HardLabs

CW Keyer Shield

softerhardware·CWKeyer·hardware/teensy_4p0_shield/TeensyKeyerShield.kicad_pcb

CW Keyer Shield layout, top view — open source NXP board by softerhardware

About the CW Keyer Shield

CW Keyer Shield is an open source NXP PCB design by softerhardware, published on GitHub. It is a 2-layer board measuring 100 × 50 mm, with 96 components from 27 distinct parts.

Its main chip is the Teensy4.0, from the NXP family. Other key parts include the WM8960 and MOCD217R2M. By type, the board carries 39 capacitors, 17 inductors, 14 resistors, 12 connectors, 3 ICs and 1 jumper.

It belongs with the audio, dev boards & breakouts and rf & radio designs in this gallery.

From the project

CW Keyer for Teensy 4.0

This project is a CW keyer for amateur radio. The hardware connects to a PC with USB. It then appears as an audio device for radio sound output and microphone input. It is also a Midi device to signal key up/down to the PC software, and a serial device for a connection to logging or other software on the PC. It is designed for the Hermes-Lite 2.0 or other SDR software. The radio sound is sent to the keyer and the keyer generates a sidetone, mixes it with the audio and sends it to the headphones or speaker. The sidetone has zero delay and is suitable for high speed CW. The keyer can also be…

CW Keyer Shield, from the project README
From the project README

Main components on the CW Keyer Shield

WM8960MOCD217R2MTeensy4.0

CW Keyer Shield bill of materials (BOM)

96 components, 27 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
WM8960
U1
1
MOCD217R2M
U2
1
Teensy4.0
U3
4
C20079
Conn_01x02
J1, J2, J3, J4
6
C16684
AudioJack3_SwitchTR
J5, J6, J7, J8, J9, J12
1
C2321
Conn_01x04
J10
1
C492422
Conn_02x05_Odd_Even
J11
1
C65114
Conn_02x03_Odd_Even
JP1
4
TestPoint_Alt
MH1, MH2, MH3, MH4
1
5A0-3729-M-42-008
MEMSMIC
MIC1
4
25K
RV1, RV2, RV3, RV4
1
SP0503BAHTG
D1
12
C76892
Ferrite_Bead_Small
FB1, FB2, FB3, FB4, FB5, FB6, FB7, FB8 +4
4
15UH
15uH
L1, L2, L3, L4
1
BLM18BD252SN1
L5
7
47UF
47uF
C1, C6, C7, C8, C12, C22, C34
11
0.1UF
0.1uF
C2, C3, C4, C5, C10, C25, C26, C27 +3
3
1UF
1uF
C9, C11, C15
12
33PF
33pF
C13, C14, C18, C19, C20, C21, C23, C24 +4
2
470NF
470nF
C16, C17
Show 7 more
QtyPartRefs
4
10NF
10nF
C29, C30, C31, C32
2
4.7K
R1, R2
3
47K
R3, R6, R7
1
33OHM
33
R4
1
680OHM
680
R5
4
DNI
R8, R9, R12, R13
3
470OHM
470
R10, R11, R14

CW Keyer Shield design files

The KiCad project lives in the softerhardware/CWKeyer repository on GitHub; these links point at the commit this page was built from.

CW Keyer Shield: common questions

What microcontroller does the CW Keyer Shield use?

The CW Keyer Shield is built around the Teensy4.0, from the NXP family.

How big is the CW Keyer Shield?

The CW Keyer Shield measures 100 × 50 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the CW Keyer Shield?

96 components, from 27 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the CW Keyer Shield design files?

From the softerhardware/CWKeyer repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the CW Keyer Shield design in my own project?

The repository has no license, so all rights stay with softerhardware. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the CW Keyer Shield without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug NXP firmware against it before you order a PCB.

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