Electronics > Projects, Designs, and Technical Stuff
Comparing an Alps rotary encoder to chinese rip-off
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BreakingOhmsLaw:
Just a quick look at a comparison between a genuine Alps STEC11B13 versus a chinese rip-off.
Results as expected:

We'll start with just a 10k pullup:
Alps:

Won-Hung-Lo:

Wow...just..wow.. :palm:

Can that be cleaned with 100nF to ground?
Alps (just for comparison)

Won-Hung-Lo:

That noise is still above the "high" threshold of most MCUs. Sure, you could fix that with more parts, but jeeez, why would you want to?
ataradov:
I appreciate the existence of both. Sometimes price is important and I'm willing to sacrifice some performance for that.

Also, your case seems to be extreme. There is typically some bounce, but not that much. So picking the right cheap option is also important.

That is for new designs. If you are fixing something that was not originally designed to accept the noisier version, obviously replace with the real deal.
BreakingOhmsLaw:
Yes, this was a random pick from FleaBay. I got a bunch of these and they are all more or less the same, with a single one that is slightly better. This batch is practically unusable and i trashed it.
I like to have a cheap option too, that's why i do these benchmarks.
Just had to post this one for its spectacular fail, can't remember having seen such bad bouncing in 25 years of engineering. That thing is practically generating RF  :-DD 
james_s:
I'd be curious how they compare after both have had a few thousand cycles. I've had some good name brand encoders get really nasty with age, so it may not be a bad idea to use one of the cheap ones for development in order to get the software handling robust enough to tolerate the degredation.
ebclr:
You forgot to compare the price  :-DD
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