On Fri, 24 Feb 2012 01:18:02 +0100, Fred Bartoli " " wrote:
Jim Thompson a écrit :
Attached is what I had in mind using opto-couplers to set and reset a
simple flip-flop.
The advantage is that the 100K load on the opto-coupler is slow in the
_rising_ direction, but falls fast, thus doesn't impair performance.
...Jim Thompson
What about that 100us delay at the falling edge ;-)
111us ;-)
It should be symmetric. I suspect it's just a simulation runtime
issue until the "lead" capacitor reaches equilibrium, since, without
the capacitor, it's symmetric at 278us delay on both edges. (I
"tuned" to the first edge... something I would not normally do, as
it's not good engineering practice.)
My multi-component version, which thoroughly "whacks" the opto-coupler
at the zero-crossing, does ~2us on both edges, come hell or high
water, but it offended his majesty.... so he's off sucking his thumb
in the corner trying to think of other phrases of denigration besides
"hag" and "geezer" :-)
...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at
http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.