Handy Power Supply Module in a Breadboard

Overview

The project introduces a newly improved breadboard power supply with additional header pins to bring power out to both sides of the board while adding some extra stability.

Explanation

The circuit describes the improvements for the second revision of SBBPWR1 which is a handy power supply module that plugs directly into a solderless breadboard.  The new SBBPWR2 is wider and includes some header pins along the center area. The power rails on the breadboard are being picked up by the outer header pins which are found in both boards. The VIN and VADJ signals from the older board were brought out to two inner headers while the new board replaces these two inner headers with 4 headers which add stability to the board. More header pins can be accommodated in the center area because the board is wider.

There are 3 resistors on the SBBPWR2 that makes up the LM317 VADJ voltage divider. A jumper is used in the board to enable selecting to one of the three position switches between OFF – 3.3V and 5V. The jumper OFF selection is the 3.3V while the resistors were supplied to make the desired selection.