2 layers147.9 × 171.2 mm
CoCoDragonMultiPak
jimbro1000/CoCoDragonMultiPak
This repository contains the designs for a Dragon 32/64 multipak interface based closely on the TRS-80 Color Computer multipak system.
64 parts1
4 layers86 × 34 mm
BB converter pcb
sumitisme/Buck-Converter-PCBComplete how-to on how to make a Buck converter using the lm2596 ic. Mostly did this for practice and I do realize that there are issues to address.
- Size
- 86 × 34 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 6
- Pads
- 38
- Tracks, vias
- 3, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 6 May 2026
- Updated
- 7 May 2026
Overview
BB converter pcb is an open-source printed circuit board by sumitisme, from the sumitisme/Buck-Converter-PCB repository on GitHub, published under the MIT licence. It is a 4-layer board of 86 × 34 mm with 15 parts on 6 nets, routed with 3 tracks and 0 vias.
It is built around the LM2596S-5.0 and MBRS340. Its parts include 4 diodes, 2 capacitors, 2 connectors, 1 resistor and 1 IC. It belongs with the power boards of this library.
Main components
2README
README.mdBuck-Converter-PCB
General selections for my design
The following were used (all selected from the datasheet):
- Buck converter -> LM2596S-5
- Inductor -> 47uH (L39) (for 5V 3A)
- Output Capacitor -> 220uF/10V AVX TPS series (SMT)
- Catch Diode -> MBRS340 (40V 4A support, The minimum voltage support required for my design i.e. 30V input was 37.5V)
- Input Capacitor -> 680uF, 35V electrolytic capacitor (Panasonic HFQ series or Nichicon PL series or Equivalent)
Also, the manufacturer selected for this specific design is JLCPCB. The tolerances have been imported from their template.
Schematic for the board
Layout of the board before routing
Layout after laying traces and rearranging a bit
3D View of the PCB
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_2.1mm | H1, H2, H3, H4 |
| 2 | Screw_Terminal_01x02 | TerminalBlock:TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | J1, J2 |
| 1 | 1N5400 | Diode_THT:D_DO-201AD_P15.24mm_Horizontal | D2 |
| 1 | 1N5821 | Diode_THT:D_DO-201AD_P15.24mm_Horizontal | D3 |
| 1 | 220uF | Capacitor_SMD:CP_Elec_6.3x5.4_Nichicon | C1 |
| 1 | 47uH | Inductor_SMD:L_Pulse_PA4320 | L1 |
| 1 | 680uF | Capacitor_SMD:CP_Elec_6.3x5.4_Nichicon | C3 |
| 1 | LED | LED_SMD:LED_0201_0603Metric | D4 |
| 1 | LM2596S-5 | Package_TO_SOT_SMD:TO-263-5_TabPin3 | U1 |
| 1 | MBRS340 | Diode_SMD:D_SMC | D5 |
| 1 | R | Resistor_SMD:R_0201_0603Metric | R1 |
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Questions
How big is the BB converter pcb PCB?
It measures 86 × 34 mm and has 4 copper layers, 1.6 mm thick.
What parts does the BB converter pcb use?
15 parts, built around the LM2596S-5.0 and MBRS340. 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 BB converter pcb KiCad files?
From the sumitisme/Buck-Converter-PCB repository on GitHub, at the commit this page was made from: the board is BB converter pcb/BB converter pcb.kicad_pcb and its schematic BB converter pcb/BB converter pcb.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the BB converter pcb design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).