Typically 78xx series regulators have a maximum load current capacity of 1 to 1.5 Amperes. Using this design you can double the maximum current of your 78xx regulator. This design was posted on the Net by I Hakki Cavdar of Karadeniz Technical University, Trabzon, Turkey. I have revised some of the components values due to heating concerns and to suit my intended application. Picture #2 is the schematic diagram.
Step 1: Preparing the Components & Circuit Board
IC1 and IC2 - 78xx series regulator IC ( 7805 for 5V, 7812 for 12V etc.)
D1,D2 & D3- 1N4003 ( 3 Amp Diodes )
D4 & D5 - Light Emitting Diodes (LED)**
R1 & R2 - 4.7 K , 1/2 watt resistor **
C1 & C2 - 4700 uF / 16V electrolytic capacitor
C3 - 47,000 uF / 35V electrolytic capacitor
Printed Circuit Board ( PCB )
** - optional components
Cut the Circuit Board using a hacksaw, click the picture for a better view. Using the waterproof marker, draw this to the copper side of the circuit board- copy the RED diagram. Take note of the pin distances of the components so that placing them afterwards will be a breeze. Put the PCB in the Etching solution and wait until you'll see the copperless plate ( around 20 minutes ). Rinse the PCB with water. Clean the Marker Ink with Acetone to expose the copper. Drill the holes for the components and your PCB is ready to go.