| Electronics > Projects, Designs, and Technical Stuff |
| Comparing an Alps rotary encoder to chinese rip-off |
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| SiliconWizard:
--- Quote from: Jan Audio on May 28, 2020, 02:56:19 pm ---What do you mean ?, without resistor the encoder will wear out faster ? I dont see how. --- End quote --- Without a series resistor to the cap, the cap will discharge directly through the contacts each time they are closed. Given the small ESR of a typical ceramic cap, that's a lot of current. |
| madires:
A few years ago I bought a bunch of the cheapest rotary encoders from China I could find as a worst case to check some firmware code. I had to tweak some minor details but I made all work without any hardware filtering. No filter caps allowed because the encoder's A and B lines may be shared with a display. Most of those encoders are ok-ish, but some create nasty glitches. The algorithm I use tracks the A and B signals and checks if they follow the Gray code. If there's any problem the last step is ignored and the algorithm starts again with the next one. When the encoder creates a glitch the user simply has to turn a little bit more until the algorithm sees the correct Gray code sequence. Anyhow, I also prefer ALPS' rotary encoders - no problems at all. |
| Yansi:
What do you think happens with the delicate contact surfaces, if they repeatedly short out a 100nF cap charged to 5V or what? |
| Jan Audio:
I dont know, i.m learning, thank you all. What i was thinking : the power goes thru, nothing else, wearing comes from the mechanical rotating i was thinking. So suppose you have a ribbon cable, it is very thin, can it also wear from energy ?, is it not the same ? |
| BreakingOhmsLaw:
Remember the good old day, when a proper switch had a drop of mercury in it? Razor-sharp edges, no bouncing. Did any company ever try to replace the mercury with Galinstan alloy? |
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