[TriEmbed] Question concerning a mechanical release

[Rodney Radford]

I will also have to chime in to agree with John about the the comments on
opto isolators.  Digital opto-isolators are available in speeds in the 10+
Mbd (megabaud), and analog opto-isolators can be used to transfer isolated
analog voltages.  They have voltage isolation in the 10kv+ range.

I have never heard of a mis-trigger on an opto-isolator, nor noisy PWM (as
long as you choose an opto-isolator whose speed exceeds the speed of the
PWM).

While there are other options available, opto-isolators continue to be used
widely in old and new designs and are very cheap.  If you have had bad
experiences with an opto-isolator, it may have been the design, or a bad
part - not indicative of the part as a whole.



On Fri, Sep 27, 2013 at 8:55 AM, John Vaughters <jvaughters04 at yahoo.com>wrote:

> I'm going to disagree with sing opto-isolators.  They are slow
> (non-squarewave forming, but very rounded waves) and very noisy
> (interference with PWM signals, and mis-triggers for other I/O).
>
>
> Scott,
>
> I appreciate the feedback. I admit that my methods may be old and I am
> always looking for some newer techniques, I look forward to reviewing this
> solution you mentioned. I have been using the opto-isolators for over a
> decade and will state they work quite well without any significant noise or
> mis-triggers, but I do not use them in high frequency at all, so I just may
> not have seen those limitations.
>
> This is why I love these forums, everyone has a different approach and we
> can all learn.
>
> Thanks,
>
> John Vaughters
>
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