On Mon, 12 Mar 2012 18:18:29 -0500, John Fields
wrote:

On Mon, 12 Mar 2012 09:17:09 -0700, John Larkin
wrote:

On Mon, 12 Mar 2012 10:54:35 -0500, John Fields
wrote:

On Mon, 12 Mar 2012 08:26:44 -0700, John Larkin
wrote:

On Mon, 12 Mar 2012 10:03:56 -0500, John Fields
wrote:

On Mon, 12 Mar 2012 07:22:12 -0700, John Larkin
wrote:


Build your circuit and hook it up to an infinite-persistance digital
scope. It will screw up on the order of once an hour.

---
That task doesn't fall on me, it falls on you since you're the one who
wants to prove me wrong.

It's a simple circuit and, if you don't make too many wiring mistakes,
should be up and running quickly.

You'll let us know how it goes, yes?



It's an ugly hairball, full of hazards, and you're an amateur. There's
no point in demonstrating the obvious.

---
If it's so obvious you should have been able to prove me wrong by now
but, instead, you've taken a couple of pratfalls yourself and are
afraid to build and test the circuit for fear that it'll vindicate my
approach and prove you wrong once again.

So, instead of taking the high road and practicing what you preach,
you revert to name-calling.

Typical Larkinese side-step.
---

I already have a much better, 3-part ZCD circuit that works without hazards.

---
Let's see a sim.

It's been posted, in a couple of variants, in s.e.d.

---
Maybe I missed something, but I didn't see part numbers or even an
attempt at a finished design, from you, which would satisfy the OP's
requirements for a zero-crossing signal varying less than about +/- 2%
from the actual zero crossing, with mains frequencies of 50 and 60Hz
and voltages of either 120 or 240 VRMS.

You missed something.


--

John Larkin, President
Highland Technology, Inc

jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation