2 layers

V-3.0 BUILD

Copper layers: 2
Thickness: 1.6 mm
Parts: 54
Nets: 79
Pads: 204
Tracks, vias: 5, 0
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 29 Apr 2025
Updated: 23 Sep 2025

Overview

V-3.0 BUILD is an open-source printed circuit board by ekinefe, from the ekinefe/CW_keyer repository on GitHub. It is a 2-layer board with 54 parts on 79 nets, routed with 5 tracks and 0 vias.

It is built around the LM386 and PCF8574T. Its parts include 22 resistors, 10 switches, 8 capacitors, 3 connectors and 2 ICs. It belongs with the AVR (ATmega, ATtiny) boards of this library.

Main components

README

README.md

CW_keyer

Parts

Qty	Value	Footprint	References
8	10K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical	R2, R3, R4, R10, R11, R17, R20, RV1
8	1K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical	R1, R5, R6, R7, R8, R13, R14, R15
8	SW_Push	Button_Switch_THT:SW_PUSH_1P1T_6x3.5mm_H4.3_APEM_MJTP1243	SW1, SW5-CELAN1, SW5-F1, SW5-MODE1, SW6-F2, SW7-F3, SW8-F4, SW9-F5
4	R_Potentiometer	Potentiometer_THT:Potentiometer_Piher_T-16H_Single_Horizontal	RV1-Headphone_VOL1, RV2-Buzzur_TONE1, RV2-Buzzur_VOL1, RV2-Buzzur_WPM1
3	1 uF	Capacitor_THT:CP_Radial_D5.0mm_P2.50mm	C5, C6, C9
3	10uF	Capacitor_THT:CP_Radial_D5.0mm_P2.50mm	C1, C3, C4
1	0.05uF	Capacitor_THT:CP_Radial_D5.0mm_P2.50mm	C2
1	0.1uF	Capacitor_THT:CP_Radial_D5.0mm_P2.50mm	C7
1	100Ohm	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical	R19
1	100ohm	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical	R21
1	180	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical	R16
1	270	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical	R12
1	330	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical	R9
1	470	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical	R18
1	Arduino_Nano_Every	Module:Arduino_Nano	A1
1	Buzzer	Buzzer_Beeper:Buzzer_12x9.5RM7.6	BZ1
1	HeadPhon_Jack	Connector_Audio:Jack_3.5mm_CUI_SJ1-3515N_Horizontal	J1-OUTPUT2
1	LED_GREEN	LED_THT:LED_D4.0mm	D1-MRS1
1	LED_RED	LED_THT:LED_D4.0mm	D2-PWR1
1	LM386	Button_Switch_THT:SW_DIP_SPSTx03_Slide_9.78x9.8mm_W7.62mm_P2.54mm	U2
1	MIC_OUT	Connector_Audio:Jack_3.5mm_CUI_SJ1-3515N_Horizontal	J1-OUTPUT1
1	PADDLE_IN	Connector_Audio:Jack_3.5mm_CUI_SJ1-3515N_Horizontal	J1-OUTPUT3
1	PCF8574T	Package_SO:SOIC-16W_7.5x10.3mm_P1.27mm	U1
1	RotaryEncoder_Switch	Rotary_Encoder:RotaryEncoder_Bourns_Vertical_PEC12R-3x17F-Sxxxx	SW3
1	SW_DIP_x08	Button_Switch_THT:SW_DIP_SPSTx08_Slide_6.7x21.88mm_W7.62mm_P2.54mm_LowProfile	SW2
1	WC1602A	Display:WC1602A	DS1-2x16_LCD1

Questions

What parts does the V-3.0 BUILD use?

54 parts, built around the LM386 and PCF8574T. 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 V-3.0 BUILD KiCad files?

From the ekinefe/CW_keyer repository on GitHub, at the commit this page was made from: the board is V-3.0/V-3.0_BUILD/V-3.0_BUILD.kicad_pcb and its schematic BUILD/BUILD - I2C.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the V-3.0 BUILD design in my own project?

Its repository states no licence, so its author keeps all rights: ask ekinefe before reusing the design.

Category and platform

AVR (ATmega, ATtiny)

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/ekinefe-cw-keyer" title="V-3.0 BUILD in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/ekinefe-cw-keyer.jpg" alt="V-3.0 BUILD" width="1200" height="900">

A picture that opens the board, for a README

[![V-3.0 BUILD](https://pcbkit.io/embed/boards/ekinefe-cw-keyer.jpg?size=s)](https://pcbkit.io/boards/ekinefe-cw-keyer)

Source

Repository: ekinefe/CW_keyer
Board file: V-3.0/V-3.0_BUILD/V-3.0_BUILD.kicad_pcb
Commit: 01a37d2
Licence: Not stated

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