Equalizers are electronic devices used to balance frequency components of electronic signals. Equalizers used in electrical systems, such as battery equalizers, maintain balanced loads to prevent overcurrent and potential damage to the system.
Equalizers are frequently used in analog and digital communications to render frequency response flat from transmission to reception; this ensures faithful and accurate reception of the original signal. Modern digital subscriber lines (DSL) also use equalization to counter attenuation distortion when sharing wires with analog local lines.
A battery equalizer (right) beside a DC-DC converter for comparison.
Image credit: Wesgarde