I built a multichannel surround amp with 3 UcD400ADs (front - L C R) and 2 UcD180ADs (rear L R). One of the UcD400ADs is failing. It generates a repeating thumping sound with any speaker load. It is currently connected to my center channel.
These modules were purchased way back in 2005, so are way out of warranty and are no longer supported by Hypex.
Does anyone know what component could be failing and causing this repeated thumping?
These modules were purchased way back in 2005, so are way out of warranty and are no longer supported by Hypex.
Does anyone know what component could be failing and causing this repeated thumping?
No experience with those modules but have you tried to debug the problem with the faulty module running alone on the power supply ?
No, I haven't tried disconnecting the other two modules from the power supply, yet. Why would that help to identify the problem?
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Honestly just a common sense way of isolating the problem, just maybe the power supply is suffering from abusive inrush current loads, input offset who knows... running it bare bones without any possible interfering loads.. what type of power supply are you using?? would help alot if you gave a more detailed description what your configuration looks like so someone here can possibly help you.
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I won't be able to take it apart for awhile since it is our only way to get audio for our home theater, which is currently run in stereo mode. So I am trying to figure out what I can without taking everything apart.
The power supply is a linear supply. I have a 1KVA toroid connected to a Hypex Power Supply HG, which feeds all three of the UcD400ADs.
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Not sure if this helps, but... this system has been working fine for the past 7 years. If there's a problem with my Hypex Power Supply HG wouldn't the other amp modules also have problems?
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Once I have a fairly good idea of what needs to be done I'll be happy to start working on it.
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First step is to have only the suspect module connected to the power supply as noted above. It may have become sensitive to noise generated by the other amps or the power supply. If its fine connect one of the other amps, then the other etc etc - its a deductive process. From then on its down to the electronics in the item that is causing the problem.
Other than that its just guessing.....😀
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