3.3V/5V power supply circuit board is compact and designed to provide stable and regulated DC power for MB102 breadboard-based electronics projects. The input voltage range of +6.5V to +15V DC is supplied through a barrel jack or USB connector. The module features dual selectable voltage rails (3.3V or 5V) on both the left and right outputs via jumper settings, allowing flexible powering options for different components with up to 800mA of continuous current. It includes onboard AMS1117-3.3 and AMS1117-5.0 voltage regulator chips for stable voltage conversion, an ON/OFF switch, and a power-on indicator LED. The USB 2.0 output port supplies a convenient +5V source for USB-powered devices.
Specification
The quick technical specification of the circuit board is given below.
| Module Type | Power Supply |
| Chip Used | AMS1117-3.3, AMS1117-5.0 |
| Input Type | DC |
| Input Voltage Range | 6.5V to 15V |
| Power Button | DPDT Push Switch |
| Power-ON Indicator | Green Light |
| Input Terminal | 2 |
| Output Type | Fixed DC |
| Output Voltage | 3.3V /5V |
| Output Terminal | 6 |
| Output Current | 800mA Max. |
| PCB Colour | Black |
Circuit Diagram
Schematic of 3.3V/5V mb102 breadboard power supply module circuit as shown below.
The components are used in the circuit boards are - U1: AMS1117-3.3 IC, U2: AMS1117-5.0 IC, J1: Female Barrel Jack, SW1: DPDT Push Switch, D1: SMD 1N4007 Diode, C1 C3 C4: 100nF Ceramic Capacitor, C2: 47uF 50V Electrolytic Capacitor, LED1: Green 3mm LED Light, R1: 1K 1/4W Resistor, USB1: USB 2.0 Female Connector, H1 H2: Male Header 4-Pins, H3 H4 H5 H6: Male Header 2-Pins, and H7: Male Header 4X2-Pins.
Circuit Working Explanation
The working principle of the 3.3V/5V power supply module for the MB102 breadboard is simple. The main components are AMS1117-3.3 and AMS1117-5.0 voltage regulator chips. When power is connected to the barrel jack (J1) and the switch (SW1) is turned ON, current flows through the reverse polarity protection diode (D1) to the circuit.
First, the 5V voltage regulator IC regulates the input voltage down to 5V. A green LED (LED1) with a current-limiting resistor (R1) is connected across the 5V output to indicate the power-on status. Then, the second voltage regulator IC (U2) steps down the 5V DC to 3.3V DC. Capacitors C1, C3, and C4 are used to filter out noise from the circuit, while capacitor C2 smooths the input voltage for IC U2.
There is also a USB connector (USB1) connected to the 5V supply, which can be used either as an input to power the module or as a 5V USB output source.
The rail output voltage selector is located on the top of the PCB via male header pins (H1 and H2), while the bottom male header pins (H3, H4, H5, and H6) provide connections for powering external components on the breadboard. Additionally, male header pins (H7) on the PCB provide output pins: two for +3.3V, two for +5V, and four for ground.
0 Comments: