RE: Zero Crossing Question

...@majordomo.ieee.org Subject:RE: Zero Crossing Question Zero Crossing QuestionJohn, I think you already have the answer to the problem. You stated that Harris or Intersil IC's work properly regardless of the mains polarity. Some years back I had an issue where another manufacturer's replacement

RE: Zero Crossing Question

John, Or another example where different companies' equivalent parts are not equivalent-- this is one that I ran into in 1977. I had designed a Power-On-Reset (POR) circuit using a 555 timer, and had tested the circuit on a solderless breadboard. I was being sneaky in my design, and used the

RE: Zero Crossing Question

Hi Folks Could this ON Semiconductors problem be something to do with: a) The fact that the neutral is generally not at ground potential, but has floated up due the current flowing in it? or b) The actual PSU has a filtering arrangement that is non-symmetrical wrt true ground?

RE: Zero Crossing Question

Zero Crossing QuestionJohn, I think you already have the answer to the problem. You stated that Harris or Intersil IC's work properly regardless of the mains polarity. Some years back I had an issue where another manufacturer's replacement was substituted for a Sprague ULN2003 Darlington Array