2 layers72.3 × 87.3 mm
2 layers150 × 70 mm
Hydrogen - bakalarka
Jed0vcela/Gas-Flow-Control-and-Logging-SystemMass flow control and data acquisition platform based on Raspberry Pi Pico. Supports dual MFC control via RS-232, analog sensing (pressure, temperature, voltage), USB communication, and local button interface. Includes real-time data logging and modular hardware design with 3D-printed enclosure.
- Size
- 150 × 70 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 77
- Nets
- 73
- Pads
- 331
- Tracks, vias
- 715, 205
- Pours
- 406
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 2 Jun 2026
- Updated
- 2 Jun 2026
Overview
Hydrogen - bakalarka is an open-source printed circuit board by Jed0vcela, from the Jed0vcela/Gas-Flow-Control-and-Logging-System repository on GitHub. It is a 2-layer board of 150 × 70 mm with 77 parts on 73 nets, routed with 715 tracks and 205 vias.
It is built around the MAX3221CPW, MC34063AD and BC807, with the BC817, SMAJ30A and SMAJ5.0A among its other parts. Its parts include 26 capacitors, 17 resistors, 7 diodes, 7 connectors and 4 switches. It belongs with the RP2040 boards of this library.
Main components
6
MAX3221CPW
TSSOP-160℃~+70℃ 1 1 1uA 250Kbps 3V~5.5V Transceiver Yes ±15kV TSSOP-16 RS232 ICs ROHSTexas InstrumentsRS232 ICs
MC34063AD
SOIC-80℃~+70℃@(TA) 1 1.25V~40V 1.5A 100kHz 3V~40V Adjustable Boost、Buck Buck、Boost Built-in No SOIC-8 DC-DC Converters ROHSonsemiDC-DC Converters
BC807
SOT-23-65℃~+150℃ 1 PNP 100 100nA 345mW 45V 500mA 5V 700mV 80MHz PNP SOT-23 Bipolar (BJT) ROHSNexperiaBipolar (BJT)BC817
SOT-231 NPN 100nA 150MHz 300mW 40 45V 500mA 5V 700mV NPN SOT-23 Bipolar (BJT) ROHSShikuesBipolar (BJT)
SMAJ30A
DO-214AC(SMA)-55℃~+150℃ 30V 33.3V 400W 48.4V 5uA 8.3A TVS Unidirectional DO-214AC(SMA) ESD and Surge Protection (TVS/ESD) ROHSGOODWORKESD And Surge Protection (TVS/ESD)SMAJ5.0A
DO-214AC(SMA)-65℃~+150℃ 400W@10/1000us 43.5A 5V 7V 800uA 9.2V TVS Unidirectional DO-214AC(SMA) ESD and Surge Protection (TVS/ESD) ROHSMDDESD And Surge Protection (TVS/ESD)
Parts
77| Qty | Value | Footprint | References |
|---|---|---|---|
| 20 | 100n | Capacitor_SMD:C_0603_1608Metric | C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26 +4 |
| 11 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R4, R5, R7, R8, R12, R13, R14, R15, R16, R17 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_DIN965 | H1, H2, H3, H4 |
| 3 | SW_Push | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW2, SW3, SW4 |
| 3 | Thermistor_NTC | OptoDevice:R_LDR_5.1x4.3mm_P3.4mm_Vertical | NTC1, NTC2, NTC3 |
| 2 | 1k | Resistor_SMD:R_0603_1608Metric | R3, R11 |
| 2 | 1u | Capacitor_SMD:C_1206_3216Metric | C1, C9 |
| 2 | 47u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C2, C8 |
| 2 | DE9_Pins_MountingHoles | Connector_Dsub:DSUB-9_Pins_Horizontal_P2.77x2.84mm_EdgePinOffset4.94mm_Housed_MountingHolesOffset4.94mm | J6, J7 |
| 2 | D_Schottky | Diode_SMD:D_SMA | D3, D6 |
| 2 | LED | LED_SMD:LED_0603_1608Metric | D1, D2 |
| 2 | MAX3221 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U2, U3 |
| 1 | 1,5 | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | 100 | Resistor_SMD:R_0603_1608Metric | R9 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 100p | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric | C10 |
| 1 | 390u | Inductor_SMD:L_12x12mm_H8mm | L1 |
| 1 | 3k | Resistor_SMD:R_0603_1608Metric | R10 |
| 1 | BC807 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | BC817 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | Barrel_Jack_Switch | Connector_BarrelJack:BarrelJack_GCT_DCJ200-10-A_Horizontal | J8 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_15x7.5RM7.6 | BZ1 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J4 |
| 1 | Conn_01x14_Pin | Connector_PinHeader_2.54mm:PinHeader_1x14_P2.54mm_Vertical | J3 |
| 1 | DA15_Pins_MountingHoles | Connector_Dsub:DSUB-15_Socket_Horizontal_P2.77x2.84mm_EdgePinOffset4.94mm_Housed_MountingHolesOffset4.94mm | J5 |
| 1 | LED | LED_THT:LED_D5.0mm | D5 |
| 1 | MC34063AD | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | RaspberryPi_Pico_W | Module:RaspberryPi_Pico_W_SMD_HandSolder | A1 |
| 1 | RotaryEncoder | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW1 |
| 1 | SMAJ30A | Diode_SMD:D_SMA | D4 |
| 1 | SMAJ5.0A | Diode_SMD:D_SMA | D7 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_RND:TerminalBlock_RND_205-00287_1x02_P5.08mm_Horizontal | J1 |
The 76 most common of 77 parts.
Similar boards
- 4 layers100 × 100 mm
Rpi pico printer board
jackw01/pi-pico-printer-board
Tinkerer-friendly Klipper compatible 3D printer control board using Raspberry Pi Pico
224 parts42CERN-OHL-W-2.0 - 4 layers65.4 × 53.3 mm
Waterdrop esphome
twasilczyk/waterdrop-esphome
Waterdrop RO system smart Wi-Fi module for Home Assistant
39 parts15MIT - 2 layers40 × 25 mm
- 2 layers73.9 × 46 mm
- 2 layers90 × 90 mm
- 4 layers129 × 104.6 mm
- 2 layers89.6 × 79 mm
TDR 5351 core
MR-DOS/TDR_diploma_thesis
Time domain reflectometer. Includes Hardware, firmware and GUI in Octave. Also a diploma thesis.
199 parts33GPL-3.0
Questions
How big is the Hydrogen - bakalarka PCB?
It measures 150 × 70 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Hydrogen - bakalarka use?
77 parts, built around the MAX3221CPW, MC34063AD, BC807 and BC817. 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 Hydrogen - bakalarka KiCad files?
From the Jed0vcela/Gas-Flow-Control-and-Logging-System repository on GitHub, at the commit this page was made from: the board is hydrogen - KiCad, 3D files/hydrogen - bakalarka.kicad_pcb and its schematic hydrogen - KiCad, 3D files/hydrogen - bakalarka.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Hydrogen - bakalarka design in my own project?
Its repository states no licence, so its author keeps all rights: ask Jed0vcela before reusing the design.