HardLabs

MicroSwitch-SD-E

JuergenLeber·MicroSwitch-SD-E

MicroSwitch-SD-E PCB layout, top view — open source board by JuergenLeber

About the MicroSwitch-SD-E PCB

MicroSwitch-SD-E is an open source PCB design by JuergenLeber, published on GitHub. It is a 2-layer board measuring 7.7 × 10 mm, with 4 components from 4 distinct parts.

Other key parts include the A3144. By type, the board carries 1 IC, 1 transistor, 1 connector and 1 resistor.

It belongs with the sensors designs in this gallery.

From the project

Replacement for Micro Switch Hall sensor E series with three terminals

A drop-in replacement for the failed Hall effect sensors in Honeywell/Micro Switch SD series keyboard switches of the three-terminal "type E" variety — the ones stamped 4A3E on the housing.

Micro Switch SD series switches are Hall effect keyswitches: a magnet rides on the plunger, and a small sensor substrate at the bottom of the switch reads its position. There are no contacts to wear out, but the sensors themselves do die — and since they are bare substrates with the Hall element potted in resin, they cannot be repaired, only replaced. Working donors are getting hard to find.

MicroSwitch-SD-E, from the project README
From the project README

Main components on the MicroSwitch-SD-E

A3144

MicroSwitch-SD-E bill of materials (BOM)

4 components, 4 distinct parts.

QtyPartRefs
1
A3144
U1
1
BSS84
Q1
1
Conn_01x03_Pin
J1
1
11k
R1

MicroSwitch-SD-E design files

The KiCad project lives in the JuergenLeber/MicroSwitch-SD-E repository on GitHub; these links point at the commit this page was built from.

MicroSwitch-SD-E: common questions

How big is the MicroSwitch-SD-E PCB?

The MicroSwitch-SD-E measures 7.7 × 10 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the MicroSwitch-SD-E?

4 components, from 4 distinct parts. The full bill of materials is listed on this page.

Where can I download the MicroSwitch-SD-E design files?

From the JuergenLeber/MicroSwitch-SD-E repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the MicroSwitch-SD-E design in my own project?

The repository has no license, so all rights stay with JuergenLeber. Use it as a reference, and ask the author before reusing the design.

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