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Riden RD6006P faint hissing sound
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TechSplendid:
Hello all,

Hope everyone is well.

I received my new Riden RD6006P today and I immediately notice that it makes a faint hissing sound when I turn on the voltage output. As soon as I increase the output voltage, the noise becomes less and above 35 volts, the noise is gone.

Does anyone know if this is normal? Or is this a malfunction of the buck regulator?

Thanks in advance for your help
Martin72:
Hi and welcome,

Did you noticed this without load?
If yes try the same with a "little" load on the output...

TechSplendid:
yes the hissing sound is also with a load connected. The sound is very soft, but I doubt if this is normal. Have not experienced this before. The seller says (of course) that this is normal.
Martin72:
Is this a complete supply (you have only plug it to mains) or do you "feed" it with an extra dc-supply?
If last, which kind of...linear or switched..
What the sound concerns, "normally" it vanished when enough current flows (load on), if not there are several possibilities, beginning with simply design fail, ending with some kind of interaction with the supply.
Did you wath the output with scope?
TechSplendid:
I just tested with a bigger load (1amp). The bigger the load, the less the noise becomes. is this normal?
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