Transformerless power supply
About the Transformerless power supply PCB
Transformerless power supply is an open source PCB design by baleshwarece-jpg, published on GitHub. It is a 2-layer board measuring 60 × 45 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
30-Days-PCB-Design-Challenge
Designed and analyzed a compact transformerless power supply circuit to convert AC mains to regulated 5V DC output using capacitive voltage dropping technique. This design focuses on low-cost, small form-factor applications.
Capacitor (X-rated for AC dropping) Resistors (current limiting & discharge) Zener Diode (voltage regulation) Bridge Rectifier Voltage Regulator (e.g., LM7805) Filter Capacitor * Screw Terminals
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 | U1 |
| 2 | Screw_Terminal_01x02 | TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | 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 | 225k/2.2uf | C_Rect_L18.0mm_W6.0mm_P15.00mm_FKS3_FKP3 | C1 |
| 1 | 0.1Uf | C_Disc_D4.7mm_W2.5mm_P5.00mm | C2 |
| 1 | 1000Uf | CP_Radial_D10.0mm_P5.00mm | C3 |
| 1 | 475Uf | CP_Radial_D10.0mm_P3.80mm | C4 |
| 1 | 1M | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 2 | 20k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R3 |
| 1 | 2.2k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
Transformerless power supply design files
The KiCad project lives in the baleshwarece-jpg/PCB_PROJECTS 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 60 × 45 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 baleshwarece-jpg/PCB_PROJECTS 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 baleshwarece-jpg. Use it as a reference, and ask the author before reusing the design.
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