> On Jun 20, 2019, at 4:42 PM, Bill Stanley <[email protected]> wrote: > > Jeff; For my clock line time base, I decided on a brute force filter. I use a > opto-isolator powered by the rectified AC line with the assumption that any > noise would need enough energy to light an LED via a large resistor to get > thru. Not impossible but a fairly high bar. Since that signal does go to a > counter/timer, I could create a software one-shot to add a bit more > protection, I will think about that (and there goes 5% more overrun on code)
Have you tried using a ZCD (zero-crossing detector) opto-coupler followed by a Schmitt trigger? I built a thyristor-based variable light controller that way years ago and it worked perfectly. Terry Bowman, KA4HJH "The Mac Doctor" -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/17CFADC0-A0F8-43A3-9B3B-335532F65FC9%40gmail.com. For more options, visit https://groups.google.com/d/optout.
