2 layers99.1 × 99.1 mm
2 layers99.1 × 99.1 mm
Sequencer
ksmonkey123/8bit_computer1custom 8bit microprocessor project
- Size
- 99.1 × 99.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 25
- Nets
- 80
- Pads
- 273
- Tracks, vias
- 658, 29
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 10 Dec 2024
- Updated
- 9 Sep 2026
Overview
Sequencer is an open-source printed circuit board by ksmonkey123, from the ksmonkey123/8bit_computer repository on GitHub, published under the MIT licence. It is a 2-layer board of 99.1 × 99.1 mm with 25 parts on 80 nets, routed with 658 tracks and 29 vias.
It is built around the 74HC273D and 74HC74D. Its parts include 11 ICs, 5 capacitors, 1 resistor and 1 connector.
Main components
2
74HC273D
SOIC-20-300mil-40℃~+125℃ 1 12ns 15ns@4.5V,50pF 2V~6V 3.5pF 30MHz 3ns 74HC Series 8 8uA D-Type Reset Rising Edge SO-20-300mil Flip Flops ROHSNexperiaFlip Flops
74HC74D
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 Flops
Parts
25| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | C | Capacitor_SMD:C_0603_1608Metric | C2, C3, C4, C5 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4 |
| 3 | 74HC273 | Package_DIP:DIP-20_W7.62mm | U1, U2, U3 |
| 3 | Conn_01x16 | Connector_IDC:IDC-Header_2x08_P2.54mm_Horizontal | BACKPLANE1, BACKPLANE2, INTCON_D1 |
| 2 | 4011 | Package_DIP:DIP-14_W7.62mm | U9, U11 |
| 2 | 4081 | Package_DIP:DIP-14_W7.62mm | U5, U7 |
| 1 | 4071 | Package_DIP:DIP-14_W7.62mm | U6 |
| 1 | 4078 | Package_DIP:DIP-14_W7.62mm | U8 |
| 1 | 74HC74 | Package_DIP:DIP-14_W7.62mm | U10 |
| 1 | 74LS283 | Package_DIP:DIP-16_W7.62mm | U4 |
| 1 | C_Polarized | Capacitor_SMD:CP_Elec_5x5.3 | C1 |
| 1 | R | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | Screw_Terminal_01x03 | TerminalBlock:TerminalBlock_Xinya_XY308-2.54-3P_1x03_P2.54mm_Horizontal | J1 |
Questions
How big is the Sequencer PCB?
It measures 99.1 × 99.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Sequencer use?
25 parts, built around the 74HC273D and 74HC74D. 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 Sequencer KiCad files?
From the ksmonkey123/8bit_computer repository on GitHub, at the commit this page was made from: the board is circuits/pc-12_sequencer/sequencer.kicad_pcb and its schematic circuits/pc-01_dual_8bit_register/dual_8bit_register.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sequencer design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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