2 layers
Ya4b alu
lafehubert/electronics
A place for info and code relating to my electronics projects
133 parts
2 layers99.5 × 49.7 mm
Transfer register board
lafehubert/electronicsA place for info and code relating to my electronics projects
- Size
- 99.5 × 49.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 40
- Nets
- 75
- Pads
- 233
- Tracks, vias
- 779, 42
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 19 Oct 2019
- Updated
- 8 Jan 2022
Overview
Transfer register board is an open-source printed circuit board by lafehubert, from the lafehubert/electronics repository on GitHub. It is a 2-layer board of 99.5 × 49.7 mm with 40 parts on 75 nets, routed with 779 tracks and 42 vias.
It is built around the 74LS157PC, 74LS173SC and SN74LS04N. Its parts include 15 diodes, 8 capacitors, 8 ICs, 7 resistors and 1 connector.
Main components
3
74LS157PC
PDIP-160℃~+70℃ 4.75V~5.25V Single Supply PDIP-16 Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders74LS173SC
CDIP-160℃~+70℃ 10ns 10ns 28mA 30MHz 4 4.75V~5.25V 40ns@5V,15pF 74LS Series Asynchronous D-Type Reset Rising Edge Tri-State CDIP-16 Flip FlopsTexas InstrumentsFlip Flops
SN74LS04N
PDIP-140℃~+70℃ 1 15ns@5V,15pF 2.7V~3.4V 2V 4.75V~5.25V 400uA 500mV 6 74LS 800mV 8mA PDIP-14 Inverters ROHSTexas InstrumentsInverters
README
ya4b/slow-clock/README.mdThis slow clock was initially inspired by Ben Eater's design (https://eater.net/8bit/clock) but I found the 555 to be too fiddly for the monostable stage, and overkill for the bistable stage, so I used a 74LS123 for the former and an R-S latch made from a couple of NANDs on a 74LS00 for the latter. I also replaced the 74LS04 with a 74LS14 which seemed to clean up the waveform a good bit.
Parts
40| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | LED | LED_THT:LED_Rectangular_W5.0mm_H2.0mm | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15 |
| 8 | 0.1µF | Capacitor_THT:C_Disc_D3.4mm_W2.1mm_P2.50mm | C1, C2, C3, C4, C5, C6, C7, C8 |
| 7 | 470Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3, R4, R5, R6, R7 |
| 2 | 74LS157 | Package_DIP:DIP-16_W7.62mm_Socket | U1, U2 |
| 2 | 74LS173 | Package_DIP:DIP-16_W7.62mm_Socket | U3, U4 |
| 2 | 74LS243 | Package_DIP:DIP-14_W7.62mm_Socket | U5, U6 |
| 1 | 470Ω | Resistor_THT:R_Array_SIP9 | RN1 |
| 1 | 74LS541 | Package_DIP:DIP-20_W7.62mm_Socket | U7 |
| 1 | Conn_01x38 | Connector_PinHeader_2.54mm:PinHeader_1x38_P2.54mm_Vertical | J1 |
| 1 | SN74LS04N | Package_DIP:DIP-14_W7.62mm_Socket | U8 |
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Questions
How big is the Transfer register board PCB?
It measures 99.5 × 49.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Transfer register board use?
40 parts, built around the 74LS157PC, 74LS173SC and SN74LS04N. 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 Transfer register board KiCad files?
From the lafehubert/electronics repository on GitHub, at the commit this page was made from: the board is ya4b/transfer-register/transfer-register-board/transfer-register-board.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Transfer register board design in my own project?
Its repository states no licence, so its author keeps all rights: ask lafehubert before reusing the design.