Anyone knows what this black unit is? I probably blew up my extension power board when I plugged in a large load on it this week.
I think it’s a fuse(?). It does have a spring-loaded black button on it. No idea what it does though. Continuity is there across those terminals. I couldn’t find a spare unit in the local electrical shops.
Trying figure out how to fix the extension board. It’s either that black unit or one of the wires melted in the cable coming to it.
Most of you would have seen these thick cylindrical parts embedded in USB/Power/HDMI cables around your home, right next to the ports. These are ferrite cores. Basically made of a ferrite material and consists of 2 halves clamping together around a cable. It forms an inductor and is used to suppress high-frequency noise in a cable. You will mostly find it in good-quality branded cables. This becomes important in consumer electronic cables to prevent radiated emissions, to and from the devices it connects.
There are snap-on cores of different dimensions(Hence different impedance to the high-frequency signals). These become very useful for EMI engineers to suppress cable noise and pass the electronic certification. You try on different snap-on cores(sometimes looping the cable inside the core a couple of times) and whichever helps you pass the test goes in the final product(Just the ferrite core part gets embedded in the cable). Saves you a ton of time(and money) while testing in the EMI test labs.