Toaster – The Triple Rail Step Up Breadboard Power Supply

Toaster is Triple output USB step up power supply module designed to fit snuggly into a breadboard. It is powered by a single 5V USB port or charger and outputs three voltages simultaneously, these being 3.3V, 5V and a variable supply which is capable of 5V to 16V. I am currently running a Kickstarter campaign for Toaster which you can feel free to check out here: Toaster on Kickstarter

The Kickstarter campaign has now ended and ended up doing really well. Thank you to all the backers! You can buy a Toaster from my Tindie page here:

Now that I think about it, that button is probably bigger than it needs to be, here’s a smaller version:

NOTE: Downloads are at the very bottom of this page.

The Story

Toaster came about when I wanted a simple breadboard power supply that could power my standard 3.3V / 5V digital circuits such as a microcontroller, but would also be able to run some analog circuitry at the same time. Since most breadboards these days seem to have dual supply rails, I decided to make something to fit the need and so Toaster was born!

Toaster is simple to use, simply plug it into your breadboard and then into a USB port or charger. Toaster will then provide you with 3.3V, 5V power supply rail plus another supply rail which is variable from 5V all the way up to 16V. All from a single 5V source!


Standard Dual Rail Breadboard Connection 

Toaster uses a really neat piece of electronics called a DC to DC converter which allows a smaller voltage to be boosted up to a larger voltage. In this case, the 5V input from the USB port can be boosted anywhere up to 16V. Fantastic for powering all sorts of analog circuits! This voltage step up does come at a cost however, the higher the voltage that you want, the more current the Toaster needs to draw from the USB port to achieve that voltage. Check out the table below to see the maximum current for each voltage setting.

Maximum Output Current Figures


  • Input Connection – USB Mini B and USB Micro
  • Input Voltage – 5Volts
  • Input Current (max) – 1Amp
  • Output Voltage 1 – 3.3 Volts
  • Output Voltage 2 – 5V
  • Output Voltage 3 – Variable 5 Volts to 16 Volts
  • Protection – 1.1Amp Resettable Fuse
  • Output Connection – Standard Dual Rail Breadboard 2.54mm (0.1″) Spacing.
  • Board Dimensions 50mm x 25mm

User Modified Toasters

John purchased a Toaster from Tindie and sent me a message with some info about a modification he made to his. He attached a nice little three digit voltmeter to the variable supply output – thereby getting rid of the need for a multimeter:


The following zip file contains the bill of materials, pcb and schematic design files and also gerber files. You will need DIPTRACE to view and edit the design files, however you won’t require DIPTRACE if you aren’t interested in editing the design files – PDF’s are included also.

Toaster 1.0 Files (763 downloads)

You can also download the Fritzing ‘virtual’ Toaster here:

Toaster Fritzing Design (913 downloads)