A circuit that converts AC power into DC power and the output voltage constant. The voltage output by the number of IC Regulators Series 78XX, which can receive input voltage up to 35V and current of 1 amp, the circuit has been designed with a LED display function. circuit When the output voltage to the transistor can be used to expand the number MJ 2955 has increased by approximately 5 A can be connected in parallel to increase the flow to another. In the selection of IC Regulators consider it from the table.