2 layers180 × 65 mm
2 layers50.8 × 38.4 mm
first pcb
- Size
- 50.8 × 38.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 21
- Pads
- 75
- Tracks, vias
- 159, 50
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 21 Jul 2023
- Updated
- 10 Aug 2023
Overview
LFSR is an open-source printed circuit board by srosebed, from the srosebed/first-pcb repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 50.8 × 38.4 mm with 21 parts on 21 nets, routed with 159 tracks and 50 vias.
It is built around the 74HC86D, 74LS174DC and NE555D. Its parts include 7 resistors, 6 capacitors, 4 diodes, 3 ICs and 1 connector.
Main components
3
74HC86D
SO-14-40℃~+125℃ 1.5V~4.2V 20ns@6V,50pF 2V~6V 2uA 4 5.2mA 5.2mA 500mV~1.8V 74HC Series XOR Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates
74LS174DC
-0ns 0℃~+70℃ 1 16mA 20ns 30MHz 30ns@5V,15pF 4.75V~5.25V 400uA 6 74LS Series 8mA Asynchronous Push-Pull Reset Rising Edge - Flip Flops ROHSonsemiFlip Flops
NE555D
SOIC-80℃~+70℃ 10mA 4.5V~16V SOIC-8 555 Timers / Counters ROHSTexas InstrumentsTimers / Counters
Parts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10k | Resistor_SMD:R_1206_3216Metric | R2, R5, R6, R7, R8 |
| 4 | red | Diode_SMD:D_1206_3216Metric | D1, D2, D3, D4 |
| 3 | 100n | Capacitor_SMD:C_1206_3216Metric | C3, C4, C6 |
| 2 | 1M | Resistor_SMD:R_1206_3216Metric | R3, R4 |
| 1 | 1.5n | Capacitor_SMD:C_1206_3216Metric | C2 |
| 1 | 10n | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1 |
| 1 | 10u | Capacitor_SMD:C_1206_3216Metric | C5 |
| 1 | 74HC86 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U3 |
| 1 | 74LS174 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U2 |
| 1 | Barrel_Jack | Connector_BarrelJack:BarrelJack_Wuerth_6941xx301002 | J1 |
| 1 | NE555D | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
Questions
How big is the LFSR PCB?
It measures 50.8 × 38.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the LFSR use?
21 parts, built around the 74HC86D, 74LS174DC and NE555D. 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 LFSR KiCad files?
From the srosebed/first-pcb repository on GitHub, at the commit this page was made from: the board is LFSR.kicad_pcb and its schematic LFSR.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LFSR design in my own project?
Its repository publishes it under the GPL-3.0 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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