I have this lamp which runs off of a 12V DC power supply provided. There's a faint ticking sound coming from the power supply, sort of like the sound and volume of a watch tick, but it's happening around 5-6 times per second. What part of the power supply would cause this audible effect? Is it some kind of switching relay for AC rectification? If it helps, this happens whether it's on or off.
Please note I'm not looking for advice on how to dampen the sound, I'm just curious.