2 layers100 × 80 mm
2 layers100 × 80 mm
Cwtrx
hmatuschek/cwtrx19Multiband QRP CW TRX based on the QCX
- Size
- 100 × 80 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 137
- Nets
- 104
- Pads
- 433
- Tracks, vias
- 400, 159
- Pours
- 7
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 9 May 2019
- Updated
- 13 Aug 2025
Overview
Cwtrx is an open-source printed circuit board by hmatuschek, from the hmatuschek/cwtrx repository on GitHub. It is a 2-layer board of 100 × 80 mm with 137 parts on 104 nets, routed with 400 tracks and 159 vias.
It is built around the ATMEGA328-PU, LM386 and 74HC74D, with the FST3253M, L7805 and BS170 among its other parts. Its parts include 49 capacitors, 43 resistors, 12 connectors, 10 ICs and 8 inductors. It belongs with the radio and wireless boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
6
ATMEGA328-PU
PDIP-28-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH PDIP-28 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
LM386
SOP-80.2% 0℃~+70℃ 4V~12V 4mA 50dB 700mWx1@8Ω Analog voltage gain SOP-8 Audio Amplifiers ROHSGcoreAudio Power OpAmps
74HC74D
SOIC-14-40℃~+125℃ 1 15ns 2 2V~6V 3.5pF 37ns@6V,50pF 3ns、3ns、3ns 40uA 5.2mA 5.2mA 74HC Series 82MHz Asynchronous Complementary D-Type Rising Edge Set and Reset SOIC-14 Flip Flops ROHSNexperiaFlip Flops
FST3253M
SOIC-16-40℃~+85℃ 4V~5.5V Multiplexer/Demultiplexer Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSonsemiSignal Switches, Multiplexers, Decoders
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BS170
TO-92-55℃~+150℃ 1 N-channel 1.2Ω@10V 17pF 2.1V 24pF 500mA 60V 7pF 830mW N-Channel TO-92 MOSFETs ROHSonsemiMOSFETs
README
README.mdMultiband QRP CW TRX based on the QCX
This repository contains all CAD files for the PCBs, documentation and firmware sourcecode for my small portable multi-band QRP CW transceiver.
License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Parts
137| Qty | Value | Footprint | References |
|---|---|---|---|
| 22 | 100n | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C3, C11, C22, C24, C26, C29, C32, C34, C37, C39, C40, C41, C46, C47, C48, C49 +6 |
| 7 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R1, R2, R11, R18, R24, R25, R28 |
| 7 | 3.3k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R7, R27, R30, R31, R33, R36, R37 |
| 6 | 100u | Inductor_THT:L_Axial_L7.0mm_D3.3mm_P2.54mm_Vertical_Fastron_MICC | L4, L5, L6, L7, L8, L9 |
| 5 | 470n | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C4, C5, C6, C7, C36 |
| 5 | LM833 | Package_DIP:DIP-8_W7.62mm_LongPads | U3, U5, U6, U7, U8 |
| 4 | 47n | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C12, C17, C21, C33 |
| 4 | GND | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4 |
| 3 | 100 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R20, R22, R23 |
| 3 | 100u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C2, C14, C19 |
| 3 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6, R40, R41 |
| 3 | 10n | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C30, C31, C35 |
| 3 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C15, C16, C42 |
| 3 | 1n | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C13, C20, C23 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R38, R42 |
| 2 | 1u | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C28 |
| 2 | 3.3k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical | R29, R35 |
| 2 | 3.3n | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C25, C27 |
| 2 | 33k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R12, R14 |
| 2 | 36k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R16, R17 |
| 2 | 50k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV1, RV2 |
| 1 | 10 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R15 |
| 1 | 100 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R21 |
| 1 | 100n | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C38 |
| 1 | 100u | Inductor_THT:L_Axial_L7.0mm_D3.3mm_P12.70mm_Horizontal_Fastron_MICC | L3 |
| 1 | 100u | Inductor_THT:L_Axial_L5.3mm_D2.2mm_P7.62mm_Horizontal_Vishay_IM-1 | L1 |
| 1 | 10K Log | DM3MAT:Connector_BKL_1x03_P2.54mm_Horizontal | J8 |
| 1 | 10k | Potentiometer_THT:Potentiometer_Runtron_RM-065_Vertical | RV4 |
| 1 | 120k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R8 |
| 1 | 1N4148 | Diode_THT:D_DO-35_SOD27_P2.54mm_Vertical_AnodeUp | D1 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical | R39 |
| 1 | 2.2k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R13 |
| 1 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R43 |
| 1 | 2N3904 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q2 |
| 1 | 3 x 8 @ FT37-43 | DM3MAT:Transformer_1P_2S_Toroid_Vertical_D10.5mm_Amidon-T37 | T1 |
| 1 | 30k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical | R9 |
| 1 | 30k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R10 |
| 1 | 4.3k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R32 |
| 1 | 4.7k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R4 |
| 1 | 470k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical | R19 |
| 1 | 47k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R5 |
| 1 | 47k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P15.24mm_Horizontal | R3 |
| 1 | 47n | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C18 |
| 1 | 5.1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R26 |
| 1 | 500 | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV3 |
| 1 | 7.5k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R34 |
| 1 | 74HC74 | Package_DIP:DIP-14_W7.62mm_LongPads | U9 |
| 1 | ATmega328-PU | Package_DIP:DIP-28_W7.62mm | U11 |
| 1 | AVR-ISP-6 | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J3 |
| 1 | BS170 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1 |
| 1 | Conn_Coaxial | DM3MAT:RCA_RND_205-00698_Horizontal | J13 |
| 1 | FST3253 | Package_SO:SOIC-16_4.55x10.3mm_P1.27mm | U1 |
| 1 | HP | DM3MAT:Connector_BKL_1x02_P2.54mm_Horizontal | J2 |
| 1 | Key | DM3MAT:Jack_3.5mm_Ledino_KB3SPRS_Horizontal | J5 |
| 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | U10 |
| 1 | LCD | DM3MAT:Connector_BKL_1x10_P2.54mm_Horizontal | LCD1 |
| 1 | LM386 | Package_DIP:DIP-8_W7.62mm_LongPads | U4 |
| 1 | LSB | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | ROT | DM3MAT:Connector_BKL_1x04_P2.54mm_Horizontal | J10 |
| 1 | RX-RF | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | SW | DM3MAT:Connector_BKL_1x02_P2.54mm_Horizontal | J7 |
| 1 | Si5351 | Connector_PinSocket_2.54mm:PinSocket_1x07_P2.54mm_Vertical | J9 |
| 1 | Supply | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J6 |
| 1 | ToPA | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J4 |
| 1 | TxOsc | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J11 |
| 1 | USB | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP2 |
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Questions
How big is the Cwtrx PCB?
It measures 100 × 80 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Cwtrx use?
137 parts, built around the ATMEGA328-PU, LM386, 74HC74D and FST3253M. 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 Cwtrx KiCad files?
From the hmatuschek/cwtrx repository on GitHub, at the commit this page was made from: the board is hardware/rx.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Cwtrx design in my own project?
Its repository states no licence, so its author keeps all rights: ask hmatuschek before reusing the design.