4 layers310 × 199 mm
4 layers310 × 110 mm
LowerBoard1v2
hsetlik/PolySynthAnalog polyphonic synth powered by STM32F4
- Size
- 310 × 110 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 287
- Nets
- 346
- Pads
- 1,345
- Tracks, vias
- 4,628, 1,929
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 27 May 2024
- Updated
- 6 Nov 2026
Overview
LowerBoard1v2 is an open-source printed circuit board by hsetlik, from the hsetlik/PolySynth repository on GitHub. It is a 4-layer board of 310 × 110 mm with 287 parts on 346 nets, routed with 4,628 tracks and 1,929 vias.
It is built around the STM32F411RET6, TPS56528DDA and TMUX4051PW, with the 74HC14, 74HC595 and 74HC74D among its other parts. Its parts include 140 capacitors, 56 resistors, 37 ICs, 20 connectors and 8 diodes. It belongs with the STM32 boards of this library.
Main components
12
STM32F411RET6
LQFP-64(10x10)-40℃~+85℃ 1.7V~3.6V 100MHz 128KB 12bit 32 Bit 50 512KB ARM Cortex-M4 Built-in FLASH LQFP-64(10x10) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
TPS56528DDA
HSOP-8-EP-40℃~+85℃@(TA) 1 4.5V~18V 600mV~7V 650kHz Adjustable Buck Buck Built-in Yes HSOP-8-EP DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
TMUX4051PW
TSSOP-16-12V~12V、5V~24V -55℃~+125℃ 1 140ns 190ns 20ns 280MHz 2pC 3pF 75Ω 8:1 Bidirectional analog channel、Glitch-free switching TSSOP-16 Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches, Multiplexers
74HC14
SOP-14-40℃~+85℃ 1.9V、3.98V、4.4V、5.48V、5.9V 100mV、260mV、260mV 20uA 25ns@4.5V,50pF 2V~6V 6 74HC Noise suppression function Schmitt trigger SOP-14 Inverters ROHSJSMSEMIInverters
74HC595
SOP-16-40℃~+85℃ 1 100ns@5V,50pF 10MHz 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSGRShift Registers74HC74D
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 Flops74HC04D
SOP-14-40℃~+125℃ 1 1.5V~4.2V 1.9V、3.7V、5.2V 100mV、400mV、400mV 14ns@6V,50pF 2V~6V 2uA 5.2mA 5.2mA 500mV~1.8V 6 74HC SOIC-14 Inverters ROHSNexperiaInverters
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) RegulatorsL7905
TO-220TO-220 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSKTPUncategorised
PMEG3030EP
SOD-1281 Independent 30V 360mV@3A 3A 50A 5mA@30V SOD-128 Schottky Diodes ROHSNexperiaSchottky Diodes
2N7002H
SOT-23-55℃~+150℃ 1 N-channel 2.1pF 2.8pF 210mA 26pF 352pC@4.5V 3V 3Ω@5V 510mW 60V N-Channel SOT-23 MOSFETs ROHSDiodes IncorporatedMOSFETsBSH205G2AR
TO-236AB-55℃~+175℃ 1 P-Channel 10W 118mΩ@4.5V 2.6A 20V 32pF 421pF 7nC@4.5V 900mV P-Channel TO-236AB MOSFETs ROHSNexperiaMOSFETs
Parts
287| Qty | Value | Footprint | References |
|---|---|---|---|
| 65 | 100n | Capacitor_SMD:C_0805_2012Metric | C201, C202, C302, C303, C304, C305, C306, C307, C308, C309, C1001, C1002, C1003, C1005, C1006, C1007 +49 |
| 57 | 470n | Capacitor_SMD:C_0805_2012Metric | C317, C318, C319, C320, C321, C322, C323, C324, C325, C326, C327, C328, C341, C342, C343, C344 +41 |
| 18 | 100k | Resistor_SMD:R_0805_2012Metric | R201, R202, R203, R204, R205, R206, R208, R209, R210, R211, R214, R215, R306, R307, R309, R401 +2 |
| 16 | TL074 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U201, U302, U303, U304, U305, U307, U309, U310, U311, U312, U315, U316, U317, U318, U319, U320 |
| 9 | 33R | Resistor_SMD:R_Array_Concave_4x0603 | RN401, RN402, RN403, RN404, RN405, RN701, RN702, RN703, RN704 |
| 8 | VoiceBoardConn_20P_200P | Connector_PinHeader_2.00mm:PinHeader_2x10_P2.00mm_Vertical | J501, J502, J503, J504, J505, J506, J507, J508 |
| 7 | TMUX4051 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U306, U308, U313, U314, U321, U322, U323 |
| 6 | 10k | Resistor_SMD:R_0805_2012Metric | R303, R304, R403, R404, R406, R502 |
| 6 | 220 | Resistor_SMD:R_0805_2012Metric | R436, R437, R440, R441, R443, R444 |
| 6 | LOOP | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R311, R427, R445, R446, R504, R1017 |
| 5 | 1u | Capacitor_SMD:C_0805_2012Metric | C203, C501, C502, C503, C504 |
| 4 | 2k2 | Resistor_SMD:R_Array_Concave_4x0603 | RN501, RN502, RN503, RN504 |
| 4 | 47k | Resistor_SMD:R_0805_2012Metric | R207, R305, R413, R442 |
