Hello everyone!
Good to have the blog back in operation!
My question has to do with a power supply that I got from aliexpress as a cheap power supply for my 12V RGB LED strip.
The power supply is noisy! When I have the power supply connected to the same breaker circuit like an old Dell monitor and a guitar amplifier weird things happen. (I would assume that in campus accommodation every room has a separate breaker)
My main issue is with the monitor though! When I have the LED strip powered on red, green, or blue the monitor works.
Things get weird when I power more than one of the colors. For example when I mix blue and red to get violet the screen functions at low brightness but the signal gets lost after a certain point.
Another issue is that when I have the power supply connected and powered on (even with no load), I get a pretty significant humming noise out of my guitar amplifier.
Is this just a noise issue? How are issues like that solved in power supplies and what causes them?