Tindie Blog | Switchable Multi-Voltage Breadboard Power Supply

There’s a high chance you started out prototyping electronics on a breadboard and you probably still are! My early breadboard experiments always seemed to have a PP3 battery hanging off them, and regularly getting disconnected. These days I have a few different power supplies at my disposal so you might wonder why this Breadboard Power Supply caught my eye.

First of all, it looks neat and tidy. Sat across the edge of a breadboard with a Micro USB input it looks similar to lots of Breadboard power supplies. Its clever design has some very nicely integrated 3-position switches that are SMD mounted on the underside of the board. There are four of these switches arranged into 2 pairs. Viewed from above the left-hand pair controls the first voltage selection, ‘V1 Config’, and then the lower switch controls the left-hand output. The ‘V1 Config’ can switch between 3.3V, 3.0V and 2.5V and the ‘Output Left’ switch can assign the left-hand power rails as off, V1 or V2. Over on the other side, we have another pair of switches with the ‘V2 Config’ switch allowing V2 to be set at 5.0V, 1.8V, and 1.5V. Again the lower switch on the right-hand side sets the right-hand output to off, V1 or  V2.

This means that either set of power rails of our standard breadboard can be switched to any of the 6 available voltages, without having to unclip anything or rewire jumpers on the breadboard. It certainly strikes us as a very clean and useful solution and if you check out the _dralexander_ shop you’ll find he has a USB-C version of this board, as well as other useful power supply designs.