2 layers84 × 69 mm
2 layers84 × 85 mm
Hbr mk2-rxtx
afiskon/hbr-mk276All HF bands QRP CW/SSB transceiver
- Size
- 84 × 85 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 239
- Nets
- 137
- Pads
- 659
- Tracks, vias
- 793, 75
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 9 Dec 2023
- Updated
- 9 Apr 2026
Overview
Hbr mk2-rxtx is an open-source printed circuit board by afiskon, from the afiskon/hbr-mk2 repository on GitHub, published under the MIT licence. It is a 2-layer board of 84 × 85 mm with 239 parts on 137 nets, routed with 793 tracks and 75 vias.
It is built around the LM358, NE5532 and L78L33ACU, with the 1N4148W, G6K-2F-Y-5V and MMBT3904 among its other parts. Its parts include 84 resistors, 69 capacitors, 17 diodes, 15 crystals and 11 connectors. It belongs with the radio and wireless boards and the STM32 and NXP (LPC, Kinetis, i.MX RT) boards of this library.
Main components
8
LM358
SOP-8-18V~18V 0℃~+70℃ 1.2MHz 10nA 2 24mA 3V~36V 500uA 50nA 5mV 80dB Built-in compensation SOP-8 Operational Amplifier ROHSMSKSEMIOperational AmplifierNE5532
SOP-8-22V~22V 0℃~+70℃ 100dB 10nA 14mA 2 40V/us 42mA 4mV 800nA 8nV/√Hz@30Hz Built-in compensation SOP-8 Operational Amplifier ROHSSungineOperational Amplifier
L78L33ACU
SOT-89-30℃~+125℃@(Tj) 1 1.7V 100mA 3.3V 30V 40uV 49dB@(120Hz) 6mA Fixed Over Current Protection、Over Temperature Protection、Short Circuit Protection Positive SOT-89-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSSTMicroelectronicsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching Diodes
G6K-2F-Y-5V
SMD,10x6.5mm-40℃~+70℃ 100mW 100mΩ 1A 237Ω 300mA@125VAC、1A@30VDC 3ms 3ms 5V 60V@DC、125V@AC Silver+gold alloy Two groups of conversions: 2C(Double-pole double-throw conversion) SMD,10x6.5mm Signal Relays ROHSOmronSignal Relays
MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
SS14
SMA(DO-214AC)-55℃~+150℃ 1A 25A 300uA@40V 40V 550mV@1A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky DiodesMMBT3906
SOT-23-55℃~+150℃ 1 PNP 100 100nA 200mA 200mW 300MHz 300mV 40V 5V PNP SOT-23 Bipolar (BJT) ROHSTWGMCBipolar (BJT)
README
README.mdHBR/MK2
All HF bands QRP CW/SSB transceiver "HomeBrew Radio, Mark 2".
- Covers 80, 40, 30, 20, 17, 15, 12 and 10 meters
- Classical single IF superheterodyne design
- Effective IF derived AGC
- Voice compression
- Supports RIT and XIT
- 10-30 WPM Elekey-B type keyer + straight key mode
- Keyer supports record and playback, programmable with paddles
- Five favorite frequencies per band (press NEXT/PREV in FAST mode)
- Class AB amplifier provides 5-10W in both CW and SSB
- Has a S-meter and a SWR meter
- Open-source firmware, schematic and 3D-printable enclosure
Links:
- Article (in Russian): https://eax.me/2024/2024-05-12-hbr-mk2-transceiver.html
- Post on Hackaday: https://hackaday.com/2024/05/13/github-hosts-ham-radio/
- Post on DXZone: https://www.dxzone.com/hbr-mk2-hf-qrp-cw-ssb-transceiver/
- Video blog on YouTube: https://www.youtube.com/playlist?list=PL6CWlCy5akj5v1Z4mPysYlqgNtCBYy-wM
- Video blog on Archive.org: https://archive.org/details/hbr-mk2-videos
Parts
239| Qty | Value | Footprint | References |
|---|---|---|---|
| 46 | 0.1u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C3, C10, C11, C12, C14, C15, C16, C17, C18, C19, C20, C22, C23, C24, C39 +30 |
| 15 | 9.000 | Crystal:Crystal_HC49-U_Vertical | Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9, Y10, Y11, Y12, Y13, Y14, Y15 |
| 13 | 1K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R9, R16, R20, R21, R27, R31, R38, R44, R57, R72, R75, R77 |
| 13 | 1N4148W | Diode_SMD:D_SOD-123 | D1, D2, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15 |
| 12 | 150 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R3, R11, R14, R23, R25, R49, R51, R64, R67, R82, R84 |
