All buck converters need capacitors on the input. Actually, in a perfect world, if the supply had zero output impedance and infinite current capacity and the tracks had zero resistance or inductance, ...

The electrical voltage, the resistance of a conductor, or the current passing through a wire are quantities that can be easily measured by using a tester. But if you need to know the capacity of a ...

Every now and then you need to make your own capacitor. That includes choosing a dielectric for it, the insulating material that goes between the plates. One dielectric material that I use a lot is ...