Tripath TA2024 vs TA2020 noise - diyAudio
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Old 26th June 2015, 10:20 PM   #1
roburg is offline roburg  Brazil
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Default Tripath TA2024 vs TA2020 noise

Hi All,
I've been playing around with tripath ta2024 & ta2020s for a cheapo headphone amplifier with lots of headroom (for fun, not as a journey through audiophile mayonaise)
I had an old 2024 board at home and was a little surprised at the level of hiss when driving headphones with no input (input shorted). I bought a ta2020 board thinking this is going to be better (also power on/off thud suppression is nice icing) and the ta2020 is noticeably more noisy than the ta2024 with the same PSU (50hz transformer based, not switch-mode) & with no input. So much so, once the output is cooled down on the TA2020 a bit with a resistor divider the noise is very noticeable & distracting in a fairly noisy office. The TA2024 with less output division is much less noisy, in fact i cant hear it unless i go to a quiet room & plug leads in & out to make sure the faint hiss isn't not my imagination, this is still with enough gain to make sub-bass unpleasantly loud.
The TA2020 board is the exact same board as one on the right on wikipedia here (https://en.wikipedia.org/wiki/Class-...er_modules.jpg) and looks fairly well constructed, OK components etc....
the ta2024 board is pictured here https://www.youtube.com/watch?featur...R-hM9MIsk#t=28 and is optimally cheaply put together.

has anyone else noticed this with these tripaths? Or do the ta2020's usually get plugged into really low sensitivity speakers that maybe mask a lot of the noise? Maybe i can swap a few components on the ta2020 board to reduce maximum gain & reduce noise?

Cheers,
Rob.
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Old 27th June 2015, 06:27 PM   #2
Bare is offline Bare  Canada
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YJ boardd ta2020 is OK. Reliable at least.
But sound is Not that of a genuine Ta 2020 Chip amp.
The ALL fake parts.. remember??
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Old 27th June 2015, 10:55 PM   #3
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Class D is digital = on or off. There is no noise!
Noise is supplied to the amp or is processed along the way. A class D amplifier cannot, unless faulty, produce noise.
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Old 27th June 2015, 11:35 PM   #4
wwenze is offline wwenze  Singapore
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1) Speaker amps having 80-90dB SNR relative to 1 volt is normal. Ear/headphones that operate at lower voltages will see a lot of noise. Speakers have sensitivity of typically 80-90dB @ 2.83V @ 1m so this level of noise is not audible.
2) Class-D amps require a load of 8ohm or 4ohm or something (depends on the filter design) for the filter to work properly to remove the switching noise.
3) How are you connecting a bridged amp like the Tripath to a headphone which shares the ground pin for both channels? If you are using only one of the bridge pair of each channel and connecting the ground pin to the ground of the Tripath power supply, you will get lots of common mode noise. Plus a 6V DC at the output.

Speaker amps and headphone amps are designed differently, if you want a headphone amplifier with lots of headroom you build a headphone amplifier with lots of headroom instead of using a speaker amp. Here is a picture of what happens to a speaker amp when driving a low or open load versus what is supposed to happen.

Click the image to open in full size.
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