Voltage regulator board. This board uses a 7805 regulator in order to supply 5V and up to 1A to any circuit mounted on a breadboard.

Components list:
C1 – 10µF 25V electrolytic capacitor;
C2 – 100nF 63V polyester capacitor;
D1 – 1N5400 rectifier diode;
D2 – 1N4001 rectifier diode;
D3 – Red LED;
D4 – 1N4150 fast switching diode;
HS1 – 4,8°C/W passive heatsink;
IC1 – 7805 voltage regulator (LM7805/µA7805);
J1 – 5,5mm x 2,1mm DC jack;
J2/3 – 2 pins male header connector;
R1 – 180Ω±5% 1/8W carbon resistor.

Project page (in Portuguese): http://www.bloguetronica.com/2014/07/circuito-regulador-de-tensao-crt5v.html