2 layers300 × 200.3 mm
Carbon Z80
Julesc013/project-carbon
Hardware and software for custom CPUs, FPUs, and computer systems.
327 parts
2 layers300 × 200 mm
Model 150
Julesc013/project-carbonHardware and software for custom CPUs, FPUs, and computer systems.
- Size
- 300 × 200 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 377
- Nets
- 495
- Pads
- 2,143
- Tracks, vias
- 1,128, 0
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 3 Aug 2025
- Updated
- 18 Sep 2026
Overview
Model 150 is an open-source printed circuit board by Julesc013, from the Julesc013/project-carbon repository on GitHub. It is a 2-layer board of 300 × 200 mm with 377 parts on 495 nets, routed with 1,128 tracks and 0 vias.
It is built around the A13, 74AHCT125D and MAX232N, with the 74LS00SC, 74HCT138D and 74HCT273D among its other parts. Its parts include 58 resistors, 43 capacitors, 37 ICs and 5 diodes.
Main components
12A13
TQFP-176(20x20)TQFP-176(20x20) Microcontrollers (MCU/MPU/SOC) ROHSAllwinner TechMicrocontroller Units (MCUs/MPUs/SOCs)
74AHCT125D
SOP-14-40℃~+125℃ 1 4 4.3ns@5V,50pF 4.5V~5.5V 40uA 74AHCT 8mA 8mA Schmitt trigger Tri-State Unidirectional SOP-14 Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffer/Driver/Transceiver
MAX232N
PDIP-160℃~+70℃ 120Kbps 2 2 4.5V~5.5V Transceiver PDIP-16 RS232 ICs ROHSTexas InstrumentsRS232 ICs
74LS00SC
-0℃~+70℃ 15ns@5V,50pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA NAND Gate - Logic Gates ROHSTexas InstrumentsLogic Gates
74HCT138D
SO-16-40℃~+125℃ 160uA 20ns@4.5V,50pF 3/8 4.5V~5.5V 4mA 4mA 74HCT Decoder Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers
74HCT273D
SOIC-20-300mil-40℃~+125℃ 12ns 3.5pF 30ns@4.5V,50pF 36MHz 3ns 4.5V~5.5V 4mA 5.2mA 74HCT Series 8 8uA D-Type Reset Rising Edge SOIC-20-300mil Flip Flops ROHSNexperiaFlip Flops
74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters
74LS161DC
-0℃~+70℃ 14ns 32MHz 4 4.75V~5.25V 74LS 93mW Asynchronous Binary Counter Programmable divide ratio、Reset function、Cascade counter、Synchronous counting Rising Edge Synchronous - Counters, DividersTexas InstrumentsCounters, Dividers
74LS32SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates74LS74PC
DIP-140ns 0℃~+70℃ 1 2 20MHz 3.5pF 35ns@5V,50pF 4.5ns 4.75V~5.25V 400uA 74LS Series 8mA 8mA Asynchronous Complementary D-Type Rising Edge Set and Reset DIP-14 Flip FlopsTexas InstrumentsFlip Flops74HCT139D
SO-16-40℃~+125℃ 160uA 16ns@4.5V,50pF 4.5V~5.5V 4/8 4mA 4mA 74HCT Decoder Single Supply SO-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches, Multiplexers, Decoders74HCT157D
SO-16-40℃~+125℃ 160uA 16ns@4.5V,50pF 4.5V~5.5V 4mA 4mA 74HCT 8/4 Multiplexer Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches, Multiplexers, Decoders
README
schem/Model_150/README.mdModel: 150 Family: Carbon Processor: Z80
Parts
377| Qty | Value | Footprint | References |
|---|---|---|---|
| 27 | 100nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C2, C15, C16, C17, C18, C19, C20, C21, C22, C23, C25, C26, C28, C29, C30, C34 +11 |
| 14 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R17, R19, R20, R21, R22, R27, R28, R33, R34, R35, R50, R66, R67, R69 |
| 10 | HOLE | , , , , , , , , , | |
| 9 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R4, R5, R6, R16, R37, R44, R52, R54 |
| 9 | 2K2 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R23, R24, R25, R26, R29, R30, R31, R32, R64 |
| 8 | , , , , , , , | ||
| 8 | 1uF | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C7, C8, C9, C10, C11, C12, C13, C14 |
| 8 | 220R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7, R8, R9, R10, R11, R12, R13, R14 |
| 6 | 4K7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R15, R18, R38, R39, R40, R41 |
| 6 | JC64 | Carboni_Library:JC64_Bus_8b | JCBUS_1, JCBUS_2, JCBUS_3, JCBUS_4, JCBUS_5, JCBUS_6 |
| 5 | GND | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP1, TP1, TP1, TP1, TP1 |
| 4 | 74LS00 | Package_DIP:DIP-14_W7.62mm | U0, U12, U17, U40 |
| 3 | 120pF | Capacitor_THT:C_Disc_D3.4mm_W2.1mm_P2.50mm | C1, C24, C27 |
| 3 | 74AHCT125 | Package_DIP:DIP-14_W7.62mm | U3, U18, U26 |
| 3 | 74HCT138 | Package_DIP:DIP-16_W7.62mm | U8, U20, U29 |
| 3 | 74HCT273 | Package_DIP:DIP-20_W7.62mm | U6, U9, U24 |
| 3 | 74LS04 | Package_DIP:DIP-14_W7.62mm | U1, U19, U28 |
| 3 | 74LS161 | Package_DIP:DIP-16_W7.62mm | U16, U39, U41 |
| 2 | +12V | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP3, TP3 |
| 2 | +3.3V | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP6, TP6 |
| 2 | +5V | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP2, TP2 |
