I have a small wall power supply (in some countries they are called wall warts) that seems to be giving off a audible hum. I think it is 100Hz hum and is easily audible upto a meter away with my very good hearing.
I attempted to google this but all I got was results for amplifiers. The hum I hear is a noise I can hear is from the power supply itself. I intend to use it to power a pc fan. The power supply gives off the same hum regardless of whether current in being drawn or not. It is one of those voltage adjustable ones that has the option of 12v, 9v, 7.5v, 6v, 4.5v, 3v or 1.5v output. Judging by its size and weight it is a linear power supply, I can't say more without smashing it apart.
I am just wondering what the cause of the hum is, this is more about my curiosity as I am going through a power supply phase in electronics. I have checked and none of my other power supplies produce this noise.
Thank you
I attempted to google this but all I got was results for amplifiers. The hum I hear is a noise I can hear is from the power supply itself. I intend to use it to power a pc fan. The power supply gives off the same hum regardless of whether current in being drawn or not. It is one of those voltage adjustable ones that has the option of 12v, 9v, 7.5v, 6v, 4.5v, 3v or 1.5v output. Judging by its size and weight it is a linear power supply, I can't say more without smashing it apart.
I am just wondering what the cause of the hum is, this is more about my curiosity as I am going through a power supply phase in electronics. I have checked and none of my other power supplies produce this noise.
Thank you