Test & measurement
Non-polarized electrolytic capacitors have foils with surfaces roughened by a unique etching process, enlarging the surface. This enables it to have a much higher capacitance than other more straightforward types. The electroly Show more
Non-polarized electrolytic capacitors have foils with surfaces roughened by a unique etching process, enlarging the surface. This enables it to have a much higher capacitance than other more straightforward types. The electrolytic capacitors offered by SoundImports are all non-polarised and are available with values from 1 to 4700 uF. The non-polarized electrolytic capacitors offered by SoundImports handle high working voltage from up to 100V. They are useful in places where a high ripple current is needed, such as power supplies. As the capacity of capacitors is proportional to their surface, this process provides the smallest and cheapest type of capacitors. However, this process also weakens the sound quality comparing to non-etched versions. Overall, an electrolytic capacitor is a good type of capacitor. They are perfect for using it in a crossover and ideal for a low-budget project! However, if you are looking for higher quality, feel free to check out our film/foil capacitors!
Tantalum capacitors are the most common type of electrolytic capacitor. Others are classified according to the dielectric paste or the type of gas used. Aluminium electrolytic and polypyrene are common. In any case, the capacitance of an electrolytic capacitor could only be matched by a much larger non-electrolytic capacitor (such as paper or mica capacitors). Therefore, their size is considered one of the main advantages.
Electrolytic capacitors need more care than other capacitors due to their construction and polarity-sensitive operation. Electrolytic capacitors built incorrectly (reverse polarised) will not achieve the correct capacitance and can create internal gas pressure, resulting in a (minor) explosion. Electrolytic capacitors are often more sensitive to temperature than other capacitor types. Therefore, their sensitivity is considered one of their main disadvantages.
Electrolytic capacitors, like most typical capacitors, store electric energy statically by charging isolation in an electric field between two electrodes in the dielectric oxide layer. The cathode, which serves as the capacitor's second electrode, comprises a non-solid or solid electrolyte.
In most electrical circuits, capacitors are almost unavoidable, and their number varies from project to project. A capacitor is an electrical component where the electrical charge can be saved on one side (+), while the opposite charge can be saved on the other side at the same time (-). In audio applications, they are primarily used in crossover filters, where the combination of other components determines the filter action. However, if you want to learn more about capacitors, please check out our detailed blog, "The basics of crossover components"! The blog also explains what you have to look for when choosing a capacitor!
The main distinction between an electrolytic capacitor and a film/foil capacitor can be traced back to the type and construction of the dielectric used. Although the active component of electrolytic capacitors comprises aluminium (anode and cathode foil), paper, and electrolyte, the film/foil capacitor is constructed of metal-coated plastic film that forms the electrodes. Active electrolytic aluminium capacitors have an energy density up to ten times greater than polypropylene film capacitors. The non-polarized electrolytic capacitors here at SoundImports are the best low-cost solutions for passive speaker crossovers!