I have three 36V DC switching power supplies (2A, 5A and 5A+). I checked them with a multimeter and they all give 36V DC quite precisely but if I switch the multimeter to AC I can measure a fast oscillating voltage between 0 and 38V. Is this normal for a 36V power supply? I measured many switching PSU's in this manner (5V, 9V and 12V DC PSU's) and they never gave more than 0.5V AC and never oscillating. Is there any solution to filter out this variation of voltage? The DC is not oscillating. Should I replace capacitors with higher capacity ones? (the capacitors at the output seem to be rather small)
Two of these PSU's I bought from new and one is used. I am trying to pick up the best one out of these to power up my audio amplifier. I had a careful look inside all of them. One of them is really complex (many electronic parts) and the output is adjustable. I tried all three of them with the amplifier and I get a reasonable amount of buzzing in the speakers when there is no music playing. The buzzing is louder with one of the PSU's. They are made by LiteOn, XPpower and no_name.
Thank you very much for reading this!
Two of these PSU's I bought from new and one is used. I am trying to pick up the best one out of these to power up my audio amplifier. I had a careful look inside all of them. One of them is really complex (many electronic parts) and the output is adjustable. I tried all three of them with the amplifier and I get a reasonable amount of buzzing in the speakers when there is no music playing. The buzzing is louder with one of the PSU's. They are made by LiteOn, XPpower and no_name.
Thank you very much for reading this!