General > General Technical Chat
One More Mystery Board
Ookpik:
Does anyone know what kind of device this board is from?
The board has the Texas Instruments logo and appears to be from the 1960's.
Any help would be greatly appreciated! :)
bob91343:
Looks like a zener regulator board. Input to the power resistor, output on the 3 zeners in series and a bypass capacitor.
ChristofferB:
Probably part of a card cage with multiple pcbs with the same connector on a back plane. The test points on the edge and the angled corners and corner lifting holes support this.
rsjsouza:
--- Quote from: bob91343 on June 25, 2021, 01:02:28 am ---Looks like a zener regulator board. Input to the power resistor, output on the 3 zeners in series and a bypass capacitor.
--- End quote ---
Indeed. The color coding should match the Zener's part number: 1N845? (grey-yellow-green? I can't figure that out from the photos).
It could serve any purpose, but it is surely part of a larger backplane or test jig of sorts with the large connector. The size and type of PCB material hint to me it is late 1960s at the earliest.
amyk:
Related: https://ingeniumcanada.org/ingenium/collection-research/collection-item.php?id=1972.1357.001
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