MB 102 Breadboard Power Supply

If you wanna get straight to the point scroll down until you see RED

As an apprentice at electronics and moving further from taking components apart and discovering, you might be considering going a step further by trying to build something. Your first step there is probably Arduino, and to be more specific, the Arduino UNO. I’ll go for a step-by-step explanation about Arduino in a different post. Raspberry Pi is also an option but is more software oriented and a little more complex to set up than the plug-and-play Arduino.
At first you’re going to start with your average Blinking LED (the hardware version of Hello World) but then you’re going to be moving further, trying to use different components, sensors, modules, shields, etc… You can always power those using the Arduino itself but a lot of components means a lot of power, amps, something the Arduino might not have enough of.
For instance, I’m working on a project using Arduino which needs WiFi. The UNO itself doesn’t have the ability for WiFi so I’m using a component called ESP8266 which requires 3.3V to run. The UNO could supply that, but the ESP sometimes could use up to 500 mA which is out of the UNO’s reach. For that reason, you’re going to need an external power supply. Of course you can use a voltage regulator that transforms any DC power source into your desired voltage value but you’re always better off regulating your power supply with a digital component. Let’s start explaining a few things.


Some of its specs:

  • You can mount it in directly onto the breadboard as shown in the image below
Related image
MB 102 breadboard mounting

If you turn it over, you’ll notice 2 rows of pins (2 pins to the left, 2 pins to the right on each row). You want to make sure both rows are fitting in the breadboard holes.

MB 102 Pinout
  • The Pinout is depicted below
    1. DC Adapter Jack (INPUT)
    2. USB (INPUT)
    3. ON/OFF Indicator
    4. 2 x 3.3V and 2 x 5V auxiliary outputs
    5. Jumper to control desired output voltage
      1. If jumper connects the pins next to 5V, it will provide 5 V
      2. If jumper connects the pins next to OFF, it will provide 0V
      3. If jumper connects the pins next to 3.3V, it will provide 3.3V
    6. Actual output pins
    7. ON/OFF Switch
  • I would recommend you power it using the DC Adapter Jack with any DC voltage source between 6V to 9V. It can withstand higher voltages but this is the best I recommend.
  • It’s always good practice to plug it, turn it on, then use a voltmeter to check the output voltage before using it to supply any device.

As I’ve previously mentioned, you can always use a voltage regulator but I always prefer using this one to avoid confusion when it comes to wiring the voltage regulator below, easier power supply instead of having to strip a DC adapter and connect it manually to your regulator then taking two wires from the regulator into the supply rail of the breadboard. All in all, it’s way simpler and less of a mess.

Image result for voltage regulator
Voltage Regulator

If you have any questions, suggestions, modifications, leave them out in the comments below or give me a text on social media or WhatsApp.


Got a different opinion or a question? Be my guest.

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