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MB102 Breadboard Power Supply Module 3.3V 5V – Rajib's Blog Rajib's Blog

MB102 Breadboard Power Supply Module 3.3V 5V


The Power Supply module fits perfectly on the MB102 motherboard.

Powering components on a breadboard is always challenging. Solderless breadboard certainly make it easy but for elegance, you will need to invest in an expensive bench power supply. Trying to power a mass of sensors using the power-pins on a Raspberry Pi or Arduino board is not a good idea because of the limitations placed on maximum current draw that these boards apply.

A $1 Breadboard Power Supply module from China is an elegant drop-in solution. It supports 6.5V – 12V input and outputs stable 3.3 V and 5V over two rails up-to 700mA. You can also configure it to supply 3.3V on both rails, 5V on both rails. By using a 3.3V to 5V Logic Level converter, you can freely power and mix up sensors that use 3.3V and 5V.

I used a relatively ordinary transformer based 1.5V – 12V 500mA variable power-supply that is used around the home to power electronic toys etc. and measured the voltage that was being output by the Power Supply Module.

Adapter Label Transformer Actual Output Module 3.3V Output Module 5V Output
1.5 3.06 0.69 1.5
3 4.6 2.17 2.99
4.5 6.7 3.33 4.9
6 8.53 3.33 5.02
7.5 10.52 3.33 5.03
9 12.84 3.33 5.03
12 15.56 3.34 5.03

Looking at the table, the following important points maybe noticed:

  • The board requires approx. 6.5V to trigger the stable output voltages. This means that you cannot power it off a Mobile Phone Charger (5V) or the USB port of a computer (5V).
  • The board continues to function even at 15V, but there is a slight increase in the voltage. Over a long period, the power regulators are likely to get damaged due to over-heating. It maybe safer to supply approx. 7.5V – 9V to the board for long-term persistent use.
  • The board does not feature a cut-off mechanism in case of under-voltage or over-voltage. Most electronic components do not work properly if the voltage levels are not within specification levels. Single board computers like the Raspberry Pi and Arduino in-fact hang-up and require reset.

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