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Class D Switching Power Amplifiers and Power D/A conversion

TDA8954TH - XH-M252 board - anyone?
TDA8954TH - XH-M252 board - anyone?
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Old 20th January 2019, 10:45 PM   #31
tacoman5000 is offline tacoman5000
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Yes, that's what i'm trying to do

The preamp is something like this:

Amazon.com: Nobsound High Precision Passive Preamp Volume Controller VOL Control HiFi Preamplifier ALPS (RCA&HiFi Version, Black): Home Audio & Theater

I want to be able to connect the audio input of the amplifier board to the rca out of this kind of passive preamp but I don't know what to do with the ground..

EDIT: It should probably be advertised as a 'passive volume controller' since it doesn't really amplify the signal.

Last edited by tacoman5000; 20th January 2019 at 10:52 PM.
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Old 21st January 2019, 01:13 PM   #32
dzwer is offline dzwer  Bulgaria
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Passive volume controller - that's right!
Here is your case for stereo:
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File Type: png TDA_passive_preamp_transformer.png (266.3 KB, 57 views)
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Old 22nd January 2019, 02:54 AM   #33
tacoman5000 is offline tacoman5000
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Quote:
Originally Posted by dzwer View Post
Passive volume controller - that's right!
Here is your case for stereo:
Great, thanks for that! I will try this later when I can and report back on the results. Cheers.
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Old 26th January 2019, 10:35 AM   #34
tacoman5000 is offline tacoman5000
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I finally got around to hooking the amp up and everything worked well

I can't really use it with my main speakers running on active crossovers yet (Fountek NeoCD3.5H + Vifa NE180W) but I tested it on my pair of Usher S-520s and they sounded good! Full and impactful, in contrast to how these speakers have a tendency to sound bright and thin with some hardness in the upper midrange with some equipment. I did not get this sound with this amp at all.

There is a slight hum on both channels that is audible when you put your ear really close to the drivers, but inaudible even less than a meter away. The heatsink gets rather warm in 24V operation but even a very slight breeze from a distant fan is adequate to keep it manageable.

Other than these, everything's good. I look forward to getting this setup fitted in a proper case.

Last edited by tacoman5000; 26th January 2019 at 10:45 AM.
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