| 4 | 6p | Capacitor_SMD:C_0805_2012Metric | C401, C402, C403, C407 |
| 3 | 10u | Capacitor_SMD:C_0805_2012Metric | C405, C418, C419 |
| 3 | 680 | Resistor_SMD:R_0805_2012Metric | R423, R428, R429 |
| 3 | PMEG3030 | Diode_SMD:D_SOD-123 | D403, D404, D408 |
| 2 | 22u | Capacitor_SMD:C_0805_2012Metric | C422, C423 |
| 2 | 27k | Resistor_SMD:R_0805_2012Metric | R308, R310 |
| 2 | 2N7002H | Package_TO_SOT_SMD:SOT-23 | Q401, Q402 |
| 2 | 2k2 | Resistor_SMD:R_0805_2012Metric | R501, R503 |
| 2 | 2u2 | Capacitor_SMD:C_0805_2012Metric | C413, C414 |
| 2 | 33R | Resistor_SMD:R_0805_2012Metric | R405, R438 |
| 2 | 3k3 | Resistor_SMD:R_0805_2012Metric | R301, R302 |
| 2 | 470 | Resistor_SMD:R_0805_2012Metric | R212, R213 |
| 2 | 4u7 | Capacitor_SMD:C_0805_2012Metric | C301, C410 |
| 2 | 74HC14 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1006, U1007 |
| 2 | 74HC595 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U1002, U1005 |
| 2 | 74HC74 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1001, U1003 |
| 2 | LED_RED | LED_SMD:LED_0805_2012Metric | D402, D406 |
| 1 | 12k | Resistor_SMD:R_0805_2012Metric | R425 |
| 1 | 16MHz | Crystal:Crystal_SMD_EuroQuartz_MT-4Pin_3.2x2.5mm | Y401 |
| 1 | 1N4148 | Diode_SMD:D_SOD-123 | D401 |
| 1 | 2.2uH | Inductor_SMD:L_Abracon_ASPI-4030S | L401 |
| 1 | 21R | Inductor_SMD:L_0805_2012Metric | FB402 |
| 1 | 2k7 | Resistor_SMD:R_0805_2012Metric | R426 |
| 1 | 32.768kHZ | Crystal:Crystal_SMD_SeikoEpson_MC306-4Pin_8.0x3.2mm | Y402 |
| 1 | 4k7 | Resistor_SMD:R_0805_2012Metric | R439 |
| 1 | 6N138 | Package_DIP:DIP-8_W7.62mm | U405 |
| 1 | 74HC04 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U404 |
| 1 | 90R | Inductor_SMD:L_0805_2012Metric | FB401 |
| 1 | AUDIO_OUT | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J201 |
| 1 | A_LOWER | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J901 |
| 1 | BOOT | Button_Switch_SMD:SW_SPST_B3U-1000P | SW402 |
| 1 | BSH205G2A | PCM_4ms_Package_SOT:SOT-23 | Q403 |
| 1 | B_LOWER | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J902 |
| 1 | C_LOWER | Connector_PinSocket_2.54mm:PinSocket_1x09_P2.54mm_Vertical | J903 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J401 |
| 1 | DAC7578xPW | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U301 |
| 1 | D_LOWER | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J904 |
| 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Vertical | U501 |
| 1 | L7905 | Package_TO_SOT_THT:TO-220-3_Vertical | U502 |
| 1 | LED_GRN | LED_SMD:LED_0805_2012Metric | D405 |
| 1 | MIDI_In | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J404 |
| 1 | MIDI_Out | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J406 |
| 1 | MIDI_Thru | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J407 |
| 1 | MMSZ5227C | Diode_SMD:D_SOD-123 | D407 |
| 1 | Micro_SD_Card_Det2 | Connector_Card:microSD_HC_Hirose_DM3D-SF | J405 |
| 1 | POWER | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J408 |
| 1 | RST | Button_Switch_SMD:SW_SPST_B3U-1000P | SW401 |
| 1 | STM32F411RET6 | Package_QFP:LQFP-64_10x10mm_P0.5mm | U401 |
| 1 | SWD Header | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J403 |
| 1 | TCA9548APWR | Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm | U503 |
| 1 | TPS56528DDA | Package_SO:Texas_HSOP-8-1EP_3.9x4.9mm_P1.27mm_ThermalVias | U402 |
The 284 most common of 287 parts.
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Questions
How big is the LowerBoard1v2 PCB?
It measures 310 × 110 mm and has 4 copper layers, 1.6 mm thick.
What parts does the LowerBoard1v2 use?
287 parts, built around the STM32F411RET6, TPS56528DDA, TMUX4051PW and 74HC14. 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 LowerBoard1v2 KiCad files?
From the hsetlik/PolySynth repository on GitHub, at the commit this page was made from: the board is Old/LowerBoard1v2/LowerBoard1v2.kicad_pcb and its schematic Old/LowerBoard1v2/AudioOut.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LowerBoard1v2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask hsetlik before reusing the design.