| 11 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1, J2, J3, J4, J5, J6, J7, J8, J9, J10, J11 |
| 9 | FT37-43 | Package_DIP:DIP-4_W7.62mm | L1, L2, L3, L4, L5, L6, L7, L8, L9 |
| 9 | G6K-2F-Y | Relay_SMD:Relay_DPDT_Omron_G6K-2F-Y | K1, K2, K3, K4, K5, K6, K7, K8, K9 |
| 7 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7, R12, R58, R70, R71, R73, R74 |
| 7 | 3.3K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6, R18, R28, R39, R45, R59, R78 |
| 7 | 56p | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C26, C28, C30, C32, C34, C36, C37 |
| 7 | 68 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8, R19, R29, R40, R46, R60, R79 |
| 6 | 22 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R42, R48, R55, R65, R69, R81 |
| 6 | 270p | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C27, C29, C31, C33, C35, C38 |
| 6 | 36 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R13, R24, R50, R66, R83 |
| 6 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4, Q5, Q9 |
| 4 | 1.3K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R37, R43, R56, R76 |
| 4 | 10u | Capacitor_SMD:CP_Elec_4x5.4 | C1, C58, C61, C63 |
| 4 | 51 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R30, R34, R35, R36 |
| 4 | 6 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R41, R47, R61, R80 |
| 4 | ADE-6 | RF_Mini-Circuits:Mini-Circuits_CD542_LandPatternPL-052 | U3, U4, U5, U7 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.5mm_Pad_Via | H1, H2, H3, H4 |
| 3 | 100 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R10, R22, R33 |
| 3 | 82 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R52, R53, R54 |
| 3 | 820 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4, R15, R26 |
| 2 | 10K | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV1, RV3 |
| 2 | 1N34/D311 | Diode_THT:D_DO-34_SOD68_P2.54mm_Vertical_AnodeUp | D3, D4 |
| 2 | SS14 | Diode_SMD:D_SMA_Handsoldering | D16, D17 |
| 1 | 1.5K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R32 |
| 1 | 1.8K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R68 |
| 1 | 100K | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV2 |
| 1 | 100u | Capacitor_SMD:CP_Elec_6.3x7.7 | C13 |
| 1 | 10n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C21 |
| 1 | 1n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C62 |
| 1 | 2.2K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R62 |
| 1 | 2.2u | Capacitor_SMD:CP_Elec_4x5.4 | C54 |
| 1 | 220 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R17 |
| 1 | 2N7002 | Package_TO_SOT_SMD:SOT-23 | Q7 |
| 1 | 47n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C25 |
| 1 | 680 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R63 |
| 1 | 820p | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4 |
| 1 | KT3142A | Package_TO_SOT_THT:TO-18-3 | Q6 |
| 1 | L78L33 | Package_TO_SOT_THT:TO-92_HandSolder | U1 |
| 1 | LM358 | Package_SO:SOIC-8_5.23x5.23mm_P1.27mm | U2 |
| 1 | Logo_Open_Hardware_Small | Symbol:OSHW-Logo2_9.8x8mm_SilkScreen | SYM1 |
| 1 | MMBT3906 | Package_TO_SOT_SMD:SOT-23 | Q8 |
| 1 | NE5532 | Package_SO:SOIC-8_5.23x5.23mm_P1.27mm | U6 |
| 1 | SYM_Radio_Waves_Large | Symbol:KiCad-Logo2_5mm_SilkScreen | SYM2 |
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Questions
How big is the Hbr mk2-rxtx PCB?
It measures 84 × 85 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Hbr mk2-rxtx use?
239 parts, built around the LM358, NE5532, L78L33ACU and 1N4148W. 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 Hbr mk2-rxtx KiCad files?
From the afiskon/hbr-mk2 repository on GitHub, at the commit this page was made from: the board is pcbs/rxtx/hbr-mk2-rxtx.kicad_pcb and its schematic pcbs/af/af-amplifier.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Hbr mk2-rxtx design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).