Folks, follow up to the items in the Mtg itad thread.
Well, unless the opto couplers are drawing a lot of current, I think the debounce is complete with the 330uf caps! 
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GRJ, Lol good point on the caps. I should have added 'if required' to "in the software".
What is the optoisolator you show in your schematic?
Note that if the purpose of the bridge-rectifier is AC-to-DC conversion at signal levels/currents (as opposed to power levels/currents) you might consider replacing the bridge rectifier with an AC-input optocoupler. "
Stan, the optoisolator place holder in the schematic is a prefab 2 channel board of which I have 4 or 5 on hand. When designing my board I simply placed two 4-Pin female headers the proper distance apart so the prefab (male pins) drop in for easy replacement. Looks like the chip on the board is D216. Yes, my intent is to provide a 5v signal level output to an Arduino Mega 2560 Pro Mini.
I've successfully used the LTV-8x4 series optocouplers with track level AC inputs behind a current limiting resistor: https://optoelectronics.liteon...0series%20201509.pdf"
Separately, I think you're dodging a bullet when you tie together the 2 bridge rectifiers as indicated above. A bridge rectifier does not provide electrical isolation. It is electrical isolation that "allows" you to tie together the grounds of different electrical circuits. You dodge the bullet in this case because your input resistor limit the current but if, for example, Track 1 and Track 2 AC power are out-of-phase, then the diode(s) in the bridge rectifier will electrical short the two tracks."
Stan, the layout's track is powered by two 180W bricks, tied to a single ZW-C and properly phased. But good catch and certainly gives me pause for thought.
bmoran4 and Stan, since reading your posts and investigating the LTV-8x4 chip I'm leaning toward that approach. Never opposed to building a better mousetrap. FWIW, I did try to investigate AC optocouplers but all I could ever find were industrial grade (too large and/or too pricey). These LTV-8x4 chips seem to be spot on for this application. Any thoughts on the current limiting resistors?
Thanks for all the input so far!
Barry
