Transformerless-DC-power supply

Noraiz963·Transformerless-DC-power-supply·PCB layout/Powersupply.kicad_pcb

Transformerless-DC-power supply PCB layout, top view — open source board by Noraiz963

About the Transformerless-DC-power supply PCB

Transformerless-DC-power supply is an open source PCB design by Noraiz963, published on GitHub. It is a 2-layer board measuring 49 × 39 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 capacitor-dropper based transformerless power supply designed in KiCad, converting AC mains input into a regulated 5V DC output without using a bulky step-down transformer.

A capacitor-dropper based transformerless power supply designed in KiCad, converting AC mains input into a regulated 5V DC output without using a bulky step-down transformer.

The design is broken into functional stages:

1. AC voltage dropping (capacitive dropper): R1 (1MΩ bleeder) and C1 (2.2µF) drop the AC line voltage without a transformer, relying on the capacitor's reactance rather than resistive dissipation to minimize heat loss. 2. AC to pulsating DC: Full-wave bridge rectifier using 4x 1N4007 diodes (D1–D4). 3. Filtering: C2 (0.1µF) and C3 (1000µF) smooth the rectified output into a…

Transformerless-DC-power supply, from the project README — From the project README

Main components on the Transformerless-DC-power supply

Transformerless-DC-power supply bill of materials (BOM)

18 components, 12 distinct parts.

Qty	Part	Footprint	Refs
1	LM7805_TO220	TO-220-3_Vertical	U2
2	3.5mm	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	2.2u	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	470uf	CP_Radial_D10.0mm_P3.80mm	C4
1	1M	R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R1
2	20k	R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R2, R3
1	2.2k	R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R4

Transformerless-DC-power supply design files

The KiCad project lives in the Noraiz963/Transformerless-DC-power-supply repository on GitHub; these links point at the commit this page was built from.

LayoutPCB layout/Powersupply.kicad_pcb

Transformerless-DC-power supply: common questions

How big is the Transformerless-DC-power supply PCB?

The Transformerless-DC-power supply measures 49 × 39 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Transformerless-DC-power supply?

18 components, from 12 distinct parts. The full bill of materials is listed on this page.

Where can I download the Transformerless-DC-power supply design files?

From the Noraiz963/Transformerless-DC-power-supply repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Transformerless-DC-power supply design in my own project?

The repository has no license, so all rights stay with Noraiz963. Use it as a reference, and ask the author before reusing the design.

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