SMPS Adapters for CCTV and LED have the feature that while a linear regulator maintains the desired output voltage by dissipating excess power in a pass power transistor, rapidly switches a power transistor between saturation and cut off with a variable duty cycle whose average is the desired output voltage. The SMPS Adapters are capable of providing efficient performance. The SMPS Adapters for CCTV and LED can be availed in various specifications.