I have tried several input caps on my red 2.0 board ( without potmeter and 20V mean well smps ). This didn't give the improvement i was hoping for. I have ordered the sure tpa3110 board, because it should be the same chip, with a different outputfilter. The board arrived two days ago and it really does sound better. I am quite happy with the sound now. The high notes of a piano do sound like a piano. Does anyone know what the outputfilter of the sure tpa3110 board is? Can the same filter be used on the 3116 board? On the board itself i cannot find the beads that are in the documentation of the sure boards.
It's a ferrite bead filter. I can't see them on the published pictures of the board even though they are in the schematic but they might be on the back side. They are tiny (3.2 × 1.6 mm) SMD parts marked L1-L4.
Yes, the same type of filter can, and should, be used on the tpa3116/8 as well. I have long argued that it provides the best audio quality.
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The data sheet describes it as "filter-free".
Attachments
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Not the Sure schematic.
http://www.sure-electronics.net/download/AA-AB32231V100_SCH.pdf
The beads might be under the output terminals but seems strange.
100-150 Ohm @ 100 MHz
As low DCR as possible. Preferably lower than 10mOhm.
Current rating should be at least 1.414 times the maximum current for the lead, so 5A for 21V supply voltage and 4 ohm speakers (minimum impedance of 3 ohm)
I do not see an opamp on the green board from audiobah. Is that analog input class d design? If so, it probably sound better than digital tpa3116 amps. Anyone can compare the green boards sound with breeeze audio amps sound? Breeze audio can be my next purchase but i think I would like to use bigger heatsink and would like to fix that heatsink something more reliable than adhesive. On green board heatsink seems more than enough for the chip imo but it is not in case.
input is analog, modulated inside the amplifier, modulation frequency is produced by the circuit including opamp if i know correctly. In this case input is analog but input to the chip on the board? Is it analog too?
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Still does not make it digital. Common mistake though. At no point is there any analog to digital conversion. The input is an analog signal which is converted to an analog PDM or PWM signal on the output.
The time domain modulation that is required for class D amps takes places inside the output chip. If it's a class D amp, it has to have this modulation otherwise it is not class D.
I think you're also confused about how distortion occurs in general.
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