Transformerless power supply
About the Transformerless power supply PCB
Transformerless power supply is an open source PCB design by hammadurrehman2006, published on GitHub. It is a 2-layer board measuring 55.4 × 40.6 mm, with 18 components from 12 distinct parts.
Other key parts include the LM7805_TO220. By type, the board carries 7 diodes, 4 capacitors, 4 resistors, 2 connectors and 1 IC.
It belongs with the power & battery designs in this gallery.
From the project
A collection of KiCad PCB designs developed during my Electronic Engineering degree (2024-28). Includes university projects, personal experiments, and custom components—featuring schematics, layouts, Gerber files, and documentation. Open-source hardware for education, collaboration, and real-world manufacturing.
This is Day 2 of my 10-Day PCB Design Challenge, where I design PCB projects starting from simple circuits and gradually moving towards more complex ones.
For today’s design, I created a 2-layer transformerless power supply PCB using KiCad.
Main components on the Transformerless power supply
Transformerless power supply bill of materials (BOM)
18 components, 12 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LM7805_TO220 | TO-220-3_Vertical | U2 |
| 2 | Screw_Terminal_01x02 | TerminalBlock_bornier-2_P5.08mm | J1, J2 |
| 4 | 1N4007 | D_DO-41_SOD81_P10.16mm_Horizontal | D1, D2, D3, D4 |
| 2 | D_Zener | D_A-405_P7.62mm_Horizontal | D5, D6 |
| 1 | LED | LED_D5.0mm | D7 |
| 1 | 0.1uf | C_Disc_D4.7mm_W2.5mm_P5.00mm | C1 |
| 1 | 1000uf | CP_Radial_D10.0mm_P5.00mm | C2 |
| 1 | 470uf | CP_Radial_D10.0mm_P3.80mm | C3 |
| 1 | 2.2uf | C_Rect_L18.0mm_W6.0mm_P15.00mm_FKS3_FKP3 | C4 |
| 2 | 20k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2 |
| 1 | 1M | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 2.2k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
Transformerless power supply design files
The KiCad project lives in the hammadurrehman2006/kicad_lab repository on GitHub; these links point at the commit this page was built from.
Transformerless power supply: common questions
How big is the Transformerless power supply PCB?
The Transformerless power supply measures 55.4 × 40.6 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Transformerless power supply?
18 components, from 12 distinct parts. The full bill of materials is listed on this page.
Where can I download the Transformerless power supply design files?
From the hammadurrehman2006/kicad_lab repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Transformerless power supply design in my own project?
The repository has no license, so all rights stay with hammadurrehman2006. Use it as a reference, and ask the author before reusing the design.
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