2 layers44.5 × 46.9 mm
OSO SWAT B1-jig
joeycastillo/Sensor-Watch
A board replacement for the classic Casio F-91W wristwatch
31 parts2.1k
2 layers60.5 × 72.9 mm
CmodA7 twtft
oscimp/amaranth_twstft32Software Defined Radio implementation of a Two Way Satellite Time and Frequency Transfer signal
- Size
- 60.5 × 72.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 31
- Nets
- 59
- Pads
- 172
- Tracks, vias
- 126, 47
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 23 Nov 2022
- Updated
- 31 Oct 2026
Overview
CmodA7 twtft is an open-source printed circuit board by oscimp, from the oscimp/amaranth_twstft repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 60.5 × 72.9 mm with 31 parts on 59 nets, routed with 126 tracks and 47 vias.
Its parts include 12 connectors, 7 capacitors, 6 resistors, 3 ICs and 3 inductors. It belongs with the radio and wireless boards of this library.
README
pcb/cmodA7_twtft/README.mdAfter installing amaranth_twstft and associated tools,
source Vivado's setting64.sh and run
./amaranth_twstft/flashZedBoard.py --bitlen 17 --noiselen 1000000 --flashwhere $\log_2(10^5)=16.6\leq 17$ leading to the selection of the 17-bit long GLFSR to generate the 100000 chip long PRN
python3 amaranth_twstft/twstft_config.py -d /dev/ttyUSB1 -l 17 -ta 9 -C OFF -M BPSK
Parts
31| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3, C4, C7, C8 |
| 4 | NC | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7, R8, R9, Rbypass_cmp1 |
| 2 | 10n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C5, C6 |
| 2 | Conn_01x03 | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J3, J4 |
| 2 | Conn_01x24 | Connector_PinSocket_2.54mm:PinSocket_1x24_P2.54mm_Vertical | J1, J2 |
| 2 | L_Iron | Inductor_SMD:L_0805_2012Metric | L1, L2 |
| 1 | 0 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5 |
| 1 | 22u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2 |
| 1 | 51 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | AP2204R-3.3 | Package_TO_SOT_SMD:SOT-89-3 | U4 |
| 1 | Conn_01x01_Pin | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J10 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_2x01_P2.54mm_Vertical | J13 |
| 1 | Conn_01x06 | Connector_PinSocket_2.54mm:PinSocket_1x07_P2.54mm_Vertical | J5 |
| 1 | LTC6957xMS-3 | Package_SO:MSOP-12_3x4.039mm_P0.65mm | U5 |
| 1 | PPS_in | Connector_Coaxial:SMA_Molex_73251-1153_EdgeMount_Horizontal | J7 |
| 1 | clk_in | Connector_Coaxial:SMA_Molex_73251-1153_EdgeMount_Horizontal | J11 |
| 1 | cmp_out | Connector_Coaxial:SMA_Molex_73251-1153_EdgeMount_Horizontal | J12 |
| 1 | enable | Connector_Coaxial:SMA_Molex_73251-1153_EdgeMount_Horizontal | J9 |
| 1 | ferrite bead | Inductor_SMD:L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | L3 |
| 1 | output | Connector_Coaxial:SMA_Molex_73251-1153_EdgeMount_Horizontal | J8 |
| 1 | ~ | twtft:sawtek | U2 |
Questions
How big is the CmodA7 twtft PCB?
It measures 60.5 × 72.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the CmodA7 twtft use?
31 parts. 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 CmodA7 twtft KiCad files?
From the oscimp/amaranth_twstft repository on GitHub, at the commit this page was made from: the board is pcb/cmodA7_twtft/cmodA7_twtft.kicad_pcb and its schematic pcb/cmodA7_twtft/cmodA7_twtft.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the CmodA7 twtft 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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