It looks like a capacitor, but from my testing it is probably a resistor.

This is the board I removed it from.

What is this

It is marked VW-1 HF(OR T)

One side board

Second side board


1 Answer 1


It's a tapped inductor (autotransformer), used as part of a switchmode power converter. Inside, it has a ferrite core shaped like a bobbin with some wire wrapped around it, and then the whole thing was covered with heat-shrink tubing.

  • \$\begingroup\$ WOW that was fast. Thanks.I am getting 0.6Ω L=0.03mH 1 (long)-2 pins, 2.1Ω L=0.62mH 1(long)-3pins and 2.6Ω L=0.91mH 2-3 pins, Is this right? How can i say if this is faulty? \$\endgroup\$ Nov 2, 2019 at 11:56
  • \$\begingroup\$ That sounds about right for a part that size. \$\endgroup\$
    – Dave Tweed
    Nov 2, 2019 at 11:57
  • \$\begingroup\$ How can i say if this is faulty? \$\endgroup\$ Nov 2, 2019 at 11:59
  • \$\begingroup\$ Based on your measurements, it doesn't sound like it is. What is the application? Based on the fact that two of the external wires are connected directly to the coil, I'm guessing a high-frequency lamp driver of some sort. \$\endgroup\$
    – Dave Tweed
    Nov 2, 2019 at 12:01
  • \$\begingroup\$ There is a module that creates mist out of water, but doesnt get any voltage and this coil is just before that module. \$\endgroup\$ Nov 2, 2019 at 12:05

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