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ClemensValens
ClemensValens 6 hours ago
Thanks for this excellent comment, very useful indeed. I didn't really have mass production in mind when I did this. Does your website has a URL by any chance?
Rotary encoder(s) on a single MCU pin
DwayneR
DwayneR 8 hours ago
Klaus - observe what happens when only one channel of your design has a LED connected.  All of the other channels are loading down the output of the op-amp because each of the other output transistors Vbe juction is forward biased. The solution is simple - simply add an emitter-follower to the output of the op-amp.  Make sure you take your op-amp feedback from the emitter of the added transistor. I used exactly the same approach you are using many decades ago - it works well so long as the loading caused by the un-used channels doesn't affect the common base drive voltage.
10-fold LED constant current source Variable.
engineer
engineer 11 hours ago
This idea appears to be nice and I published this on my website too a decade ago. I even used this in industrial projects of my customers already. Practically you will come across some issues: Contacts will change their resistance of the time and together with the variation of the resitor values during the production process, adjustment and trimming is required to operate the digital switching correctly to be fast enough. For mass production a learning function of a software algorithm was intruduced to perform this. But though glitch handling and capacity effects cause a significant time delay before values are stable which make it hard to detect fast switching activity. For high resolution eoncoder with more than 15 steps and fast movement, there are many overlooked values which will require additional intelligence in the controller to handle this. Summarizing this is a method for a small number of cases only and the common method of latching the data into serial shift registers should be prefered.  
Rotary encoder(s) on a single MCU pin
cbrose
cbrose 14 hours ago
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cbrose
cbrose 14 hours ago
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