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Techmoan video, tape cleaning machine. Seems to have a lot of 74xx chips.
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Ed.Kloonk:
@2:50

Seems to be more chips than needed for the functions it has. What do you think?




filssavi:
My guess is that the auto rewind functions pre and post cleaning are implemented in digital logic (either FSM or specific timing logic). Probably that implementation is a lot cheaper (and more reliable) than an electromechanical one (no rubber belts to rot, felt to dry up and crumple away, plastic gears to strip, etc)
newbrain:

--- Quote from: filssavi on July 25, 2020, 12:37:29 pm ---My guess is that the auto rewind functions pre and post cleaning are implemented in digital logic (either FSM or specific timing logic). Probably that implementation is a lot cheaper (and more reliable) than an electromechanical one (no rubber belts to rot, felt to dry up and crumple away, plastic gears to strip, etc)

--- End quote ---
I second the idea of a small FSM: we see 7400, 74107and 74123, going from memory, they are NAND gates, flip-flops (JK?) and a monostable.
So, more or less what you need to have some states and temporization.
eti:
Seems logical. ;)
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