This is a simple but powerful power supply , which can deliver up. 5 AThe circuit works with the aid of a normal voltage regulator of the type 78xx and a buffer transistor. When the output current exceeds 200 mA, then T1 takes over, allowing the maximum output current is 5 amperes. The 78 series regulator is available from 5 to 24 volts. In the place of the xx is the voltage, so 7812 for a 12 volt regulator.Take the AC in 5% higher than the desired output voltage. In that case it is below the wrinkle.T1 is a MJ (E) 2955. It must be properly cooled at higher output currents. 5 A stabilized Power Supply Circuit Diagram Parts List R1 = 3.3 Ω 5 Watt C1 = V 4700μF/63 C2 = V 10μF/35 C3 = 100nF D1 = 35A T1 = MJ2955 (TO220), MJE2955 (TO3), TIP2955 (TO247) IC1 = 78xx F1 = 5A