.
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