I hear the same thing on mine, it is normal and lasts for like 15 seconds after screen turns off. Don’t worry I actually contacted them after thinking it was a defect. Their manuals also let you know about the noise.
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If you have a Cuboid, put your ear against the base and it does the same thing, the only difference is it is louder on the Evic series mods.
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ive been a smok and wismec guy lately and prior was the kanger kbox every one of them lol but ive been tryi g some different things and this mod has had great praise so for the price i hopped on it and now im in love with it so im happy this is normal
i’m not a expert but capacitors and transforming hum , aren’t there capacitors on boards ?