2 layers120.6 × 47 mm
2 layers77.5 × 125 mm
Clocka
rcapaverde/cuboArquitetura de processador conceitual
- Size
- 77.5 × 125 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 62
- Nets
- 80
- Pads
- 290
- Tracks, vias
- 688, 42
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 11 Dec 2025
- Updated
- 24 Aug 2026
Overview
Clocka is an open-source printed circuit board by rcapaverde, from the rcapaverde/cubo repository on GitHub. It is a 2-layer board of 77.5 × 125 mm with 62 parts on 80 nets, routed with 688 tracks and 42 vias.
It is built around the 74LS125DC, NE555P and 74LS74PC, with the 74LS04PC and 74LS86 among its other parts. Its parts include 20 capacitors, 12 resistors, 12 ICs, 12 diodes and 3 connectors.
Main components
574LS125DC
-0℃~+70℃ 1 10ns@5.5V,50pF 15mA 18mA 24mA 4 4.5V~5.5V 74LS Power-off isolation、Output enable Tri-State Unidirectional - Buffers, Drivers, Receivers, TransceiversTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
NE555P
DIP-80℃~+70℃ 100kHz 10mA 4.5V~16V DIP-8 555 Timers / Counters ROHSTexas InstrumentsTimers / Counters
74LS74PC
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 Flops74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters74LS86
DIP-14-20℃~+75℃ 10mA 2.7V 23ns@5V,15pF 2V 400mV 400uA 5V 74LS 800mV 8mA XOR Gate DIP-14 Logic Gates ROHSHITLogic Gates
README
README.mdcubo - um processador conceitual
Parts
62| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | 100nF | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14 |
| 11 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D3, D4, D5, D6, D13, D14, D16, D17, D18, D20 |
| 5 | 10nF | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C21, C22, C23, C24, C27 |
| 5 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R13, R23, R26 |
| 4 | NE555P | Package_DIP:DIP-8_W7.62mm | U8, U9, U11, U12 |
| 3 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7, R18, R24 |
| 3 | 74LS74 | Package_DIP:DIP-14_W7.62mm | U1, U2, U3 |
| 2 | 20K | Potentiometer_THT:Potentiometer_ACP_CA9-H5_Horizontal | RV1, RV3 |
| 2 | 2K2 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R16, R22 |
| 2 | 68K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R14, R27 |
| 2 | 74LS125 | Package_DIP:DIP-14_W7.62mm | U5, U10 |
| 2 | control panel | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J2, J3 |
| 1 | 10uF | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C15 |
| 1 | 74LS04 | Package_DIP:DIP-14_W7.62mm | U4 |
| 1 | 74LS08 | Package_DIP:DIP-14_W7.62mm | U7 |
| 1 | 74LS86 | Package_DIP:DIP-14_W7.62mm | U6 |
| 1 | POWER | LED_THT:LED_D5.0mm | D7 |
| 1 | XTAL1 | Oscillator:Oscillator_DIP-8 | Y1 |
| 1 | bus clock | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J26 |
Questions
How big is the Clocka PCB?
It measures 77.5 × 125 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Clocka use?
62 parts, built around the 74LS125DC, NE555P, 74LS74PC and 74LS04PC. 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 Clocka KiCad files?
From the rcapaverde/cubo repository on GitHub, at the commit this page was made from: the board is pcb_v2/clocka/clocka.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Clocka design in my own project?
Its repository states no licence, so its author keeps all rights: ask rcapaverde before reusing the design.
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