5V Linear Power Supply

This is a simple 5V DC output power supply using a transformer and a linear voltage regulator. The full-wave bridge is used to increase ripple reduction to capacitor C1, while this capacitor garantees a much more stable voltage to the linear regulator. The use of a heatsink attached to the linear regulator should be considered if there's a high voltage drop across it or if a higher output current is needed. This circuit is pretty simple and easy to build and is very useful when dealing with digital electronics, for instance, to power your microcontroller.

T1 - 230/8V 1A Transformer

D1, D2, D3, D4 - 1N4004 Diode

C1 - 470uF 25V Electrolytic Capacitor

U1 - LM7805 Linear Voltage Regulator

C2 - 10uF 16V Electrolytic Capacitor

C3 - 100nF 16V Mylar Capacitor

Source: National Semiconductor Application Note 556