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Old 3rd April 2009, 09:47 PM   #1
Arnop is offline Arnop  Germany
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Default Best possible sound quality from +12 ATX PSU


i need a lil amp for my second computer.

Therews no need for the best High End stuff. But I want a decent sound.
As I anderstand it, the amp should have no sound at all. Lowest possible distortion.

I want to use the +12 line. I dont want to spend money on Toroids.


-What is the best 12 Car Radio IC?
For asymetric supply! Is there anything better than TDA 2050?
I prefer mono ICs.

-Do you suppose to use any kind of filter or simply some Elco on the V+ pin? Some Pcs tend to have noises from the HDD on the psu lines.

-What kind of cutput elco whould you prefer, since this seems to be very important here. I whould use panasonic FC and some film capacitor parallel.
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Old 3rd April 2009, 09:52 PM   #2
star882 is offline star882  United States
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Use an isolated DC/DC converter to avoid ground loops and boost the voltage.
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
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Old 4th April 2009, 07:33 PM   #3
Arnop is offline Arnop  Germany
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Use an isolated DC/DC converter to avoid ground loops and boost the voltage.
I dont like that. I don't need much power and i don't want to make it more complex as it has to be.

Ground loops are an argument. But first i want to try if i wont work without the converter.
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Old 6th April 2009, 11:40 AM   #4
sasmit is offline sasmit  India
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I had tried that once using a TA 7230 but there was hell lot of noise coming from the SMPS...I had tried to put the amp inside the pc case and put a few speaker terminals at back to connect the speakers...but soon realised this was not a good idea..may be was too inexperienced back then..but tapping PSU +12 is gonna be a noisy affair neverthless. If you don't need too much power a small toroid is not gonna cost that much. You could also look at using a large wall adaptor some of them go upto 3 Amps, which will give decent power. You'll need additional decoupling on your amp board though.
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