2 layers105.8 × 128.5 mm
2 layers107.1 × 130.1 mm
- Size
- 107.1 × 130.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 100
- Nets
- 69
- Pads
- 284
- Tracks, vias
- 750, 5
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 27 Jul 2025
- Updated
- 16 Sep 2025
Overview
DM23 is an open-source printed circuit board by Nakazoto, from the Nakazoto/Data620 repository on GitHub. It is a 2-layer board of 107.1 × 130.1 mm with 100 parts on 69 nets, routed with 750 tracks and 5 vias.
It is built around the 1N755A-1. Its parts include 38 resistors, 25 capacitors, 17 diodes, 9 transistors and 1 connector.
Main components
1Parts
100| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | D_Small | Diode_THT:D_A-405_P12.70mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8, D10, D11, D12, D13, D14, D15, D16, D17 +1 |
| 15 | C | Capacitor_THT:C_Rect_L9.0mm_W2.5mm_P7.50mm_MKT | C1, C2, C5, C6, C7, C8, C9, C10, C13, C14, C15, C16, C17, C20, C21 |
| 9 | 1k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P15.24mm_Horizontal | R1, R4, R10, R15, R18, R19, R29, R30, R31 |
| 9 | 2N1499A | Package_TO_SOT_THT:TO-39-3 | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9 |
| 7 | 5.1k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P15.24mm_Horizontal | R7, R8, R13, R16, R25, R26, R38 |
| 6 | 10k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P15.24mm_Horizontal | R5, R9, R20, R24, R32, R36 |
| 6 | 2.4k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P15.24mm_Horizontal | R2, R3, R21, R23, R33, R35 |
| 6 | 39k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P15.24mm_Horizontal | R11, R12, R14, R17, R27, R28 |
| 6 | TestPoint | TestPoint:TestPoint_Keystone_5000-5004_Miniature | TP1, TP2, TP3, TP4, TP5, TP6 |
| 3 | 0.1uF 150V | Capacitor_THT:C_Axial_L5.1mm_D3.1mm_P15.00mm_Horizontal | C22, C23, C24 |
| 3 | 20k | Potentiometer_THT:Potentiometer_Bourns_3006W_Horizontal | RV1, RV2, RV3 |
| 3 | 22nF 200V 10% | Capacitor_THT:CP_Axial_L11.0mm_D5.0mm_P18.00mm_Horizontal | C4, C12, C19 |
| 3 | 2k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P15.24mm_Horizontal | R6, R22, R34 |
| 3 | 3.3nF 100V | Capacitor_THT:CP_Axial_L10.0mm_D4.5mm_P15.00mm_Horizontal | C3, C11, C18 |
| 1 | 1N755A? | Diode_THT:D_A-405_P12.70mm_Horizontal | DZ1 |
| 1 | 330 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P15.24mm_Horizontal | R37 |
| 1 | 68nF 150V | Capacitor_THT:CP_Axial_L11.0mm_D6.0mm_P18.00mm_Horizontal | C25 |
| 1 | Conn_01x40 | Logi620:ELCO 40 | J1 |
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Questions
How big is the DM23 PCB?
It measures 107.1 × 130.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the DM23 use?
100 parts, built around the 1N755A-1. 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 DM23 KiCad files?
From the Nakazoto/Data620 repository on GitHub, at the commit this page was made from: the board is Schematics/Reverse Engineering/DM23/DM23.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the DM23 design in my own project?
Its repository states no licence, so its author keeps all rights: ask Nakazoto before reusing the design.