Breadboard Power Supply

A compact PCB breadboard power supply designed to provide clean, stable 3.3V and 5V rails for prototyping. It features onboard regulation, switchable voltage outputs, and full compatibility with standard breadboards—making it ideal for hobbyists, students, and rapid development workflows.

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Features

• Selectable 3.3V / 5V regulated outputs
• Standard breadboard-friendly dual-rail layout
• Barrel jack + toggle power switch
• High-quality capacitors for stable operation
• Compact through-hole design, easy to assemble

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Bill of Materials (BOM)

	Reference Designator	DNP	Part Name	Manufacturer	MPN	Qty	Footprint	Link	Notes	Price	Total Price
1	J1	No	Barrel Jack Switch	MPD (Memory Protection Devices)	EJ508B	1	THT	Link	12V	1.22	99.29
2	S1	No	Switch	E-Switch	EG1218	1	THT	Link	—	0.84	—
3	C1	No	Capacitor	TDK Corporation	FK20X7S1H106KR000	1	THT	Link	10uF	1.04	—
4	C2	No	Capacitor	Murata Electronics	RCER72A105K2DBH03A	1	THT	Link	1uF	0.79	—
5	C3	No	Capacitor	KEMET	C320C104K5R5TA	1	THT	Link	0.1uF	0.30	—

You can view the full BOM spreadsheet using the link below:

Full BOM (Google Sheets)

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Assembly

1. Solder all passive components first (capacitors, resistors if any).
2. Install connectors and switches.
3. Add voltage regulators and verify orientation.
4. Test each rail individually before inserting into a breadboard.

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Usage

1. Plug the module into your breadboard rails.
2. Connect power via the barrel jack.
3. Use the onboard switch to turn the supply on/off.

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License

This project is released under the MIT License. Feel free to use, modify, and share.

Some Pics of the Design!