Hi! I did a lot of TTL logic back in the nineties but now I am lost.
Need a circuit that can trigger a relay when movement or stop is detected on a axle.
My approach is that the relay should stay active as long as the axle is turning. So, I decided to have the axle generate a pulse train.
Next I need a timer that triggers on positive flank and then turns off the output after maybe half a second. If there is a new positive flank during this time the timer will restart. The reason I want it this way is that the axle might stop on a positive flank and not indicating a stop. As long as the axle is spinning the relay will stay active.
Any ideas?
Also: Once upon a time there was a TTL logics datablade book. Is such documentation still available?
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