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Micro Switch 8SW3-2

This is an unidentified 8-key panel with switches that are most likely 1SW11 (source level, sloped), manufactured in week 37 1978. The switches are not wired in a matrix: the VCC and GND traces are shared, but the outputs are all isolated. Curiously there is no edge connector: the connecting leads have to be soldered separately.

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Front
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Back, with 8SW3-2 model label
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7837 date code
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Stamped numbers 1814 and 1815 on different units, possibly serial numbers
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PCB, with separate solder points for each switch output
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“C”-type (source level) Hall sensors
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Hall sensor detail
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Voltage curve, operating
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Voltage curve, release

These photographs were taken by fricked keyboards and have been placed into the public domain (CC0).