| 2 | -12V | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP5, TP5 |
| 2 | 100pF | Capacitor_THT:C_Disc_D3.4mm_W2.1mm_P2.50mm | C35, C36 |
| 2 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R36, R42 |
| 2 | 390K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R70, R72 |
| 2 | 5K6 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R60, R63 |
| 2 | 74LS32 | Package_DIP:DIP-14_W7.62mm | U14, U23 |
| 2 | 74LS74 | Package_DIP:DIP-14_W7.62mm | U21, U42 |
| 2 | BUSACK | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP23, TP23 |
| 2 | BUSREQ | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP22, TP22 |
| 2 | CLK | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP9, TP9 |
| 2 | CLK2 | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP10, TP10 |
| 2 | DE9_Pins | Connector_Dsub:DSUB-9_Pins_Horizontal_P2.77x2.84mm_EdgePinOffset7.70mm_Housed_MountingHolesOffset9.12mm | SERIAL_0, SERIAL_1 |
| 2 | IDT6116 | Package_DIP:DIP-24_W15.24mm_Socket | RAM_1, RAM_2 |
| 2 | MAX232 | Package_DIP:DIP-16_W7.62mm_Socket | U10, U11 |
| 2 | RESET | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP21, TP125 |
| 2 | TAPE_RC | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP115, TP120 |
| 2 | W27C512 | Package_DIP:DIP-28_W15.24mm_Socket | ROM_0, ROM_1 |
| 1 | +12V | LED_THT:LED_D5.0mm | D5 |
| 1 | +5V | LED_THT:LED_D5.0mm | D4 |
| 1 | -12V | LED_THT:LED_D5.0mm | D6 |
| 1 | -5V | LED_THT:LED_D5.0mm | D8 |
| 1 | -5V | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP4 |
| 1 | 10K | Resistor_THT:R_Array_SIP9 | RN2 |
| 1 | 1K | Resistor_THT:R_Array_SIP9 | RN1 |
| 1 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R68 |
| 1 | 1nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C3 |
| 1 | 2.2uF | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C37 |
| 1 | 20K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R65 |
| 1 | 22K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R71 |
| 1 | 22nF | Capacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mm | C31 |
| 1 | 3.3V | LED_THT:LED_D5.0mm | D7 |
| 1 | 330R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R53 |
| 1 | 4046 | Package_DIP:DIP-16_W7.62mm_Socket | U43 |
| 1 | 4049UB | Package_DIP:DIP-16_W7.62mm | U33 |
| 1 | 4070 | Package_DIP:DIP-14_W7.62mm | U38 |
| 1 | 560R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R61 |
| 1 | 56K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R62 |
| 1 | 74HCT139 | Package_DIP:DIP-16_W7.62mm | U4 |
| 1 | 74HCT157 | Package_DIP:DIP-16_W7.62mm | U7 |
| 1 | 74HCT688 | Package_DIP:DIP-20_W7.62mm | U5 |
| 1 | 74HCT74 | Package_DIP:DIP-14_W7.62mm | U13 |
| 1 | 74LS02 | Package_DIP:DIP-14_W7.62mm | U15 |
| 1 | 74LS08 | Package_DIP:DIP-14_W7.62mm | U30 |
| 1 | 74LS139 | Package_DIP:DIP-16_W7.62mm | U22 |
| 1 | 74LS76 | Package_DIP:DIP-16_W7.62mm | U34 |
| 1 | 82C55A | Package_DIP:DIP-40_W15.24mm_Socket | U27 |
| 1 | A0 | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP50 |
| 1 | A1 | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP51 |
| 1 | A10 | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP60 |
| 1 | A11 | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP61 |
| 1 | A12 | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP62 |
| 1 | A13 | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP63 |
| 1 | A14 | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP64 |
| 1 | A15 | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP65 |
| 1 | A16 | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP66 |
| 1 | A17 | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP67 |
| 1 | A18 | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP68 |
| 1 | A19 | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP69 |
| 1 | A2 | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP52 |
The 214 most common of 377 parts.
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Questions
How big is the Model 150 PCB?
It measures 300 × 200 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Model 150 use?
377 parts, built around the A13, 74AHCT125D, MAX232N and 74LS00SC. 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 Model 150 KiCad files?
From the Julesc013/project-carbon repository on GitHub, at the commit this page was made from: the board is schem/Model_150/Model_150.kicad_pcb and its schematic schem/Model_150/Model_150.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Model 150 design in my own project?
Its repository states no licence, so its author keeps all rights: ask Julesc013 before reusing the design.