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BUY GS-R405S https://www.utsource.net/itm/p/1571206.html
20W TO 140W STEP-DOWN SWITCHING REGULATOR FAMILY
GS-R405S is a module manufactured by G-Sonic. It is a 4-channel stereo audio amplifier module with a power output of 4x25W. It is designed for use in car audio systems and other audio applications. Features: 4-channel stereo audio amplifier 4x25W power output Low distortion and low noise Overload and short circuit protection Thermal protection High efficiency Low power consumption Easy to install Applications: Car audio systems Home audio systems Portable audio systems Professional audio systems Multimedia systems (For reference only)