2 layers74.5 × 56.3 mm
PowerBook
BlueSCSI/BlueSCSI-v2
BlueSCSI v2/Ultra - an open source, open hardware, SCSI emulator using the Pi Pico PR2040 and Pico 2 RP2350
83 parts459GPL-3.0
2 layers89.2 × 82.6 mm
Desktop 50 Pin TopConn
BlueSCSI/BlueSCSI-v2459BlueSCSI v2/Ultra - an open source, open hardware, SCSI emulator using the Pi Pico PR2040 and Pico 2 RP2350
- Size
- 89.2 × 82.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 108
- Nets
- 134
- Pads
- 507
- Tracks, vias
- 1,615, 217
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 25 Jan 2023
- Updated
- 11 Oct 2026
Overview
Desktop 50 Pin TopConn is an open-source printed circuit board by BlueSCSI, from the BlueSCSI/BlueSCSI-v2 repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 89.2 × 82.6 mm with 108 parts on 134 nets, routed with 1,615 tracks and 217 vias.
It is built around the 74HC14, AMS1117-2.85 and AO3401A, with the SM04B-SRSS-TB(LF)(SN) among its other parts. Its parts include 46 resistors, 24 capacitors, 10 ICs, 10 connectors and 4 diodes. It belongs with the RP2040 boards of this library.
Main components
4
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
AMS1117-2.85
SOT-223-40℃~+125℃@(Tj) 0.003%Vout 1 1.3V@(1A) 12V 1A 2.85V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
AO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
SM04B-SRSS-TB(LF)(SN)
SMD,P=1mm,卧贴-25℃~+85℃ 1 1A 1mm 1x4P 2.9mm 4 4.32mm 4P 50V 6mm Auxiliary Solder Pin Copper alloy PA SH Surface Mount, Right Angle Tin UL94V-0 White SMD,P=1mm,卧贴 Wire To Board Connector ROHSJSTWire To Board Connector
Parts
108| Qty | Value | Footprint | References |
|---|---|---|---|
| 18 | 110 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2, R3, R4, R5, R6, R7, R10, R33, R34, R35, R36, R37, R38, R39, R40 +2 |
| 10 | 1k | Resistor_SMD:R_0402_1005Metric | R11, R25, R28, R29, R61, R65, R66, R67, R68, R69 |
| 9 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C8, C9, C11, C13, C14, C19, C20, C22, C24 |
| 9 | 1k | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R12, R13, R14, R15, R16, R17, R18, R19, R42 |
| 4 | 4.7k | Resistor_SMD:R_0603_1608Metric | R22, R23, R24, R26 |
| 4 | 4.7uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C10, C15, C16, C21 |
| 4 | LVT125 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U13, U14, U15, U16 |
| 4 | LVT245 | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U4, U5, U6, U9 |
| 3 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1, C2, C5 |
| 3 | 4.7uF | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C6, C7, C12 |
| 3 | Conn_01x03_Male | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1, J5, J10 |
| 3 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3 |
| 2 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C17, C18 |
| 2 | 20uF | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C3, C4 |
| 2 | 4.7k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R41, R56 |
| 2 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 2 | D | Diode_SMD:D_SMA | D1, D2 |
| 2 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D3, D4 |
| 2 | LOGO | LOGO | G***, G*** |
| 2 | Polyfuse | Fuse:Fuse_0805_2012Metric_Pad1.15x1.40mm_HandSolder | F2, F3 |
| 2 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP2 |
| 1 | 150 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R58 |
| 1 | 20uF | Capacitor_SMD:C_1206_3216Metric | C23 |
| 1 | 330 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R59 |
| 1 | 470 | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R30 |
| 1 | 74HC14 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U8 |
| 1 | ACK_En | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J11 |
| 1 | AMS1117-2.85 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U3 |
| 1 | BergFloppy | CustomFootprints:BergFloppy_RightAngle | J3 |
| 1 | Conn_01x02_Male | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J9 |
| 1 | Conn_02x25_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x25_P2.54mm_Horizontal | J2 |
| 1 | EPWR | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J8 |
| 1 | PicoWModule | Library:Raspberry_Pi_PicoW_SMT_THT | RP1 |
| 1 | SM04B-SRSS-TB(LF)(SN) | Library:JST_SM04B-SRSS-TB(LF)(SN) | J6 |
| 1 | SOFNG_SD-001 | CustomFootprints:SOFNG_SD-001 | SD1 |
| 1 | SW_MEC_5E | Library:TS-1187A-B-A-B | SW1 |
| 1 | TERM_BCKF | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J7 |
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Questions
How big is the Desktop 50 Pin TopConn PCB?
It measures 89.2 × 82.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Desktop 50 Pin TopConn use?
108 parts, built around the 74HC14, AMS1117-2.85, AO3401A and SM04B-SRSS-TB(LF)(SN). 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 Desktop 50 Pin TopConn KiCad files?
From the BlueSCSI/BlueSCSI-v2 repository on GitHub, at the commit this page was made from: the board is hardware/Desktop_50_Pin/Desktop_50_Pin_TopConn.kicad_pcb and its schematic hardware/Centronics_50Pin/Centronics_50Pin.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Desktop 50 Pin TopConn design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).