Modern microcontroller projects require the use of multiple voltages to combine different parts. It is very common to prototype circuits that require both 5V and 3.3V (i.e. Arduino projects that use sensors or micro controller boards like chipKIT that interface with 5V devices, etc).
We created a breadboard power supply stick that provides both 5V and 3.3V. The voltage selection is user selectable, so you can power both power buses on a breadboard with same 5V, same 3.3V or mix 5V and 3.3V on the different buses.
The product comes with a fully assembled board, breakable male pin headers to solder and 2 jumpers to use as voltage selector.
You can find the assembly guide here:
http://mcukits.com/2012/07/03/assembling-the-breadboard-power-supply-dual-5v-and-3-3v/
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