2 layers139.7 × 73.7 mm
2 layers100 × 98.4 mm
K3ng cw scheme
mppks/k3ng_cw1My schematic for building the popular K3NG CW telegraph keyer
- Size
- 100 × 98.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 40
- Nets
- 45
- Pads
- 151
- Tracks, vias
- 102, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 16 May 2025
- Updated
- 24 Feb 2026
Overview
K3ng cw scheme is an open-source printed circuit board by mppks, from the mppks/k3ng_cw repository on GitHub. It is a 2-layer board of 100 × 98.4 mm with 40 parts on 45 nets, routed with 102 tracks and 0 vias.
Its parts include 13 resistors, 5 switches, 4 capacitors, 3 diodes and 3 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
README
README.mdK3NG CW keyer yet another version...
Schematic K3NG CW keyer
Applying my settings
To use my keyer settings, copy the files from the r1tbj_settings directory to the original k3ng firmware directory and add the following line to the keyer_hardware.h file
#define HARDWARE_R1TBJParts
40| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 10nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1, C2, C3, C4 |
| 4 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10, R11, R12, R13 |
| 3 | 470 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Vertical | R6, R7, R8 |
| 3 | LED | LED_THT:LED_D3.0mm | D1, D2, D3 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Vertical | R1, R2 |
| 2 | 220 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Vertical | R3, R4 |
| 2 | PC817 | Package_DIP:DIP-4_W7.62mm | U1, U2 |
| 1 | 100 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Vertical | R5 |
| 1 | 10k | Potentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV1 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9 |
| 1 | Arduino_Nano_v3.x | Module:Arduino_Nano | A1 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | CMD | Button_Switch_THT:SW_SPST_Omron_B3F-50xx | SW1 |
| 1 | INPUT KEY | Connector_Audio:Jack_3.5mm_CUI_SJ1-3525N_Horizontal | J1 |
| 1 | Keyboard | Footprints:Connector_Mini-DIN_Female_6Pin_2rows | J3 |
| 1 | MEM1 | Button_Switch_THT:SW_SPST_Omron_B3F-50xx | SW2 |
| 1 | MEM2 | Button_Switch_THT:SW_SPST_Omron_B3F-50xx | SW3 |
| 1 | MEM3 | Button_Switch_THT:SW_SPST_Omron_B3F-50xx | SW4 |
| 1 | MEM4 | Button_Switch_THT:SW_SPST_Omron_B3F-50xx | SW5 |
| 1 | OUTPUT KEY/PTT | Connector_Audio:Jack_3.5mm_CUI_SJ1-3525N_Horizontal | J2 |
The 33 most common of 40 parts.
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Questions
How big is the K3ng cw scheme PCB?
It measures 100 × 98.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the K3ng cw scheme use?
40 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 K3ng cw scheme KiCad files?
From the mppks/k3ng_cw repository on GitHub, at the commit this page was made from: the board is k3ng_cw_scheme/k3ng_cw_scheme.kicad_pcb and its schematic k3ng_cw_scheme/k3ng_cw_scheme.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the K3ng cw scheme design in my own project?
Its repository states no licence, so its author keeps all rights: ask mppks before reusing the design.