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Diffpair test

rjwalters·kicad-tools·boards/06-diffpair-test/output/diffpair_test.kicad_pcb

Top view of the Diffpair test PCB
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Diffpair test is an open source PCB design by rjwalters: a 4-layer, 90 × 70 mm board with 36 components (10 distinct parts). It is built around the SN65LVDS1DR, SN65LVDS2DR.

Standalone Python tools for parsing and manipulating KiCad schematic and PCB files

Four real SN65LVDS1 drivers send LVTTL header inputs over terminated LVDS pairs to SN65LVDS2 receivers and output headers. The board uses an explicitly reviewed four-layer JLC7628 construction, length-matched differential pairs, and ordinary through vias outside SMT lands.

See the assembled design guide for exact components, source regeneration, routing checks, fabrication settings and bench bring-up. The complete fabrication/assembly download is output/manufacturing.zip; current readiness is recorded in output/readiness.json. Three Samtec headers require manual through-hole assembly. No…

Built around

SN65LVDS1DRSN65LVDS2DR

Parts list

36 components, 10 distinct parts — part numbers from the project's BOM.

QtyPartRefs
4
SN65LVDS1DR
U1, U3, U5, U7
4
SN65LVDS2DR
U2, U4, U6, U8
1
3.3V regulated input
J1
1
IN1-4 / GND
J2
1
OUT1-4 / GND
J3
8
1NF
1nF
C1, C3, C5, C7, C9, C11, C13, C15
8
100NF
100nF
C2, C4, C6, C8, C10, C12, C14, C16
1
10UF
10uF
C17
4
100
R1, R2, R3, R4
4
100K
100k
R5, R6, R7, R8

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