Quote:
Originally Posted by redwire
The part is a ferrite-core inductor used for a differential-mode filter, roughly around 1-5mH. Purpose is to lessen the EMI and RFI noise from the SMPS primary that radiates out to mains. You could read the colour codes for its value.
Cheapest chinese smps and wall-warts don't even have the inductor, they leave it out.
Typically you would see a common-mode choke there but this wall adapter is low power 1.8W output and just a single inductor is used instead.
The part must have got hit/broken somehow.
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Thanks. I didn’t know coils have the inductance value color-coded.
Based on lines it’s 1mH.
Can I replace it in this power supply with a coil of 1500uH, 100mA, 25Ω?