2 layers46 × 71 mm
I2C LED BTN CH32V
bml3mk5/L3S1VirtualFloppy
Virtual Floppy Card for HITACHI Basic Master Level3 / MB-S1
32 parts
2 layers124.5 × 87.5 mm
S1VirtualFloppy
bml3mk5/L3S1VirtualFloppyVirtual Floppy Card for HITACHI Basic Master Level3 / MB-S1
- Size
- 124.5 × 87.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 71
- Nets
- 127
- Pads
- 413
- Tracks, vias
- 1,952, 192
- Pours
- 27
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 1 Feb 2026
- Updated
- 2 Feb 2026
Overview
S1VirtualFloppy is an open-source printed circuit board by bml3mk5, from the bml3mk5/L3S1VirtualFloppy repository on GitHub. It is a 2-layer board of 124.5 × 87.5 mm with 71 parts on 127 nets, routed with 1,952 tracks and 192 vias.
It is built around the 74HC125D, 74LCX541WM and 27C256-17/J, with the 74HC02, 74HC08D and 74HC133D among its other parts. Its parts include 23 resistors, 15 capacitors, 12 ICs, 10 connectors and 4 diodes.
Main components
12
74HC125D
SO-14-40℃~+125℃ 1 11ns@4.5V,50pF 160uA 2V~6V 4 7.8mA 7.8mA 74HC Tri-State Unidirectional SOIC-14 Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
74LCX541WM
SOIC-20-300mil-40℃~+85℃ 10uA 24mA 24mA 2V~3.6V 6.5ns@3.3V,50pF 74LCX 8 Power-off isolation、Output enable、Hot-swap support Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSonsemiBuffer/Driver/Transceiver27C256-17/J
-0℃~+70℃ 256Kbit 4.5V~5.5V EPROM Parallel Port (Parallel) - Non-Volatile Memory (ROM)Microchip TechnologyNon-Volatile Memory (ROM)74HC02
-- Logic Gates ROHSonsemiLogic Gates74HC08D
SOP-14-40℃~+125℃ 1.5V~4.2V 1.9V、3.7V、5.2V 100mV、400mV 2 27ns@4.5V,50pF 2V~6V 2uA 4 5.2mA 5.2mA 500mV~1.8V 74HC Series AND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates
74HC133D
SOIC-16-40℃~+125℃ 1 1.5V~4.2V 10ns@6V,50pF 13 1uA 2V~6V 5.2mA 5.2mA 500mV~1.8V 74HC Series NAND Gate SOIC-16 Logic Gates ROHSRochester Electronics, LLCLogic Gates
74HC138
SOP-160℃~+70℃ 24ns@5.0V,16pF 2V~6V 3/8 5.2mA 5.2mA 5uA 74HC Decoder Reverse function Single Supply SOP-16 Signal Switches, Multiplexers, Decoders ROHSGRSignal Switches, Multiplexers, Decoders74HC139D
SO-16-40℃~+125℃ 11ns@6.0V,50pF 160uA 2/4 2V~6V 74HC Decoder Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers74HC20D
SOP-14-40℃~+125℃ 1.5V~4.2V 100mV、400mV、400mV 15ns@6V,50pF 2 2V~6V 2uA 4 5.2mA 5.2mA 500mV~1.8V 74HC Series NAND Gate SOP-14 Logic Gates ROHSNexperiaGates74LCX245M
SOIC-20-300milSOIC-20-300mil Specialty Logic ROHSSTMicroelectronicsSpecialty Logic
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETsIRLML6402
SOT-23-55℃~+150℃ 1 P-Channel 1.3W 110pF 12nC 145pF 20V 3.7A 400mV 633pF 65mΩ@4.5V P-Channel SOT-23 MOSFETs ROHSGuangdong HottechMOSFETs
README
Board/Controller/README.md基板設計 for コントローラー
使用ツール
- KiCAD 8
ファイル
I2C_LED_BTN_CH32V.kicad_pro ... プロジェクトファイル for KiCAD
I2C_LED_BTN_CH32V.kicad_sch ... 回路図ファイル for KiCAD
I2C_LED_BTN_CH32V.kicad_pcb ... PCB設計ファイル for KiCAD
*.pretty/ ..................... フットプリントファイル
*.wrl ......................... 3Dモデルファイル(3Dビュー用)
gerber_jlc/ ................... ガーバーファイル for JLCPCBThe Circuit Board Design for Controller
Using Tools
- KiCAD 8
Files
I2C_LED_BTN_CH32V.kicad_pro ... Project file for KiCAD
I2C_LED_BTN_CH32V.kicad_sch ... Schematics file for KiCAD
I2C_LED_BTN_CH32V.kicad_pcb ... PCB design file for KiCAD
*.pretty/ ..................... Footprint files
