MB 102 Breadboard Power Supply

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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
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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.

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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.


Getting ahead of the game…


If you wanna get straight to the point, scroll down until you see something red.

If you’ve just picked up the hobby and figured that you want to work your way around electronics, what they do, how they work, what the hell electricity is in the first place, I’d recommend you check out Great Scott’s YouTube channel, he has a playlist called Electronics Basics that would explain almost every small detail you need to know about electronics, both theoretically and practically. I quite frankly find this man to be fascinating when it comes to the way he explains everything and organizes his thoughts on a piece of paper and a video. He’s German so excuse his accent but I promise by the end of it you’ll come out a smart person.

Alright enough yapping and let’s get straight to the point. You’ve probably heard people recommend X brand over Y brand and giving you prices and numbers and all that crap but let me tell you one thing, at this point, as a hobbyist and a beginner, you don’t care about the brand. If you pay $100 for a solderer or $2, it’s going to be the same to you because you wouldn’t be using the temperature regulator with the built-in light, magnifying glass and holding a small capacitor using its helping arms while its fan blows away the fumes. You don’t even know what any of that means! So why waste a lot of money on things you don’t understand yet?

My advice to you, go basic, go cheap, and once you become knowledgeable enough, you’re going to be able to make your own decision on the brand you’re going to buy and the product you’re going to invest in. Or at the very least, you’ll have learned enough to know what to search for or ask about when you want to buy professional equipment.


I’ve purchased most of my tools using AliExpress, they’re cheap, safe to purchase with return policies, and you can get them without any shipping fees (might take sometime). So if you’re in a rush, you can try to find your closest electronics shop or website, otherwise, I’d recommend AliExpress. I’ll also be linking you to the cheapest products there should you choose to follow my advice.

First of all, you’re going to need a screw driver set. You probably have one laying around in the house but trust me, buy your own. Feeling like this screw driver is yours and yours only already gives you a sense of satisfaction and independence, making this hobby yours and no one else’s.

Screw Driver Set – Click here

Once you have this, you can start playing around with old electronics laying around, taking them apart and discovering each component once you’ve watched Great Scott’s videos that depict almost each and every component present in most electronics and how they work.

Second, you’ll need a multi-meter, these could be very expensive and complicated, or very cheap but effective. I chose the latter option. Most multi-meters will come with two wires, one red and one black. The picture says that the offer will last for 1 day, but as a regular AliExpress shopper, there’s always a deal.

Multi-meter – Click here

Now if you ask me, these are the two most essential tools you’ll need just to get things going in terms of learning and discovering. The tools below are what you’ll need once you want to get tweaking, taking things apart, salvaging components, building basic circuits, etc…

Third, you’ll need a soldering set, this will consist of the following

  1. Solderer: This is the stick that would heat up when you turn it on and it makes the soldering iron melt.

    Soldering gun.JPG
    Soldering Gun – Click here
  2.  Desoldering Pump: Desoldering is done when you want to remove a component that is already present on a board. There are many techniques and tools for that, one of the cheapest and easiest being a desoldering pump.
    Desoldering pump.JPG
    Desoldering Pump – Click here


  3. Soldering Iron: This is the iron that you’d need to melt in order to make components stick together. The reason why iron is used is because it is a great conductor of electricity.

    Soldering iron.JPG
    Soldering Iron – Click here
  4. Soldering Stand: When the soldering gun gets hot, it gets really hot. Laying it around on a wood/plastic table is hazardous. You’ll need a stand to lay it safely. I personally chose to build mine from scrap material I found laying around using a piece of wood, some of my mom’s laundry-hanging wires and a couple bolts but that’s about it. You can find yours for as little as $2 online.
    Soldering station.JPG
    Soldering Station – Click here

That’s pretty much it when it comes to you taking your already present electronics apart and testing them out. You might need a breadboard as well if you intend on designing things, but this is going to be saved for a later article about an Arduino’s beginner’s guide.

If you have any questions or anything you’d like to say leave one out in the comments or reach me out on any of my social media accounts.