Quote:
Originally Posted by
danielghofrani /img/forum/go_quote.gif
[size=medium] also, I dont know what you mean by transformers making audible noise. I agree that they create a substantial hum out of your headphone (line out) jack but there is no Acoustic noise coming out from them, ( I actually never had a fanless power supply to listen to it in quiet though)[/size]
What he means is in the cheaper iron core transformers. The layered plates of the core will vibrate making an audible noise [due to the adhesive keeping them together and a whole bunch of electromagnet physics]. [Solid iron core transformers don't have this problem]. You usually won't hear it over the fans or often noisy cheap capacitors. Occasionally you can hear it more if you put the case on a surface it can resonate on like a hardwood floor. The noise you hear via your headphone jack is a combination of the noise from the switched mode power supply (the switching the power on and off to regulate voltage will cause noise in electrical output), poor AC filtering in the power supply, poor DC output filtering, the noise from the CPU, other EMI from the motherboard, and if it's a laptop it's often because of grounding issues on most power supplies (<_< cheater plugs are nice >_>).
P.S. Get a good quality low noise [electrical] power supply. If you can find one (probably not) get a linear computer power supply [I don't even know if they make one but it would be better for audio].
P.P.S. SSD drives are a good way to eliminate the hard drive noise in the case. Some traditional hard drives are quieter then others but if you go with a more expensive [in comparison to a traditional drive] SSD drive you can have completely silent drive.