HardLabs

Breadboard Power Supply

Evan6678·Breadboard_Power_Supply

Breadboard Power Supply PCB layout, top view — open source board by Evan6678

About the Breadboard Power Supply PCB

Breadboard Power Supply is an open source PCB design by Evan6678, published on GitHub. It is a 2-layer board measuring 44.4 × 51 mm, with 29 components from 21 distinct parts.

Other key parts include the LM7805_TO220 and LM317_TO-220. By type, the board carries 9 connectors, 7 capacitors, 5 resistors, 4 diodes, 2 ICs and 1 transistor.

It belongs with the power & battery and dev boards & breakouts designs in this gallery.

From the project

A compact through-hole breadboard power supply designed in KiCad that converts a 9 V input to selectable 5 V or 3.3 V outputs for learning PCB design and practical electronics.

A simple and solder-friendly breadboard power supply designed in KiCad. This board takes a 9 V input from a barrel jack and provides a regulated 5 V or 3.3 V output through jumper-selectable headers and screw terminals. It is built entirely with through-hole components so it is easy to assemble, troubleshoot, and practice soldering on a real PCB.

This project is part of my ongoing work to learn KiCad, electronics fundamentals, and the full workflow of designing and building PCBs from scratch. It serves as my starting point for future hardware projects that will build on these skills.

Breadboard Power Supply, from the project README
From the project README

Main components on the Breadboard Power Supply

LM7805_TO220LM317_TO-220

Breadboard Power Supply bill of materials (BOM)

29 components, 21 distinct parts.

QtyPartRefs
1
LM7805_TO220
U1
1
LM317_TO-220
U2
1
AO3401A
Q1
1
Barrel_Jack
J1
2
Conn_01x03_Pin
J2, J6
4
Conn_01x02_Pin
J3, J4, J7, J8
2
Screw_Terminal_01x02
J5, J9
1
OS102011MS2QN1
S1
1
1N5822
D1
2
1N4007
D2, D3
1
LED
D4
1
47nF
C1
1
0.33uF
C2
2
0.1uF
C3, C6
2
10uF
C4, C5
1
1uF
C7
1
10K
R1
1
100
R2
1
470
R3
1
330
R4
Show 1 more
QtyPartRefs
1
200
R5

Breadboard Power Supply design files

The KiCad project lives in the Evan6678/Breadboard_Power_Supply repository on GitHub; these links point at the commit this page was built from.

Breadboard Power Supply: common questions

How big is the Breadboard Power Supply PCB?

The Breadboard Power Supply measures 44.4 × 51 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Breadboard Power Supply?

29 components, from 21 distinct parts. The full bill of materials is listed on this page.

Where can I download the Breadboard Power Supply design files?

From the Evan6678/Breadboard_Power_Supply repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Breadboard Power Supply design in my own project?

The repository has no license, so all rights stay with Evan6678. Use it as a reference, and ask the author before reusing the design.

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