Another TEClite display, this one bought just because it looked like it would be cool - and it is! Really a piece of beautiful design from a time when reliability and ruggedness really mattered. Enjoy!
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the vacume sealed magnetic reed switches are also explosion safe, and can be used in environments with volatile gasses present!!
Agreed that the sealed magnetic reed switches promise extra-long life expectancy. And the mechanical design is just short of elegant. However, those incandescent lamps really negate the expectation of long functional lifetime. And their deep internal location and soldered-in deployment make for a very repair-hostile product. PROUD PATREON SUPPORTER OF FRAN LAB
🤔 21 contacts on the connector. Maybe 16 for the lights. Then 4 bits for the switches. And one for ground? To encode the switches into bits i expect some traces on the back…
magnetic reed switches
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Take a close look at the PCB. That circuit trace that connects together many resistor ends needs to be insulated from the traces going to the edge connector. There were many ways companies used to make multi layer PCBs.
What's under the solid yellow buttons ? 🤔🥰
That's lovely! I kind of want to make one now. 😀
Fran explores all those old lighted indicator technologies used before LEDs made it trivially easy.
I noticed that each lamp lens had a tiny Fresnel lens inside to better direct the light from the bulb in a forward direction, and probably to even out the tendency to have a hot spot of light.
what does it smell like?
Love the curvy traces. And so precise, it makes me wonder if they really were hand-taped or drafted using French curves.
Those reed switches looked very neat all lined up like that, the whole assembly looked like it was made to last.
I once had a nixie tube calculator that had reed switches for all the buttons, it lasted since the early sixties up until it exploded in the late nineties because of being left plugged in and switched on for a fortnight whilst I was on holiday, and it wasn't even me that had used it last and left it powered on.
But I was a youngster then so it had to come apart ofcourse.
Thank you, Fran! I would have liked to see them glowing or dimming, those beautiful little lamps. 😮
That is a really neat switch! Thanks Fran!
I suspect the yellow switches might reset the byte so that you can enter a different value.