2 layers158.4 × 41.7 mm SMDModelF, the printed circuit board in 3D

SMDModelF

Model F controller, supports F AT, F122, F Unsaver, and "Blue Switch" keyboards.

Size: 158.4 × 41.7 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 45
Nets: 59
Pads: 233
Tracks, vias: 664, 539
Pours: 2
Routed: Yes
KiCad: KiCad 5 (file 20171130)
Created: 30 Sep 2020
Updated: 15 Sep 2022

Overview

SMDModelF is an open-source printed circuit board by purdeaandrei, from the purdeaandrei/SMDModelFController repository on GitHub. It is a 2-layer board of 158.4 × 41.7 mm with 45 parts on 59 nets, routed with 664 tracks and 539 vias.

It is built around the MCP4921-E/P, 74AHC595D and LM339AD. Its parts include 19 resistors, 6 capacitors, 6 ICs and 5 connectors. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.

Main components

README

README.md

SMD Model F controller based on TH Xwhatsit design. ('standard' variant)

This variant is for 'standard' model F keyboards, including FAT, F122, ...

For other variants see:

Images

Top of the controller board Bottom of the controller board

Origins and license

This project is based on the Through-hole xwhatsit by listofoptions, which is un turn based on the capsense controllers by XWhatsIt (Tom Wong-Cornall). original liscencure holds, as well as CERN OSH (compatible license).

original implementation of Tom Wong-Cornall's controller documented here

http://downloads.cornall.co/ibm-capsense-usb-web/ibm-capsense-usb.html

Working theory of operation is under the previous link.

Parts

Qty	Value	Footprint	References
8	100k 1%	Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R9, R10, R11, R12, R13, R14, R15, R16
6	0U1	Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder	C1, C2, C3, C4, C6, C7
3	330	Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R17, R18, R19
3	Not Mounted	Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R6, R7, R8
3	SMTAssemblyToolingHole	TH-XWhatsIt:tooling_hole	H4, H5, H6
2	20K	Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R3, R4
2	4K7	Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R1, R5
2	74AHC595	Package_SO:SOIC-16_3.9x9.9mm_P1.27mm	U3, U4
2	LM339A	Package_SO:SOIC-14_3.9x8.7mm_P1.27mm	U2, U6
1	1K	Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R2
1	3178 Ribbon Cable	TH-XWhatsIt:Model_F_3.96mm_pitch_footprint	J4
1	Dac Output	TestPoint:TestPoint_Pad_D1.0mm	TP1
1	EXPANSION HEADER	TH-XWhatsIt:PinHeader_2x03_P2.54mm_Vertical_3dhorizontal	J3
1	MCP4921-E	Package_SO:SOIC-8_3.9x4.9mm_P1.27mm	U1
1	MODEL F AT LOCKLIGHTS HEADER	TH-XWhatsIt:FAT_LockLightsConnector	J6
1	Model F Ribbon Cable	TH-XWhatsIt:Model_F_3.96mm_pitch_footprint	J1
1	MountingHole_Pad	TH-XWhatsIt:ModelF_new_mounting_hole_right	H2
1	MountingHole_Pad	TH-XWhatsIt:ModelF_new_mounting_hole_left	H1
1	MountingHole_Pad	TH-XWhatsIt:ChassisGnd	H3
1	Net-Tie_4_Cross	NetTie:NetTie-4_THT_Pad1.0mm	NT1
1	PadsToShort	TH-XWhatsIt:PadsToShort	J2
1	ProMicro	promicro:ProMicro	U5
1	Threshold Voltage	TestPoint:TestPoint_Pad_D1.0mm	TP2

Questions

How big is the SMDModelF PCB?

It measures 158.4 × 41.7 mm and has 2 copper layers, 1.6 mm thick.

What parts does the SMDModelF use?

45 parts, built around the MCP4921-E/P, 74AHC595D and LM339AD. 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 SMDModelF KiCad files?

From the purdeaandrei/SMDModelFController repository on GitHub, at the commit this page was made from: the board is SMDModelF/SMDModelF.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the SMDModelF design in my own project?

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

Category and platform

Keyboards and input AVR (ATmega, ATtiny)

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/purdeaandrei-smdmodelfcontroller" title="SMDModelF in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/purdeaandrei-smdmodelfcontroller.jpg" alt="SMDModelF" width="1200" height="900">

A picture that opens the board, for a README

[![SMDModelF](https://pcbkit.io/embed/boards/purdeaandrei-smdmodelfcontroller.jpg?size=s)](https://pcbkit.io/boards/purdeaandrei-smdmodelfcontroller)

Source

Repository: purdeaandrei/SMDModelFController
Board file: SMDModelF/SMDModelF.kicad_pcb
Commit: 8c744cf
Licence: Not stated

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