*.wrl ......................... 3Dmodel file(to use on 3D view)
gerber_jlc/ ................... Gerber files for JLCPCBParts
71| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 47k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R3, R6, R7, R8, R9, R17, R18, R19, R20, R21, R22, R23 |
| 11 | 0.1u | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12 |
| 4 | 4.7k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R2, R4, R5, R12 |
| 4 | LED | LED_THT:LED_D3.0mm | D1, D2, D3, D4 |
| 3 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5, J9, J10 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R13, R14 |
| 2 | 2.2k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R15, R16 |
| 2 | 47p | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C22, C23 |
| 2 | 74HC125 | Package_DIP:DIP-14_W7.62mm_Socket | U8, U10 |
| 2 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J3, J8 |
| 2 | SW_DIP_x04 | Button_Switch_THT:SW_DIP_SPSTx04_Slide_6.7x11.72mm_W7.62mm_P2.54mm_LowProfile | SW2, SW3 |
| 1 | 1000p | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C1 |
| 1 | 100u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C21 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R11 |
| 1 | 150 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R1 |
| 1 | 27C256 | Package_DIP:DIP-28_W15.24mm | U4 |
| 1 | 470k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R10 |
| 1 | 74HC02 | Package_DIP:DIP-14_W7.62mm_Socket | U6 |
| 1 | 74HC08 | Package_DIP:DIP-14_W7.62mm_Socket | U5 |
| 1 | 74HC133 | Package_DIP:DIP-16_W7.62mm_Socket | U12 |
| 1 | 74HC138 | Package_DIP:DIP-16_W7.62mm_Socket | U7 |
| 1 | 74HC139 | Package_DIP:DIP-16_W7.62mm_Socket | U9 |
| 1 | 74HC20 | Package_DIP:DIP-14_W7.62mm_Socket | U11 |
| 1 | 74LCX245 | Package_SO:SSOP-20_4.4x6.5mm_P0.65mm | U2 |
| 1 | 74LCX541 | Package_SO:SSOP-20_4.4x6.5mm_P0.65mm | U3 |
| 1 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | Conn_01x03 | MyFootPrint:YA_JST_XH_S3B-XH-A_1x03_P2.50mm_Horizontal | J7 |
| 1 | Conn_01x04 | MyFootPrint:YA_JST_XH_S4B-XH-A_1x04_P2.50mm_Horizontal | J4 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J6 |
| 1 | Conn_01x05_Pin | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Horizontal | J2 |
| 1 | Conn_02x36_Odd_Even | MyCardEdge:CardEdge72T | Edge1 |
| 1 | IRLML6402 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | PiPico | MyFootPrint:DIP-40_700 | U1 |
| 1 | Polyfuse | MyFootPrint:Fuse_0805_2012Metric_5.08_THT | F1 |
| 1 | SW_RUN | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | USB_A | MyFootPrint:YA_USB_A_Molex_67643_Horizontal | J1 |
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Questions
How big is the S1VirtualFloppy PCB?
It measures 124.5 × 87.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the S1VirtualFloppy use?
71 parts, built around the 74HC125D, 74LCX541WM, 27C256-17/J and 74HC02. 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 S1VirtualFloppy KiCad files?
From the bml3mk5/L3S1VirtualFloppy repository on GitHub, at the commit this page was made from: the board is Board/MBS1/S1VirtualFloppy.kicad_pcb and its schematic Board/BML3/L3VirtualFloppy.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the S1VirtualFloppy design in my own project?
Its repository states no licence, so its author keeps all rights: ask bml3mk5 before reusing the design.