2 layers68 × 38.5 mm
2 layers70.5 × 40 mm
Transformerless power supply
jh-emon002/PCBsHere, I will be posting my designed PCBs.
- Size
- 70.5 × 40 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 9
- Pads
- 37
- Tracks, vias
- 45, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 27 Jun 2026
- Updated
- 6 Jul 2026
Overview
Transformerless power supply is an open-source printed circuit board by jh-emon002, from the jh-emon002/PCBs repository on GitHub. It is a 2-layer board of 70.5 × 40 mm with 18 parts on 9 nets, routed with 45 tracks and 0 vias.
Its parts include 7 diodes, 4 capacitors, 4 resistors, 2 connectors and 1 IC. It belongs with the power boards of this library.
README
README.mdImages of the PCBs
1. AC to DC converter
A simple full bridge diode rectifier with smoothing capacitor and an indicator LED. It takes AC input in one side and outputs DC in the another.
2. Transformerless Power Supply
A 70x40 mm PCB that takes 110-220V AC at one side and outputs a stable 5V DC at another terminal. As there is no transformer, the circuit is compact and cheap.
3. Servo motor tester
A PCB that can be used to test servo motors using PWM signal controlled by a potentiometer.
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1, D2, D3, D4 |
| 2 | 20k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R2, R3 |
| 2 | D_Zener | Diode_THT:D_DO-201_P15.24mm_Horizontal | D5, D6 |
| 2 | Screw_Terminal_01x02 | TerminalBlock:TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | J1, J2 |
| 1 | 0.1uF | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C3 |
| 1 | 1000uF | Capacitor_THT:CP_Radial_D10.0mm_P2.50mm | C2 |
| 1 | 1M | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1 |
| 1 | 2.2k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R4 |
| 1 | 2.2uF | Capacitor_THT:C_Rect_L18.0mm_W5.0mm_P15.00mm_FKS3_FKP3 | C1 |
| 1 | 470uF | Capacitor_THT:CP_Radial_D10.0mm_P2.50mm | C4 |
| 1 | LED | LED_THT:LED_D5.0mm | D7 |
| 1 | LM7805_TO220 | Package_TO_SOT_THT:TO-220-3_Vertical | U1 |
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Questions
How big is the Transformerless power supply PCB?
It measures 70.5 × 40 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Transformerless power supply use?
18 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Transformerless power supply KiCad files?
From the jh-emon002/PCBs repository on GitHub, at the commit this page was made from: the board is Transformerless power supply/Transformerless power supply.kicad_pcb and its schematic AC to DC converter/ACtoDC.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Transformerless power supply design in my own project?
Its repository states no licence, so its author keeps all rights: ask jh-emon002 before reusing the design.