The GSK-4 is an easy-to-assemble basic power supply kit that is based upon the 7805 voltage regulator. The finished kit will yield a fixed 5 V supply at 1 A as well as a variable supply. The variable supply output is dependent upon the input voltage. The GSK-4 is perfect for learning basic power supply operation. This kit may be assembled without soldering on any Global Specialties trainer or Proto-Board® (not included), or by soldering to the included PCB. Parts and assembly instructions included.