Main board
About the Main board
Main board is an open source STM32 PCB design by alangecker, published on GitHub. It is a 2-layer board measuring 100 × 98 mm, with 113 components from 51 distinct parts.
Its main chip is the HJT622, from the STM32 family. Other key parts include the 74HCT164 and TP4056. By type, the board carries 37 capacitors, 33 resistors, 18 fuses, 12 connectors, 5 ICs and 4 diodes.
Main components on the Main board
Main board bill of materials (BOM)
113 components, 51 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74HCT164 L78L33_SOT89 | SOT-89-3 | U1 |
| 1 | HJT622 STM32F072CBTx | LQFP-48_7x7mm_P0.5mm | U2 |
| 1 | TP4056 ADS1115IDGS | MSOP-10_3x3mm_P0.5mm | U3 |
| 1 | HJT622 MAX14921ECS+T | TQFP-80_12x12mm_P0.5mm | U4 |
| 1 | TP4056 MAX5035BASA | SOP-8_3.76x4.96mm_P1.27mm | U5 |
| 1 | AO3400 | SOT-23 | Q1 |
| 1 | CONN_01X08_MALE ModuleConnector | PinHeader_1x08_P2.54mm_Vertical | J1 |
| 1 | CONN_01X17_MALE USB | USB_B_OST_USB-B1HSxx_Horizontal | J2 |
| 2 | ShuntBoard | JST_XH_S6B-XH-A_1x06_P2.50mm_Horizontal | J3, J4 |
| 1 | SWD | PinHeader_1x04_P2.54mm_Vertical | J5 |
| 1 | Battery | PinHeader_1x17_P2.54mm_Vertical | J6 |
| 1 | 9-16 | TerminalBlock_RND_205-00238_1x08_P5.08mm_Horizontal | J7 |
| 1 | 0-8 | TerminalBlock_RND_205-00239_1x09_P5.08mm_Horizontal | J8 |
| 1 | Conn_01x02_Female | PinHeader_1x02_P2.54mm_Vertical | J9 |
| 1 | T1 | JST_XH_S2B-XH-A_1x02_P2.50mm_Horizontal | J11 |
| 1 | T2 | JST_XH_S2B-XH-A_1x02_P2.50mm_Horizontal | J12 |
| 1 | T3 | JST_XH_S2B-XH-A_1x02_P2.50mm_Horizontal | J13 |
| 16 | 2A | R_1812_4532Metric_Pad1.30x3.40mm_HandSolder | F1, F2, F3, F4, F5, F6, F7, F8 +8 |
| 2 | 1A | R_1812_4532Metric_Pad1.30x3.40mm_HandSolder | F17, F19 |
| 1 | 68V | D_SMB-SMC_Universal_Handsoldering | D1 |
Show 31 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LED | LED_D5.0mm | D2 |
| 1 | SS210A | D_SMA_Handsoldering | D4 |
| 1 | SMAJ5.0A | D_SMA_Handsoldering | D5 |
| 1 | LQH3C 220u | L_1210_3225Metric_Pad1.42x2.65mm_HandSolder | L1 |
| 1 | BLM21PG600SN1 | L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | L2 |
| 1 | 100u | L_Fastron_PISR_Handsoldering | L3 |
| 5 | 10UF 100nF | C_0805_2012Metric | C1, C2, C3, C4, C6 |
| 1 | 10UF 22u | C_1206_3216Metric | C5 |
| 2 | 10UF 1uF | C_0805_2012Metric | C7, C8 |
| 16 | 2u2 | C_0805_2012Metric | C9, C10, C11, C12, C13, C14, C15, C16 +8 |
| 7 | 100nF | C_0805_2012Metric | C25, C27, C29, C30, C32, C33, C34 |
| 1 | 68u 100V | CP_Radial_D12.5mm_P5.00mm | C26 |
| 1 | 1uF | C_0805_2012Metric | C28 |
| 1 | 22u | C_1206_3216Metric | C31 |
| 2 | 22u | C_1210_3225Metric_Pad1.42x2.65mm_HandSolder | C35, C36 |
| 1 | reserved | C_0805_2012Metric | C37 |
| 1 | 330 1K | C_0805_2012Metric | R1 |
| 1 | 1K5 1K | C_0805_2012Metric | R2 |
| 1 | 330 10k | R_0805_2012Metric | R3 |
| 1 | 1K5 62R | R_0805_2012Metric | R4 |
| 1 | 330 2k2 | R_0805_2012Metric | R5 |
| 1 | 1K5 2k2 | R_0805_2012Metric | R6 |
| 5 | 330 100 | R_0805_2012Metric | R7, R9, R11, R13, R15 |
| 5 | 1K5 100 | R_0805_2012Metric | R8, R10, R12, R14, R16 |
| 7 | 100 | R_0805_2012Metric | R17, R18, R19, R20, R21, R22, R23 |
| 2 | 10k | R_0805_2012Metric | R24, R25 |
| 1 | 220 | R_0805_2012Metric | R26 |
| 1 | 1K | C_0805_2012Metric | R27 |
| 3 | 100k | C_0805_2012Metric | R28, R29, R30 |
| 1 | 100m | R_0805_2012Metric | R31 |
| 2 | 2k2 | R_0805_2012Metric | R32, R33 |
Main board design files
The KiCad project lives in the alangecker/yabalancer repository on GitHub; these links point at the commit this page was built from.
Main board: common questions
What microcontroller does the Main board use?
The Main board is built around the HJT622, from the STM32 family.
How big is the Main board?
The Main board measures 100 × 98 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Main board?
113 components, from 51 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 Main board design files?
From the alangecker/yabalancer repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Main board design in my own project?
The repository has no license, so all rights stay with alangecker. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Main board without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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