Tools, APP Software Used etc.

	KiCAD Kicad
	LT Spice

Description

LM317 + NE555 Bench Power supply 0-30V / 0-1 Amp

Build a cheap and reliable bench power supply, 0–30V & 0–1A with standard components like the LM317 and NE555.

This design is based on a ON-Semiconductor application note but simplified with common “jellybean” parts and a NE555 charge pump to generate the negative voltage reference needed for output control down to 0 Volt & 0 Amp.

Check out the YouTube video with a full explanation & demonstration of this power supply:

Watch the video:

https://youtu.be/TmOTqNCIk3g

GitHub Repository:

https://github.com/DesignGraveyard/V012_DIY_0-30V_0-1A_Lab_Power_Supply

Output Range: 0–30V DC / 0–1A Adjustable Current Limit

Components: 3x LM317 regulators, 1x NE555 timer, basic NPN jellybean transistors, standard passive parts

Negative Rail: Built-in NE555 charge pump (~7 kHz) providing -9V to bypass the LM317's 1.25V minimum limit

Metering: Cheap DC 100V 10A dual panel meter integration

Download Gerbers Download BOM(Bill of materials)

Oct 12,2026

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LM317 + NE555 Bench Power supply 0-30V / 0-1 Amp

2 Layers PCB 41.996 x 61.772 mm FR-4, 1.6 mm, 1, HASL lead free, Green Solder Mask, White silkscreen

Build a cheap and reliable 0–30V, 0–1A bench power supply using standard components like the LM317 and NE555. Based on On-Semi appnote.

Published: Oct 12,2026

Standard PCB

Download Gerber file 1

BOM(Bill of materials)

Other files for Assembly

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File Last Updated: 2026/10/12 (GMT+8)

File update record

2026-10-1217:29:26

Other files for Assembly are updated.

2026-10-1217:29:26

Parts List (BOM) is updated.

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Project images are for reference only. Actual production is based on the manufacturing files on the project page. Please review the designer's notes (e.g., PCB thickness) and select the appropriate options. PCBWay is not responsible for issues caused by unsuitable parameter selections.
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