Transformerless power supply

ajkumar-1907·POWER-ELECTRONICS-LIB·transformerless-power-supply/transformerless-power-supply.kicad_pcb

Transformerless power supply PCB layout, top view — open source board by ajkumar-1907

About the Transformerless power supply PCB

Transformerless power supply is an open source PCB design by ajkumar-1907, published on GitHub under the MIT license. It is a 2-layer board measuring 48.8 × 37.5 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 iot & wireless and power & battery designs in this gallery.

From the project

Open-source library of power electronics converter topologies — KiCad schematics, working principles, use cases, and design notes for DC-DC, AC-DC, DC-AC, and AC-AC converters. Free to use, modify, and build on.

An AC-DC power supply that produces a regulated 5 V DC output directly from 230 V AC mains without a transformer. A high-voltage X-rated capacitor drops the voltage, a bridge rectifier converts it to DC, and an LM7805 regulates the output.

Transformerless (capacitive dropper) supplies are used where cost and size matter more than isolation: smart plugs, LED bulbs, small appliance controllers and energy meters. Instead of stepping the voltage down with a transformer, a capacitor in series with the mains limits the current. Because a capacitor's reactance dissipates almost no real power, this…

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

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_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	225k/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 ajkumar-1907/POWER-ELECTRONICS-LIB 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 48.8 × 37.5 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 ajkumar-1907/POWER-ELECTRONICS-LIB 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?

Yes, under the terms of its MIT license, which ajkumar-1907 chose for the repository.

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