2 layers105.8 × 128.5 mm
2 layers109.4 × 132.8 mm
LR312
Nakazoto/Data62010- Size
- 109.4 × 132.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 136
- Nets
- 81
- Pads
- 364
- Tracks, vias
- 805, 22
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 27 Jul 2025
- Updated
- 16 Sep 2025
Overview
LR312 is an open-source printed circuit board by Nakazoto, from the Nakazoto/Data620 repository on GitHub. It is a 2-layer board of 109.4 × 132.8 mm with 136 parts on 81 nets, routed with 805 tracks and 22 vias.
It is built around the 1N4148WT. Its parts include 63 diodes, 42 resistors, 16 capacitors, 14 transistors and 1 connector.
Main components
1Parts
136| Qty | Value | Footprint | References |
|---|---|---|---|
| 61 | 1N4148WT | Diode_THT:D_A-405_P12.70mm_Horizontal | D1, D2, D3, D10, D14, D21, D22, D23, D24, D25, D26, D27, D28, D29, D30, D31 +45 |
| 14 | PNP_EBC | Package_TO_SOT_THT:TO-18-3 | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14 |
| 13 | C_Small | Capacitor_THT:C_Rect_L10.0mm_W2.5mm_P7.50mm_MKS4 | C3, C4, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C19 |
| 12 | 18k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R2, R5, R14, R17, R20, R23, R26, R29, R32, R35, R38, R41 |
| 12 | 2.1k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R1, R6, R15, R18, R21, R24, R27, R30, R33, R36, R39, R42 |
| 12 | 7.5k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R3, R4, R13, R16, R19, R22, R25, R28, R31, R34, R37, R40 |
| 2 | 0.01 uF 100V | Capacitor_THT:C_Axial_L5.1mm_D3.1mm_P15.00mm_Horizontal | C1, C2 |
| 2 | 2k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R49, R50 |
| 2 | 39k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R45, R48 |
| 2 | 4.5V Zener | Diode_THT:D_A-405_P12.70mm_Horizontal | D11, D13 |
| 1 | 1.5k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R46 |
| 1 | 5.1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R44 |
| 1 | C_Small | Capacitor_THT:C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C18 |
| 1 | Conn_01x40 | Logi620:ELCO 40 | J1 |
Questions
How big is the LR312 PCB?
It measures 109.4 × 132.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the LR312 use?
136 parts, built around the 1N4148WT. 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 LR312 KiCad files?
From the Nakazoto/Data620 repository on GitHub, at the commit this page was made from: the board is Schematics/Reverse Engineering/LR312/LR312.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the LR312 design in my own project?
Its repository states no licence, so its author keeps all rights: ask Nakazoto before reusing the design.
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