Designing a variable dual DC power supply that provides voltage in the range of -12 to +12 volts

Abstract

The dual variable power supply was designed in four stages including transformation that is stepping down the 240V from the mains to 12 volts that works well will the components,then rectification in which the ac was now converted to dc using a system of four diodes, then capacitors and voltage regulators were then used to produce a noise free dual power supply,this power supply can be used in lab experiments requiring low but variable voltages and further developments can be done to this supply by connecting a motor system that can be commanded to react on specific orders depending on how voltage varies