Here's a reference circuit from a clock chip supplier:
http://www.maxim-ic.com/appnotes.cfm/an_pk/1994
You can be pretty sure that the edge shaping and noise rejection is built inside the chip.
Hi,
The above referenced part is nice. It has back-to-back LEDs, however, so it will turn on twice per cycle, equivalent to a full-wave rectifier. One LED for the positive half-cycle, the other LED for the negative, or 100 Hz for 50 Hz main AC. It also directly exposes the LEDs on the input...
Sorry, the tinyURL doesn't work.
The link was to the Opto 22 Part ODC5. Everyone seems to use this name, so just GOOGLE "dc output module" for lots of results.
Hi,
I've been lurking but felt compelled to chime in. Since you said this is an output for monitoring an alarm & shut-down conditions (safety related) I strongly agree with the //conservative// design guidance, particularly from Biff. Of course it all depends on the specs of the DAQ. I...
