4 layers62.8 × 97.5 mm
2 layers125 × 102.5 mm
Reloj
alvarop/reloj27This project was inspired by my dad's university digital systems project from the late 1970's. I found the writeup and schematic and decided to try and re-create it.
- Size
- 125 × 102.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 88
- Nets
- 147
- Pads
- 433
- Tracks, vias
- 697, 28
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 23 Mar 2020
- Updated
- 23 Nov 2020
Overview
Reloj is an open-source printed circuit board by alvarop, from the alvarop/reloj repository on GitHub. It is a 2-layer board of 125 × 102.5 mm with 88 parts on 147 nets, routed with 697 tracks and 28 vias.
It is built around the CD4060BM. Its parts include 35 resistors, 22 ICs, 20 capacitors, 2 connectors and 2 switches.
Main components
1README
README.mdReloj - 7400 Series Digital Clock
This project was inspired by my dad's university digital systems project from the late 1970's. I found the writeup and schematic and decided to try and re-create it. You can see the results of the breadboard reproduction and explanations in this twitter thread.
After a while, I figured it would be fun to make a soldering kit out of it, which resulted in this.
The design is fairly close to the original, but with the addition of a crystal-backed alternate clock source. The 555 timer clock source works, but drifts like crazy, so if you want to use it as an actual clock, you still can with the alt source.
If you want to take a look at the actual paper, you can see the scanned version here.
Design Files
You can get the latest files in the github releases.
For v1.2, you can use my OSHPark shared project or by grabbing the gerbers from the release.
Assembly Instructions
You can find semi-detailed assembly instructions here.
Parts
88| Qty | Value | Footprint | References |
|---|---|---|---|
| 28 | 1k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25 +12 |
| 17 | 0.1u | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C1, C2, C3, C4, C5, C6, C7, C11, C12, C13, C14, C15, C16, C17, C18, C21 +1 |
| 9 | 74LS90 | Package_DIP:DIP-14_W7.62mm | U2, U3, U4, U5, U7, U8, U10, U12, U14 |
| 5 | 330 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R4, R5, R6, R7 |
| 4 | 74LS47 | Package_DIP:DIP-16_W7.62mm | U15, U16, U17, U18 |
| 4 | SA04-11SRWA | alvarop:SA04-11SRWA | U19, U20, U21, U22 |
| 2 | 22pf | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C9, C10 |
| 2 | 74LS92 | Package_DIP:DIP-14_W7.62mm | U9, U11 |
| 2 | SW_Push | alvarop:TE_1825910-6 | SW1, SW2 |
| 1 | 15M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 1k | ultra_librarian:3296Y-1-102LF | RV1 |
| 1 | 32768Hz | alvarop:CFS-206x | Y1 |
| 1 | 330k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R3 |
| 1 | 4.7uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C22 |
| 1 | 74LS08 | Package_DIP:DIP-14_W7.62mm | U13 |
| 1 | CD4060B | Package_DIP:DIP-16_W7.62mm | U6 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | LM555 | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | USB_B_Mini | alvarop:TE_2172034-1 | J2 |
The 83 most common of 88 parts.
Questions
How big is the Reloj PCB?
It measures 125 × 102.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Reloj use?
88 parts, built around the CD4060BM. 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 Reloj KiCad files?
From the alvarop/reloj repository on GitHub, at the commit this page was made from: the board is reloj.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Reloj design in my own project?
Its repository states no licence, so its author keeps all rights: ask alvarop before reusing the design.
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