Hello everyone,
I was thinking of integrating a small 2x20W @8Ohm class D amplifier in my PC, which I think it's small and loud enough for my needs.
However, most of the amplifier boards that I could find need a 15V minimum power supply, recommended for most is 19V and some other are 24V; current requirements (in full load, at maximum volume) is somewhere around 3A to 4A.
At first I thought I could just buy a 19V 4A power suply, and simply power it from the 220V mains, but then, I realized that the amount of space in the build that I'm making is way more limited to fit such power supply.
So, why not using a DC-DC boost converter? It's fairly small; it can be powered from PC's 12V output, and the output power is within the recommended amplifier requirements.
But I am no electronics specialist, and a few things read on the internet in some occasions, prevent me from taking this solution for granted.
I usually read about not powering amplifier boards with PC's power supply because the audio amplification is a non-constant load, which causes fast varying current draws from the PC power supply, and it may not be healthy for it. Wouldn't this be applicable to usual class A/B amplifiers?
I also read that DC-DC converters can introduce (other than high frequency audible noise) voltage noise in the PC power supply. Isn't this limited (to a certain degree) to the DC-DC converter quality? Can I build small filter that would prevent this from happening, or just reduce it enough to be careless about it?
Can you confirm the above?
Are there other issues that I should worry about?
I have also found an amplifier board that uses the MAX98400A and can be powered directly from a 12V power source (8V-28V power supply range). Would this be a better solution?
I was thinking of integrating a small 2x20W @8Ohm class D amplifier in my PC, which I think it's small and loud enough for my needs.
However, most of the amplifier boards that I could find need a 15V minimum power supply, recommended for most is 19V and some other are 24V; current requirements (in full load, at maximum volume) is somewhere around 3A to 4A.
At first I thought I could just buy a 19V 4A power suply, and simply power it from the 220V mains, but then, I realized that the amount of space in the build that I'm making is way more limited to fit such power supply.
So, why not using a DC-DC boost converter? It's fairly small; it can be powered from PC's 12V output, and the output power is within the recommended amplifier requirements.
But I am no electronics specialist, and a few things read on the internet in some occasions, prevent me from taking this solution for granted.
I usually read about not powering amplifier boards with PC's power supply because the audio amplification is a non-constant load, which causes fast varying current draws from the PC power supply, and it may not be healthy for it. Wouldn't this be applicable to usual class A/B amplifiers?
I also read that DC-DC converters can introduce (other than high frequency audible noise) voltage noise in the PC power supply. Isn't this limited (to a certain degree) to the DC-DC converter quality? Can I build small filter that would prevent this from happening, or just reduce it enough to be careless about it?
Can you confirm the above?
Are there other issues that I should worry about?
I have also found an amplifier board that uses the MAX98400A and can be powered directly from a 12V power source (8V-28V power supply range). Would this be a better solution?