3.3V/5V USB power supply module directly takes the power from the dc and provides an output of 5V and 3.3 V regulated voltage at the same time. In addition, it has a USB socket that fits in 400 and 830 ports of the breadboard. This module is applied to the MB102 breadboard. It provides an input voltage of 6.5v to 12v from the barrel connector. In order to protect the circuit from reverse polarity, a series diode is provided. This module consists of the ON/OFF switches to control the power and an LED to indicate the presence of power. These are the perfect power supply modules for Arduino projects.it can provide output 5v on the USB connector and can also take input through the USB connector. This3.3V/5V MB102 Breadboard compatible Power Supply Module also outputs 5V on the USB connector or input through the USB connector. It’s a must-have product for experimenters who have to test/prototype electronic circuits on the breadboard.