The controls of the White Circuits for the booster synchrotron of Taiwan Light Source (TLS) were developed in the late 1990s. That design is based on various analog circuitry to detect 10 Hz magnet amplitude and phase. The existing implementation consists of analog regulation for amplitude control and digital regulation for the relative phase between magnet families. Recently, modernized White Circuits controls were implemented to prevent component obsolescence in the existing system. The upgraded system adopts digital regulation for both amplitude and phase loops. Improve performance and easy maintenance are the goals of this upgrade.