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[newbie]Hissling sound at inductor RL-1952

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mingyee

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Hi, I've this power circuit using a LM2576T Switching regulator to have a 13V o/p. I've attached a copy of the schematic. I wonder the inductor I'm using has this hissling sound. At 1st I used RL1955 & then i changed to RL1952. Both also have the hissling sound. Could anyone help me out with this? thank you.
 

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