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2 layersSignalbuffer, the printed circuit board in 3D

Signalbuffer

androiders/pcbs

Rpo for pcb layouts, gerber and gcode files

Full screenGitHub.kicad_pcb
Copper layers
2
Thickness
1.6 mm
Parts
28
Nets
21
Pads
59
Tracks, vias
73, 0
Routed
Yes
KiCad
KiCad 4
Created
18 Jun 2018
Updated
30 Aug 2022

Overview

Signalbuffer is an open-source printed circuit board by androiders, from the androiders/pcbs repository on GitHub. It is a 2-layer board with 28 parts on 21 nets, routed with 73 tracks and 0 vias.

It is built around the LM318N. Its parts include 12 connectors, 10 resistors, 4 capacitors and 2 ICs.

Main components

1

README

README.md

View this project on CADLAB.io.

pcbs

Repo for pcb layouts, gerber and gcode files

Ki-Cad

PCB layout:

  • Use as wide traces as possible. 1mm preffered.
  • Dont use "filled areas" if possible. It does not make good geometry in flatcam
  • Don't forget to set origin marker
  • Export gerber: use auxiliary axis

FlatCam

geometry generation:

  • If you are using thru-hole components or using bottom layer, mirror around y axis for both geometry and Drilling
  • Edit drill files if necessary for fewer drill sizes
  • TODO: test double sided layout by mirroring around center axis!

Isolation generation:

  • Current isolation mill depth to test: 0.04 mm (0.05 was tested and seems to work fine!) (Common copper depth is about 0.03 mm)

  • Current feedrate on isolation milling to test: 60 mm/s

  • spindle speed 12000 rpm

  • use 0.2 mm tool width on cnc generation

  • 2 passes with 0.1 overlap

Cutout generation:

  • Current cutout mill depth: 1.6 mm
  • Current feedrate on cutout milling: 40 mm/s
  • spindle speed 12000 rpm

FlatCam defaults:

  • put a link in ~/.FlatCAM/defaults.json

bCNC

Probe:

  • Fastfeed: 120
  • Probefeed: 25
  • Probe points: 4/cm (in each direction)

Drilling:

  • Current drill plunge rate to test 20 mm/s
  • spindle speed: 12000 rpm
  • Drill depth: 1.6

Parts

28
QtyValueFootprintReferences
10RResistors_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_VerticalR1, R2, R3, R4, R5, R6, R7, R8, R9, R10
247uFCapacitors_THT:CP_Radial_D5.0mm_P2.00mmC3, C4
2CPCapacitors_THT:CP_Radial_D5.0mm_P2.50mmC1, C2
115v inputPin_Headers:Pin_Header_Angled_1x03_Pitch2.54mmJ1
1Bias1 InPin_Headers:Pin_Header_Straight_1x01_Pitch2.54mmJ7
1Bias1 PosPin_Headers:Pin_Header_Straight_1x01_Pitch2.54mmJ4
1Bias1 negPin_Headers:Pin_Header_Straight_1x01_Pitch2.54mmJ2
1Bias2 InPin_Headers:Pin_Header_Straight_1x01_Pitch2.54mmJ8
1Bias2 PosPin_Headers:Pin_Header_Straight_1x01_Pitch2.54mmJ5
1Bias2 negPin_Headers:Pin_Header_Straight_1x01_Pitch2.54mmJ3
1LM318NHousings_DIP:DIP-8_W7.62mmU2
1LM318NHousings_DIP:DIP-8_W7.62mm_LongPadsU1
1SIN/TRI outPin_Headers:Pin_Header_Straight_1x01_Pitch2.54mmJ12
1SQR outPin_Headers:Pin_Header_Straight_1x01_Pitch2.54mmJ9
1Signal SIN InPin_Headers:Pin_Header_Straight_1x01_Pitch2.54mmJ11
1Signal SQR InPin_Headers:Pin_Header_Straight_1x01_Pitch2.54mmJ6
1Signals GndPin_Headers:Pin_Header_Straight_1x02_Pitch2.54mmJ10

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Questions

What parts does the Signalbuffer use?

28 parts, built around the LM318N. 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 Signalbuffer KiCad files?

From the androiders/pcbs repository on GitHub, at the commit this page was made from: the board is signalbuffer_single/signalbuffer.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Signalbuffer design in my own project?

Its repository states no licence, so its author keeps all rights: ask androiders before reusing the design.