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Class D Switching Power Amplifiers and Power D/A conversion

Wondom/Sure AB32155 hiss
Wondom/Sure AB32155 hiss
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Old 24th September 2018, 05:47 AM   #1
rabbitz is offline rabbitz  Australia
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Default Wondom/Sure AB32155 hiss

The AA-AB32155V00 I bought has considerable hiss that can easily be heard 1m away. Sure-Electronics kindly sent a second module that that was no better even though they said it would be tested prior to despatch.
Sure Electronics' webstore 2 x 15 Watt 4 Ohm Class D Audio Amplifier Board - TA2024

I've used several TA2024 modules and amps before such as Sonic Impact, Dayton DTA-1 and Dayton DTA-2 which were very quiet. I've also got a TPA3116D2 (black blue module) which is very quiet as well.

Have other users of this module noticed this hiss and is there anything that can be done prior to the signal input or or after the speaker output that could help. I've tried different power supplies, leads, speakers, sources with no change in hiss. I don't want to play with the module as my eyes and hands are not up to it.

Thanks
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Old 24th September 2018, 06:19 AM   #2
FauxFrench is offline FauxFrench  France
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I have another TA2024 module and it is silent. TPA3116 is known to have hiss if the source impedance is too high.

If you remove the source and short-circuit the two input lines to ground through 1KOhm and you still have hiss, I believe it is inherent in the board design and you cannot do much without having to modify the board.
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Old 25th September 2018, 08:30 AM   #3
rabbitz is offline rabbitz  Australia
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Thanks. I'll try that this week end.
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Old 29th September 2018, 06:56 AM   #4
rabbitz is offline rabbitz  Australia
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Tried the 1K resistors to ground and hiss is still the same. Binned the modules.
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