HardLabs

Transformerless power supply

Srushti-D-Hebbar·transformerless-power-supply·hardware/transformerless_psu.kicad_pcb

Transformerless power supply PCB layout, top view — open source board by Srushti-D-Hebbar

About the Transformerless power supply PCB

Transformerless power supply is an open source PCB design by Srushti-D-Hebbar, published on GitHub under the MIT license. It is a 2-layer board measuring 56.2 × 35.3 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

Two-layer transformerless power supply designed in KiCad, featuring AC rectification, capacitive voltage dropping, zener protection, and 5V regulation.

A compact two-layer transformerless power supply designed in KiCad. The circuit uses a capacitive dropper, full-wave bridge rectifier, zener protection, filtering, and an LM7805 linear regulator to produce a regulated 5V DC output.

The circuit accepts an AC input through a screw terminal and uses a capacitive dropper network to limit the input current before rectification. A four-diode bridge rectifier converts the AC waveform into pulsating DC, which is then filtered using electrolytic and ceramic capacitors.

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

Main components on the Transformerless power supply

LM7805_TO220

Transformerless power supply bill of materials (BOM)

18 components, 12 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LM7805_TO220
U1
2
SCREW_TERMINAL_01X02
Screw_Terminal_01x02
J1, J2
4
1N4007
D1, D2, D3, D4
2
D_Zener
D5, D6
1
LED
D7
1
0.1UF
0.1uF
C1
1
1000UF
1000uF
C2
1
470UF
470uF
C3
1
2.2UF
2.2uF
C4
2
20K
20k
R1, R2
1
1M
R3
1
2.2K
2.2k
R4

Transformerless power supply design files

The KiCad project lives in the Srushti-D-Hebbar/transformerless-power-supply 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 56.2 × 35.3 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, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Transformerless power supply design files?

From the Srushti-D-Hebbar/transformerless-power-supply repository on GitHub, which has the KiCad layout, the schematic and the BOM; 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 Srushti-D-Hebbar chose for the repository.

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