12VAC-Dual-Output-Buck-Power-Supply
About the 12VAC-Dual-Output-Buck-Power-Supply PCB
12VAC-Dual-Output-Buck-Power-Supply is an open source PCB design by tb8-5, published on GitHub. It is a 2-layer board measuring 80.2 × 34.2 mm, with 23 components from 15 distinct parts.
Other key parts include the C2071056 and C780769. By type, the board carries 9 capacitors, 4 diodes, 3 connectors, 2 ICs, 2 inductors and 1 resistor.
It belongs with the power & battery designs in this gallery.
From the project
Custom 2-layer KiCad PCB converting 12VAC to regulated 5V and 3.3V outputs using full-wave rectification and synchronous buck converters.
Status: Fabricated / Bench-Validated (Rev A) Input: 12 VAC RMS, 60 Hz Outputs: Fixed 5 V and 3.3 V rails PCB: 2-layer, 80.15 mm × 34.20 mm, 1.6 mm FR-4 Copper: 35 µm top / 35 µm bottom Revision: Rev A Design tools: KiCad 9 and LTspice Test equipment: Tektronix oscilloscope, Keithley 2231A-30-3 bench supply, DMM, isolated 12 VAC transformer supply
This project is a compact AC-to-DC power supply PCB that accepts 12 VAC and produces two regulated DC outputs: 5 V and 3.3 V.
Main components on the 12VAC-Dual-Output-Buck-Power-Supply
12VAC-Dual-Output-Buck-Power-Supply bill of materials (BOM)
23 components, 15 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | C2071056 AP63205WU | TSOT-23-6 | U2 |
| 1 | C780769 AP63203WU | TSOT-23-6 | U3 |
| 1 | C5188434 12VAC IN | TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | J1 |
| 1 | C5188434 5V_Out | TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | J2 |
| 1 | C5188434 3V3_Out | TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | J3 |
| 1 | 3V3_Out | TestPoint_THTPad_D1.5mm_Drill0.7mm | 3V3 |
| 1 | 5V_Out | TestPoint_THTPad_D1.5mm_Drill0.7mm | 5V |
| 4 | C3058 1N4004 | D_DO-41_SOD81_P10.16mm_Horizontal | D1, D2, D3, D4 |
| 1 | C2454435 4.7uH | L_6.0x6.0_Pad1.8x5.7_Gap2.6 | L1 |
| 1 | C7325703 3.9uH | IND_ASPI-0628-3R9M-T1 | L2 |
| 1 | C1580768 1000uF | CP_Radial_D10.0mm_P5.00mm | C1 |
| 2 | C6119957 10uF | C_1206_3216Metric | C2, C6 |
| 2 | C127833 100nF | C_0603_1608Metric | C3, C7 |
| 4 | C386093 22uF | C_1206_3216Metric | C4, C5, C8, C9 |
| 1 | C242483 10k | R_1206_3216Metric | R1 |
12VAC-Dual-Output-Buck-Power-Supply design files
The KiCad project lives in the tb8-5/12VAC-Dual-Output-Buck-Power-Supply-PCB repository on GitHub; these links point at the commit this page was built from.
12VAC-Dual-Output-Buck-Power-Supply: common questions
How big is the 12VAC-Dual-Output-Buck-Power-Supply PCB?
The 12VAC-Dual-Output-Buck-Power-Supply measures 80.2 × 34.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the 12VAC-Dual-Output-Buck-Power-Supply?
23 components, from 15 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 12VAC-Dual-Output-Buck-Power-Supply design files?
From the tb8-5/12VAC-Dual-Output-Buck-Power-Supply-PCB 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 12VAC-Dual-Output-Buck-Power-Supply design in my own project?
The repository has no license, so all rights stay with tb8-5. Use it as a reference, and ask the author before reusing the design.
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